Journal articles: 'Total hormonic distortion(THD)'

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Refdinal, Nazir, Syafii, Pawawoi Andi, Akbar Fajril, and Dorinza Axel. "Differences in the impact of harmonic distortion due to the installation of electronic load controller in self-excited induction generator and synchronous generator." International Journal of Power Electronics and Drive System (IJPEDS) 10, no. 1 (2019): 104–16. https://doi.org/10.11591/ijpeds.v10.i1.pp104-116.

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In general, the application of Self-Excited Induction Generator (SEIG) or Synchronous Generator (SG) on the Stand-Alone Micro Hydel Power Plant (MHPP) is equipped with Electronic Load Controller (ELC) to control generator output during variations in consumer load. One type of ELC that is cheap and rigid developed today is the ELC, which is constructed by the uncontrolled bridge rectifier with DC Chopper. Based on the operational concept, basically this type of ELC can be implemented on both SEIG and SG, but both of these generators will have a different harmonic distortion effect on the output and its load. This paper examines the differences in the effects of harmonic distortions due to ELC installation on SEIG and SG. The initial stage of this study was to design the ELC developed. Then, the harmonic distortion response due to the installation of ELC on SEIG and SG is tested, which includes harmonic distortion in: stator current, PCC voltage, and consumer load current. THDI (Current Total Harmonic Distortion) stator current at SEIG with ELC has shown an average value smaller than the THD stator current in SG with ELC. Likewise, the THDV (Voltage Total Harmonic Distortion) value of PCC voltage and THDI value of the current consumer load on SEIG equipped with ELC has been shown to be smaller than the THDV value of PCC voltage and THDI value of the current consumer load on SG equipped with ELC. The effects of harmonic distortions due to the installation of ELCs that developed in this study on SEIG is still within the permitted limits, while on the SG, the harmonic distortion reduction is needed at the generator output.

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Al jewari, Maher Abd Ibrahim, Auzani Jidin, Siti Azura Ahmad Tarusan, and Mohammed Rasheed. "Implementation of SVM for five-level cascaded H-Bridge multilevel inverters utilizing FPGA." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 3 (2020): 1132. http://dx.doi.org/10.11591/ijpeds.v11.i3.pp1132-1144.

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The Space Vector Modulation SVM technique has won large acceptance for AC drive applications. However the utilization of multilevel inverters connected with SVM by Digital signal processor (DSP) raise the intricacy of control algorithm or computational load, increases of the obtaining distortions output voltage. The development of SVM in multilevel inverters may offer higher numbers of switching vectors for acquiring further enhancements of output voltage performances and implement by using Field Programmer Gate Array (FPGA), investigate lower Total Hormonic Distortion (THD). This paper reports the performance evaluation of SVM for five-level of Cascaded H-Bridge Multilevel Inverter CHMI using MATLAB/Simulink, which is sampled at the minimum sampling time, i.e. DT = 5 μs. The switching signals for driving insulated gate bipolar transistor (IGBTs) which are stored in MATLAB workspaces, are then used to be programmed in FPGA using a Quartus II software. Which can be stated the lower THD of the simulation result is about 14.48% for five-level CHMI and experiment result is about 14.31% for five-level CHMI at modulation index M_i=0.9. The error percentage between the simulation results and experimental results of the fundamental output voltage in SVM is small which is approximately less than 1 %.

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Maher, Abd Ibrahim Al-jewari, Jidin Auzani, Azura Ahmad Tarusan Siti, and Rasheed Mohammed. "Implementation of SVM for five-level cascaded H-bridge multilevel inverters utilizing FPGA." International Journal of Power Electronics and Drive System (IJPEDS) 11, no. 3 (2020): 1132–44. https://doi.org/10.11591/ijpeds.v11.i3.pp1132-1144.

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The Space Vector Modulation SVM technique has won large acceptance for AC drive applications. However the utilization of multilevel inverters connected with SVM by Digital signal processor (DSP) raise the intricacy of control algorithm or computational load, increases of the obtaining distortions output voltage. The development of SVM in multilevel inverters may offer higher numbers of switching vectors for acquiring further enhancements of output voltage performances and implement by using Field Programmer Gate Array (FPGA), investigate lower Total Hormonic Distortion (THD). This paper reports the performance evaluation of SVM for five-level of Cascaded H-Bridge Multilevel Inverter CHMI using MATLAB/Simulink, which is sampled at the minimum sampling time, i.e. DT = 5 μs. The switching signals for driving insulated gate bipolar transistor (IGBTs) which are stored in MATLAB workspaces, are then used to be programmed in FPGA using a Quartus II software. Which can be stated the lower THD of the simulation result is about 14.48% for five-level CHMI and experiment result is about 14.31% for five-level CHMI at modulation index M_i=0.9. The error percentage between the simulation results and experimental results of the fundamental output voltage in SVM is small which is approximately less than 1 %.

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Nik, Fasdi Nik Ismail, Hashim Norazlan, and Johari Dalina. "A comparative study of cascade h-bridge multilevel voltage source inverter and parallel inductor multilevel current source inverter." International Journal of Power Electronics and Drive System (IJPEDS) 10, no. 3 (2019): 1355–63. https://doi.org/10.11591/ijpeds.v10.i3.pp1355-1363.

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This paper presents the analysis study between multilevel inverters that are often classified into multilevel voltage source and multilevel current source inverters. For multilevel voltage source inverter (MVSI), the specific topology studied for this work is the Cascaded H-Bridge MVSI. Whereas, the multilevel current source inverter (MCSI) is based on Paralleled Inductor Configuration MCSI. For this study, the analysis between these converters are done with respect to the number of components, the advantages and disadvantages of each converters during performing inverter operation. In term of output voltage and current quality, the percentage of the Total Harmonic Distortion (THD) are measured and compared for both topologies. MATLAB/Simulink software has been used in this research to design and simulate in order to study the performances of both inverters.

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Ali Mashar and Dja’far Sodiq. "TEKNIK MITIGASI HARMONISA MENGGUNAKAN LINE REACTOR." Jurnal Teknik Energi 6, no. 2 (2020): 455–63. http://dx.doi.org/10.35313/energi.v6i2.1732.

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    Sistem Pembangkit Listrik Tenaga Mikro Hidro (PLTMH) yang dibangun di Indonesia pada umumnya menggunakan Electronic Load Control (ELC) untuk mengatur daya dummy load (ballast) sesuai dengan perubahan daya yang diserap konsumen guna mempertahankan frekuensi. ELC dalam mengatur daya ke ballast tersebut dilakukan melalui rekayasa sinyal yang menggunakan Triac (transistor ac). Penerapan ELC inilah yang kemudian mengakibatkan timbulnya harmonisa yang sangat tinggi yang diukur dalam Total Harmonic Distortion (THD) di PLTMH sehingga mengganggu peralatan yang menggunakan daya listrik dari pembangkit tersebut seperti: peralatan komunikasi (audio visual) dan peralatan kontrol dan proteksi. Pada penelitian ini dikaji teknik mengatasi masalah hormonisa tersebut dengan menggunakan Line Reactor untuk memitigasinya. Untuk mendapatkan hasil yang baik line reactor harus dirancang sesuai dengan karakteristik harmonisa dan generator yang digunakan. Oleh karena itu, pada paper ini juga dibahas tentang perancangan line reactor dan pemasangannya pada sistem PLTMH. Untuk mengetahui sejauh mana efektivitas line reactor dilakukan pengujian dan analisis unjuk kerjanya. Berdasarkan hasil pengujian diperoleh hasil bahwa line reactor yang dirancang cukup efektif mengatasi masalah tersebut, yaitu mampu menurunkan harmonisa sampai dengan 35'% walaupun ada konsekuensi penurunan tegangan jaringan.   

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Prasetijo, Hari, Priswanto Priswanto, Widhiatmoko H.P., and Irunowo Irunowo. "Analisa Pemasangan Filter Pasif Sebagai Peredam Harmonisa Akibat Beban Non Linier." JRST (Jurnal Riset Sains dan Teknologi) 7, no. 1 (2023): 109. http://dx.doi.org/10.30595/jrst.v7i1.16677.

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Studi ini bertujuan menganalisa dampak pemasangan filter pasif pada beban listrik yaitu salah satu konsumen 3 phase PT. PLN. Variabel yang diamati adalah total harmonic distortion (THD) arus, THD tegangan, faktor daya dan putaran kwh meter elektromekanik. Metode yang digunakan adalah pengukuran total harmonic distortion (THD) pada beban listrik 3 phase dilakukan menggunakan spectrum analyzer, perancangan filter pasif single tuned untuk THD arus tertinggi, simulasi menggunakan aplikasi Mathlab dan Analisa. Data yang diperoleh arus orde 3 memiliki distorsi paling tinggi, yaitu THD arus total sebesar 15,05% dan THD tegangan total sebesar 9,39%. Hasil pemasangan filter pasif orde 3 yang dilakukan secara simulasi menurunkan THD arus total menjadi 10,40%, THD tegangan total menjadi 6,61%, peningkatan faktor daya dari 0,971 menjadi 0,985 serta penurunan putaran kwh meter elektromekanik sebesar 36 putaran per jam.

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Surapati, Alex, Martin Panggabean, and Muhammad Khairul Amri Rosa. "Pengaruh Total Harmonic Distortion (THD) Terhadap Pembacaan kWh Meter Semi Digital." JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER 12, no. 1 (2022): 25–33. http://dx.doi.org/10.33369/jamplifier.v12i1.21460.

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AbstrakEnergy measurement using a kWh meter must have good accuracy. The increasing use of non-linear electrical equipment causes harmonics in the network. This study aims to measure and analyze voltage, current, power, power factor and the percentage of Total Harmonic Distortion (THD). The research was carried out by designing and making a device in the form of an electrical circuit connected to a semi-digital kWh meter with a fixed load of 10 incandescent lamps with a power of 100 watts each and 1 single-phase induction motor. The test results show that the incandescent lamp load test produces a THD-I percentage of 3.5% and a THD-V percentage of 3.7% with a measurement error value of 0.675%. In the motor load test, the percentage of current harmonics becomes high at 16.6% and the THD-V percentage is 3.4% and the measurement error value is 3.48%. In testing the variation of the load combination of an induction motor and incandescent lamps, the percentage of THD-I is 5.8% and the percentage of THD-V is 3.2% with an error value of 3.57%. The greater the THD percentage value, the greater the reading error on the semi-digital kWh meter and the worse the resulting power factor value. Kata kunci: Non-linear load, kWh Meter, THD

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Nurhazwani, Anang, and Mariam Wan Muda Wan. "Analysis of total harmonic distortion in single-phase single-stage grid-connected photovoltaic system." International Journal of Power Electronics and Drive Systems 14, no. 01 (2023): 471~479. https://doi.org/10.11591/ijpeds.v14.i1.pp471-479.

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This study presents the power quality issue mainly focus the effect of total harmonic distortion (THD) on a grid-connected PV system. Firstly, a gridconnected PV system with a single-phase single-stage has been developed to monitor the output values of voltage and current and also its harmonic distortion behaviours. Maximum power point tracking (MPPT) was implemented since it is proven as the first step for THD reduction because MPPT will extract maximum output power, voltage, and current of the PV system without fluctuation which leads to a low THD level. Furthermore, the employment of a good filter also reduces the THD level in a PV system. Thus, this study will focus on the THD analysis to resolve the power quality problems in the grid-connected PV system. The result shows that the THD value for current, ITHD analysis is more significant than the THD value for voltage, VTHD analysis in the case of grid-connected PV systems operating under different solar irradiances. In a conclusion, the increase in solar irradiance will increase the rated values of generated power and current thus, increasing the performance of THD values.

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Zhang, Shaoru, Huixian Li, Yang Liu, et al. "An Improved SPWM Strategy for Effectively Reducing Total Harmonic Distortion." Electronics 13, no. 16 (2024): 3326. http://dx.doi.org/10.3390/electronics13163326.

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In the inverter circuit, the speed at which the MOSFET is impacted by the presence of a parasitic inductor within the printed circuit board (PCB) leads to a delay in the switching process. Furthermore, the parasitic inductor within the circuit can easily form an LC oscillation with the parasitic capacitor of the MOSFET. These two issues result in an inconsistency between the actual output of the MOSFET and the driving signal waveform, leading to distortion in the sinusoidal pulse width modulation (SPWM) waveform and an increase in total harmonic distortion (THD). It is a common practice to mitigate gate oscillation by introducing a resistor at the gate of the MOSFET. However, elevating the resistance leads to deceleration in the charging process of the MOSFET’s parasitic capacitor, consequently causing an increase in the switching delay, and thereby increasing THD. Therefore, an effective strategy to reduce THD is proposed in this paper, while augmenting the gate resistance, computing the MOSFET switching delay, and applying corrective compensation. In this way, the inherent issues of the switch are addressed, resulting in inverter output waveforms that closely resemble sine waves and reduced THD. Through a combination of simulation and empirical experimentation, the efficacy of the proposed approach in significantly reducing THD in the inverter’s output waveform has been empirically substantiated.

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Budi Aryawan, I. Putu, Antonius Ibi Weking, and I. Wayan Rinas. "ANALISIS PEMASANGAN FILTER PASIF DAN AKTIF TERHADAP KANDUNGAN HARMONISA DAN RUGI-RUGI DAYA GARDU DISTRIBUSI KA 2085 DI PT. PLN (Persero) DISTRIBUSI BALI RAYON MENGWI." Jurnal SPEKTRUM 5, no. 1 (2018): 41. http://dx.doi.org/10.24843/spektrum.2018.v05.i01.p06.

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Operation of nonlinear loads can cause harmonic distortion in the voltage and current waveforms that result in abnormal electrical system condition. Content THD (Total Harmonics Distortion) an excess flow can cause power quality systems become worse, thus causing the system power factor is lower. Active filter and Passive filter which aims to reduce harmonics that arise. Analysis THD simulation and measurement results in accordance with IEEE 519-2014 and analysis designing of a passive filter and active filter is right to suppress harmonic distortion. The analysis shows that the installation of active filters causes the current and voltage THD contents to comply with the standard IEEE 519-2014 standards is ?12% and 5%. The use of passive and active filters can reduce THDi content to 8.45% and 3.07%, respectively. While for THDv decreased respectively to 3.68% and 3.45% which already meet the IEEE 519-2014 standards. Power losses decreased respectively to 4.36 kW and 3.86 kW. Installation of active filters is better for reducing THD (Total Harmonics Distortion) and power losses in KA 2085 transformers.

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Anang, Nurhazwani, and Wan Mariam Wan Muda. "Analysis of total harmonic distortion in single-phase single-stage grid-connected photovoltaic system." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 1 (2023): 471. http://dx.doi.org/10.11591/ijpeds.v14.i1.pp471-479.

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This study presents the power quality issue mainly focus the effect of total harmonic distortion (THD) on a grid-connected PV system. Firstly, a grid-connected PV system with a single-phase single-stage has been developed to monitor the output values of voltage and current and also its harmonic distortion behaviours. Maximum power point tracking (MPPT) was implemented since it is proven as the first step for THD reduction because MPPT will extract maximum output power, voltage, and current of the PV system without fluctuation which leads to a low THD level. Furthermore, the employment of a good filter also reduces the THD level in a PV system. Thus, this study will focus on the THD analysis to resolve the power quality problems in the grid-connected PV system. The result shows that the THD value for current, ITHD analysis is more significant than the THD value for voltage, VTHD analysis in the case of grid-connected PV systems operating under different solar irradiances. In a conclusion, the increase in solar irradiance will increase the rated values of generated power and current thus, increasing the performance of THD values.

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Yatim, M. H., A. Ponniran, and A. N. Kasiran. "Multilevel inverter with MPWM-LFT switching strategy for voltage THD minimization." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 3 (2019): 1461. http://dx.doi.org/10.11591/ijpeds.v10.i3.pp1461-1468.

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This paper presents a proposed modified pulse width modulation – low frequency triangular (MPWM-LFT) switching strategy for minimization of voltage THD with implementation of asymmetric multilevel inverter (AMLI) topology on the reduced number of switching devices (RNSD) circuit structure. Principally, MPWM-LFT able to produce optimum angle of the output voltage level in order to minimize total harmonic distortion (THD). In this study, 5-level reduced number of switching devices circuit structure is selected as a circuit configuration for asymmetric (7-level structure) multilevel inverter. For switching strategy, MPWM used low switching frequency in producing signal and needs higher output voltage levels to achieve low total harmonic distortion. In contrast, sinusoidal pulse width modulation used high switching frequency in order to minimize total harmonic distortion. By optimizing angle at the output voltage using MPWM-LFT switching strategy, the voltage THD is lower as compared to MPWM and SPWM switching strategies. MPWM-LFT switching strategy obtains 11.6% of voltage THD for the 7-level asymmetric topology as compared to MPWM and SPWM switching strategies with the voltage THD are 21.5% and 17.5% respectively from the experimental works.

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M., H. Yatim, Ponniran A., and N. Kasiran A. "Multilevel inverter with MPWM-LFT switching strategy for voltage THD minimization." International Journal of Power Electronics and Drive System (IJPEDS) 10, no. 3 (2019): 1461–68. https://doi.org/10.11591/ijpeds.v10.i3.pp1461-1468.

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This paper presents a proposed modified pulse width modulation – low frequency triangular (MPWM-LFT) switching strategy for minimization of voltage THD with implementation of asymmetric multilevel inverter (AMLI) topology on the reduced number of switching devices (RNSD) circuit structure. Principally, MPWM-LFT able to produce optimum angle of the output voltage level in order to minimize total harmonic distortion (THD). In this study, 5-level reduced number of switching devices circuit structure is selected as a circuit configuration for asymmetric (7-level structure) multilevel inverter. For switching strategy, MPWM used low switching frequency in producing signal and needs higher output voltage levels to achieve low total harmonic distortion. In contrast, sinusoidal pulse width modulation used high switching frequency in order to minimize total harmonic distortion. By optimizing angle at the output voltage using MPWM-LFT switching strategy, the voltage THD is lower as compared to MPWM and SPWM switching strategies. MPWM-LFT switching strategy obtains 11.6% of voltage THD for the 7-level asymmetric topology as compared to MPWM and SPWM switching strategies with the voltage THD are 21.5% and 17.5% respectively from the experimental works.

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Alhaj Omar, Fuad, and Nihat Pamuk. "Analyzing Impacts of Amplitude Modulation Index on Performance Characteristics of Three-Phase Nine-Level Modular Multilevel Converters." Electronics 12, no. 19 (2023): 4114. http://dx.doi.org/10.3390/electronics12194114.

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Modular multilevel converters (MMCs) represent the forefront of power converter technology, with wide-ranging applications across diverse industries. Over recent decades, substantial research and development efforts have been dedicated to enhancing MMCs’ performance. A significant challenge in power conversion processes is the presence of total harmonic distortion (THD) in output waveforms, which can have adverse effects on electrical equipment. In response, extensive studies have been conducted to address THD-related challenges by refining the control and operation of MMCs. This study investigates the effect of the amplitude modulation index (Ma) on the total harmonic distortion (THD) in nine-level MMC output waves. For this, a standard three-phase and nine-level MMC model was built and simulated in MATLAB/ Simulink environment, and the Ma value was shifted between 0.1 and 1.5. The output current and voltage waves were analyzed, and the optimal limits for the Ma values yielding the lowest THD values were determined. The simulation outcomes reveal a crucial Ma range between 0.6 and 1.2, where THD is significantly minimized. Ma values below 0.6 introduce significant harmonic distortion in the voltage waves, while values surpassing 1.2 lead to appreciable harmonic distortion in the current wave. This study contributes valuable insights for engineers and researchers and aids in the refinement of MMC control strategies and the mitigation of THD-related challenges in power systems.

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Alhafadhi, Liqaa, Jiashen Teh, Ching-Ming Lai, and Mohamed Salem. "Predictive Adaptive Filter for Reducing Total Harmonics Distortion in PV Systems." Energies 13, no. 12 (2020): 3286. http://dx.doi.org/10.3390/en13123286.

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This paper presents a new method for reducing the total harmonic distortion (THD) of photovoltaic (PV) systems by using an adaptive filter based on a predictive model. Instead of reducing the produced THD at each stage of the PV system, a one-step process is implemented at the end stage. The connection topology of the adaptive filter is similar to normal active and passive filters. The main difference is its ability to adjust the filtering coefficients while others cannot. The proposed method is applied to a single-phase standalone PV system by adopting least mean square (LMS), normalized LMS (NLMS) and leaky LMS algorithms to verify the validity of the proposed method. Various values of filter length and step size are evaluated, and results indicate that the proposed method can reduce THD in the current signal of the PV system significantly by using all of the mentioned algorithms. Different step sizes and filter lengths directly influence the effectiveness of the THD reduction, with small step sizes and long filters being the most effective. Amongst the algorithms, NLMS reduces THD the most, and LMS reaches the peak current value the fastest.

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Alegria, Francisco C. "Precision of the Sinefitting-Based Total Harmonic Distortion Estimator." Metrology and Measurement Systems 23, no. 1 (2016): 37–46. http://dx.doi.org/10.1515/mms-2016-0003.

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Abstract An analytical expression for the standard deviation of Total Harmonic Distortion (THD) estimation is derived. It applies to the case where the estimator uses sine fitting. It is shown that, in common circumstances, it is inversely proportional to the actual value of THD, the signal-to-noise ratio and the square root of the number of samples. The proposed expression is validated both with numerical simulations and an experimental setup using a Monte Carlo procedure.

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Hasan, H. A., Riyadh Kamil Chillab, Ahmed K. Hannan, and Abdelrahman Farghly. "A modified circulating current suppression control based on MMC grid connected using NLM." International Journal of Power Electronics and Drive Systems (IJPEDS) 16, no. 2 (2025): 1051. https://doi.org/10.11591/ijpeds.v16.i2.pp1051-1060.

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High total harmonic distortion (THD) occurs when conventional circulating current suppression and modulation strategies fail to control arm circulating current in a modular multilevel converter (MMC) controlled by a virtual synchronous generator. This paper proposed a joint circulating current suppression technique that improves the proportional resonant controller's control mode and introduces the nearest level approach modulation (NLM) strategy for arm circulating current rectification. The MATLAB/Simulink program is used to conduct the simulations. The results show that: when the grid frequency does not fluctuate, the joint suppression strategy's arm current THD is 2.79%, 0.92% lower than the quasi-proportional resonant controller's (QPRC) THD; under primary frequency modulation, the suggested strategy's THD of the a-phase current is 1.75%, 1.03% lower than the QPRC's THD. Under typical operating conditions and with primary frequency management of the grid-type MMC, the results show that the proposed combined circulating current suppression technique may successfully lower total harmonic distortion (THD), eliminate bridge arm circulating current, and improve power quality.

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Vasanth, A. V. "Performance Evaluation of A T-Type Multilevel Inverter for Renewable Energy Applications." INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 09, no. 05 (2025): 1–9. https://doi.org/10.55041/ijsrem49001.

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ABSTRACT: The increasing demand for clean and efficient energy conversion in renewable energy systems has led to the adoption of multilevel inverters, which offers reduced harmonic distortion and improved efficiency. Among various topologies, the T-Type Multilevel Inverter (T-MLI) is gaining attention due to its lower switching losses, reduced component count, and enhanced power quality. However, challenges remain in optimizing its performance metrics, including efficiency, total harmonic distortion (THD), voltage stress, and grid synchronization. This study aims to evaluate the performance of the T-MLI in total harmonic distortion (THD) and assess its suitability for solar PV integration and compare its performance with NPC multilevel inverters to determine its effectiveness in reducing losses and improving energy efficiency in renewable systems. Key Words: T-MLI, NPC, THD, renewable energy, reduced component count.

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Abdulhassan, Khalid M., and Osama Yaseen Khudair Al-Atbee. "Improved modified a multi-level inverter with a minimum total harmonic distortion." Bulletin of Electrical Engineering and Informatics 11, no. 2 (2022): 672–80. http://dx.doi.org/10.11591/eei.v11i2.3466.

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Renewable energy sources are developed as a result of the increased demand for electrical power. The nature of the solar energy source is DC. The DC source for many applications needs to be converted to AC. The inverter is used to convert the power from DC to AC. Total harmonic distortion (THD) is a significant concern with inverters. Multi-level inverters are used to reduce the THD. The stair output voltage of the multi-level inverter not only reduces the THD but also reduces the switches' stresses, so a low voltage rating can be used for the switches. In this paper, a modified inverter topology is introduced in which the number of switches is reduced for the same number of output voltage levels, which leads to reducing the losses and the cost. To reduce the THD, different amplitudes for the carrier signals that control the switches in each level are suggested. Another method to reduce the THD by using different capacitor values across the input DC source is presented. The MATLAB/Simulink is used to show the validity of the suggested modified topology and the modifications.

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Khalid, M. Abdulhassan, and Yaseen Khudair Al-Atbee Osama. "Improved modified a multi-level inverter with a minimum total harmonic distortion." Bulletin of Electrical Engineering and Informatics 11, no. 2 (2022): 672–80. https://doi.org/10.11591/eei.v11i2.3466.

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Renewable energy sources are developed as a result of the increased demand for electrical power. The nature of the solar energy source is DC. The DC source for many applications needs to be converted to AC. The inverter is used to convert the power from DC to AC. Total harmonic distortion (THD) is a significant concern with inverters. Multi-level inverters are used to reduce the THD. The stair output voltage of the multi-level inverter not only reduces the THD but also reduces the switches' stresses, so a low voltage rating can be used for the switches. In this paper, a modified inverter topology is introduced in which the number of switches is reduced for the same number of output voltage levels, which leads to reducing the losses and the cost. To reduce the THD, different amplitudes for the carrier signals that control the switches in each level are suggested. Another method to reduce the THD by using different capacitor values across the input DC source is presented. The MATLAB/Simulink is used to show the validity of the suggested modified topology and the modifications.

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Nugroho, Tomy, and Istoni Reza. "ANALIS PENGUKURAN DAN PERHITUNGAN TOTAL HARMONIC DISTORTION (THD) PADA BEBAN NON LINIER." Jurnal Sains & Teknologi Fakultas Teknik Universitas Darma Persada 12, no. 1 (2022): 1–8. http://dx.doi.org/10.70746/jstunsada.v12i1.166.

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Harmonisa mengakibatkan terjadinya distorsi gelombang arus dan tegangan. Harmonisa terjadi karena adanya beban non linier, dimana akan terbentuk gelombang yang berfrekuensi tinggi yang merupakan kelipatan dari frekuensi fundamentalnya. Frekuensi harmonik yang lebih tinggi daripada frekuensi operasi memiliki efek mengurangi efisiensi atau menyebabkan hilangnya daya. khususnya pengaruh jangka panjang yang dimiliki harmonik pada infrastruktur tenaga listrik. Hasil yang telah dilakukan dengan menggunakan beban non linier seperti motor induksi dengan daya 8,6 KW. Pengukuran dan perhitungan THD arus dan motor induksi diukur pada setiap fasanya, hasil THD arus dan tegangan pada motor induksi sebesar 6,98% pada fasa R, 6,84% pada fasa S, 7,71% pada fasa T. Dari hasil yang telah diketahui THD arus pada motor induksi melebihi standar IEEE519 karena standar IEEE519 yaitu 5%. Untuk THD tegangan pada motor induksi sebesar 5% pada fasa R, 4,5% pada fasa S dan 4,4% pada fasa T

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Asnil, Asnil. "Unjuk Kerja Filter Pasif dalam Mereduksi Distorsi Gelombang pada AC/DC Konverter." JTEV (Jurnal Teknik Elektro dan Vokasional) 6, no. 2 (2020): 122. http://dx.doi.org/10.24036/jtev.v6i2.108695.

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This paper shows the use of passive filters to reduce the distortion of input waves in a single phase uncontrolled rectifier. Simulations are carried out with various passive filter models to get a decrease in the value of Total Harmonic Distortion (THD) and correct the distortion of the uncontrolled single phase rectifier input waveform. The results of the simulation show the shape of the input signal changes in the uncontrolled single-phase rectifier, analyzing the value of power factor improvement and also the THD value.

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Richard, Laurensius Richard Mulyadi, and Insani Abdi Bangsa. "STUDI ANALISA PERHITUNGAN NILAI HARMONIK TEGANGAN DAN ARUS PADA BUDDHA TZU CHI HOSPITAL." Aisyah Journal Of Informatics and Electrical Engineering (A.J.I.E.E) 5, no. 1 (2023): 30–38. http://dx.doi.org/10.30604/jti.v5i1.124.

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ABSTRACT  The occurrence of harmonics is caused by the non-linear operation of the electrical load. The level of harmonic distortion or what is called Total Harmonic Distortion (THD) in a transformer can cause losses that affect the efficiency of the transformer. In this study, THD measurements were carried out on four transformers at Tzu Chi Hospital. This research was conducted using observation, documentation, and direct measurements in the field to analyze within the limits of the IEEE 519-2014 standard. The purpose of this study was to analyze the main electrical system at Tzu Chi Hospital, analyze the value of Total Harmonic Distortion (THD) for voltage analysis. and currents at Tzu Chi Hospital. THDv based on the measurement results are transformer 1 4.8%, transformer 2 2.48%, transformer 3 1.51%, transformer 5 5%. While the THDi results obtained after measurement are transformer 1 20.2%, transformer 2 29 ,4%, transformer 3 14.78%, transformer 5 37.8%. Even after measurement, THDv was found to conform to the IEEE 519-2014 standard, and THD was found to be non-compliant with the IEEE 519-2014 standard.  ABSTRAK  Timbulnya harmonik disebabkan oleh operasi beban listrik non-linier. Tingkat distorsi harmonik atau yang disebut dengan Total Harmonic Distortion (THD) pada suatu trafo dapat menimbulkan rugi-rugi yang mempengaruhi efisiensi trafo. Pada penelitian ini dilakukan pengukuran THD pada empat trafo di Rumah Sakit Tzu Chi. Penelitian ini dilakukan dengan metode observasi, dokumentasi, dan pengukuran langsung di lapangan untuk menganalisis kesesuaian dengan batasan standar IEEE 519 2014. Tujuan dari penelitian ini adalah untuk menganalisis sistem kelistrikan utama di Rumah Sakit Tzu Chi, menganalisa perhitungan nilai Total Harmonic Distortion (THD) untuk tegangan dan arus di Rumah Sakit Tzu Chi. THDv berdasarkan hasil pengukuran yaitu transformator 1 4,8%, transformator 2 2,48%, transformator 3 1,51%, transformator 5 5%.sedangkan THDi hasil yang didapat setelah dilakukan pengukuran adalah transformator 1 20,2%, transformator 2 29,4%, transformator 3 14,78%, transformator 5 37,8%. Bahkan setelah pengukuran, THDv diketahui sesuai dengan standar IEEE 519 2014, dan THDi diketahui tidak sesuai dengan standar IEEE 519 2014.

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Rani, R. A., Shakir Saat, Yusmarnita Yusop, Huzaimah Husin, F. K. Abdul Rahman, and A. A. Isa. "The Effects of Total Harmonics Distortion for Power Factor Correction at Non-Linear Load." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 2 (2016): 551. http://dx.doi.org/10.11591/ijpeds.v7.i2.pp551-560.

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This paper presents the effect of total harmonic distortion (THD) in power factor correction (PFC) at non-linear load. This study focuses on the relationship between THD and PFC. This is beacuse,the power factor affects THD. This occurs in power system as we have variety of loads, i. e linear load or non-linear load. The variety of loads will influence the sinusoidal waveform, which comes out from harmonic distortion. Thus, based on this study, we can compare the effective method in improving the power factor as it will not disturb the performance of THD. The focus of study is on the single phase load, where the voltage restriction is 240 V. The analysis will only focus on the consumer, which depends on the variety of non-linear load. Besides, the parameters for analysis are based on the percentage of THD and the value of power factor. The instrument for measuring the parameter is based on power factor correction device or technique. On the other hand, the method that was used for this study is based on simulation which incorporated the Multisim software. At the end of ths study, we can choose the most effective method that can be used to improve the power factor correction without disturbing the THD.

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Farooq, Ajmal, Shanshan Tu, Fiaz Ahmad, et al. "A Seventeen Multilevel High-Power Application Inverter with Low Total Harmonic Distortion." International Journal of Photoenergy 2021 (September 3, 2021): 1–17. http://dx.doi.org/10.1155/2021/9982187.

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In this paper, a new topology of multilevel inverter (MLI) is designed with a fewer number of components and low total harmonic distortion (THD) for high-power photovoltaic (PV) systems. The key limitations of conventional MLI topologies are high total harmonic distortion (THD) and the use of a large number of switching components due to which the cost of the overall inverter is high. In conventional MLI, THD can be significantly reduced by the addition of a large value filter element at the input side; however, it will result in increased size and cost. Thus, achieving a pure sinusoidal AC at the output and to maintain a low THD level is a major issue in conventional MLIs. The proposed MLI has the advantage of decreasing the output THD by using a modified form of the cascaded H-Bridge structure and sine pulse width modulation technique. The proposed inverter consists of 6 unidirectional switches and 2 bidirectional switches, and there is no extra requirement for additional voltage balancing capacitors or clinching diodes. The individual switching states and SPWM operation for generating the gate pulses of the proposed MLI are discussed in detail. Relevant waveforms are plotted, equations are derived, and mathematical analysis is carried out. A steady-state analysis of the proposed MLI demonstrates an output voltage with 17 levels while using only four DC sources. Simulation results of the proposed MLI for single-phase and three-phase structures are obtained, and comparison is carried out with existing MLI topologies which shows that the proposed MLI has significantly low THD and better performance. From the results, it is clear that the proposed MLI has a THD of 3.52% in comparison with four conventional MLIs whose THDs are 6.1%, 6.63%, 7.3%, and 9.93%. Moreover, the proposed MLI generates 17 voltage levels by using only 08 switching devices, whereas the conventional MLIs use more than 10 switching devices for the generation of 15 voltage levels.

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Subhan, Moh Uhida, Ponco Siwindarto, and Bambang Siswojo. "Penurunan Total Harmonic Distortion Pada Penguat Audio Kelas D Menggunakan Metode MQPSO." JOINTECS (Journal of Information Technology and Computer Science) 4, no. 3 (2019): 103. http://dx.doi.org/10.31328/jointecs.v4i3.1202.

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Penguat audio kelas D merupakan penguat audio switching yang mempunyai efisiensi tinggi dibanding penguat audio konvensional (analog). Dalam kondisi ideal, penguat ini mempunyai efisiensi lebih dari 90%. Permasalahan umum yang terjadi pada penguat ini adalah distorsi karena bekerja secara non linier. Sebuah kompensator Proportional Integral (PI) digunakan sebagai filter analog pada umpan balik negatif dibandingkan antara metode trial dan error dengan metode Modified Particle Swarm Optimization (MQPSO) untuk mengurangi Total harmonic Distortion (THD) pada sebuah sistem. Metode MQPSO memiliki keunggulan dalam kinerja yaitu proses sederhana, implementasikan ke sistem sangat mudah dan didalam perhitungan sangat efisien. Hasilnya menunjukkan bahwa nilai THD tanpa optimasi 13.53% sedangkan dengan tambahan metode MQPSO sebesar 13.46% dengan FFT Tool Simulink Matlab V17 dengan selisih THD optimal sebesar 0.07%. Sedangkan pengujian waktu kestabilan yang terdiri dari parameter C2, R2, dan R1 didapatkan THD 0.116% pada 0.174s tanpa optimasi dan 0.113s menggunakan optimasi dengan selisih waktu sebesar 0.063s untuk mencapai kestabilan.

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Braide, S. L. "Evaluation and Analysis of Harmonic Distortion on 330kV Network Case Study Selected Sub-Region Nigerian Power System for Improve Power Quality." Journal of Progress in Engineering and Physical Science 1, no. 1 (2022): 13–22. http://dx.doi.org/10.56397/jpeps.2022.11.03.

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This paper presented fundamental characteristics of harmonic studies and its related work. The total harmonic distortion (THD) of the transmission line were computed using harmonics contents parameters of the waveform (harmonic voltage and impedance magnitude values). Results of THD for the 330kV transmission line are presented using harmonic load flow analysis in ETAP—domain on the view to measure the level of distortion in the network. Figure 2 shows the section of the harmonic load flow simulation in order to check for degree of harmonic distortion in the system under investigation. The provision of the harmonic frequency with greater magnitude exceeding THD and IHD limits are violated in accordance to IEC 61000-3-6:2008 (European Standards) are used as benchmark for measurement. That is the distortion for current and voltage (THDi% and THD%) are 0.5 and 1.5 respectively particularly harmonic order (h) ≤ 13. Consequently, the harmonic frequency violations with greater magnitude of 5th, 7th, 11th, and 13th order in the network are mitigated with 3-unit of single tuned filter to the affected buses for improved power quality.

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Nakaiwa, Koichi, Hiroyuki Wakiwaka, and Kunihisa Tashiro. "Analysis of Three Phase Linear Synchronous Motor Distortion Factor." Materials Science Forum 792 (August 2014): 239–44. http://dx.doi.org/10.4028/www.scientific.net/msf.792.239.

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The relation between the Electro Motive Force (EMF) and Total Harmonic Distortion (THD) was compared and verified by magnet arrangement. Using Halbach array, thrust was more increase by change of magnet arrangement. Moreover, the variable trend of cogging and THD by magnet ratio and magnet form change was checked.

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Ardhi, Setya, Judi Prajetno Sugiono, Hari Sutikno, and Ivan B. Sasaka. "Implementasi Fast Fourier Transform dalam Pengembangan Alat dan Bantuan Program Untuk Mengukur Total Harmonic Distortion." SMATIKA JURNAL 9, no. 01 (2019): 15–22. http://dx.doi.org/10.32664/smatika.v9i01.238.

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Total Harmonic Distortion (THD) adalah salah satu parameter yang menyatakan kualitas dari sebuah sinyal listrik yang hendak dipergunakan dibandingkan dengan sinyal sinusoidal murni. THD adalah suatu ukuran yang menyatakan seberapa besar sinyal yang tidak lagi berbentuk seperti aslinya. Dengan Analisa Fourier, besarnya THD dinyatakan sebagai perbandingan dari rata-rata geometris dari akar jumlah kuadrat harmonisa terhadap fundamental frekuensinya. Penelitian ini bertujuan membangun sebuah alat pengukur THD dengan memanfaatkan microcontroller AVR untuk menghitung THD secara digital. Perhitungan Harmonisa sinyal dalam deret Fourier tidak dilakukan degan cara tradisional, tetapi dilakukan dengan algoritma Fast Fourier Transform (FFT). Algoritma ini secara komputasi numeris akan memberikan kecepatan hitung yang lebih baik dibanding dengan perhitungan tradisional. Uji coba alat dilakukan dengan menggunakan beberapa bentuk sinyal, kemudian hasilnya akan dibandingkan dengan hasil yang dihitung dengan computer. Hasil uji coba menunjukkan bahwa metode ini dapat mampu memberikan akurasi pengukuran besarnya THD dari sebuah sinyal dengan baik.

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Westerhold, Sebastian. "THD Measurement with an Oscilloscope and FFT - Easily Calculate the Distortion Factor." Elektor Magazine 49, no. 519 (2023): 52–54. https://doi.org/10.5281/zenodo.11952518.

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Total Harmonic Distortion, or THD for short, is an important measure of the harmonic content of signals in power supply networks and electronic assemblies, such as audio amplifiers. Usually, special measurement devices are necessary for determining the THD. However, if you have a digital oscilloscope with FFT functionality, you can calculate the THD with a little mathematics.

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Balkrishna, Mirajkar Nilesh, and Dr Rahul Kumar Budania. "Advanced Harmonic Analysis in Industrial Power Systems: Its Impact on Enhancing Power Quality and System Performance." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 11 (2024): 1–7. http://dx.doi.org/10.55041/ijsrem38510.

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This paper presents an advanced harmonic analysis of industrial power systems, focusing on its impact on enhancing power quality and system performance. The study investigates the harmonic distortions caused by nonlinear loads, particularly those introduced by Variable Frequency Drives (VFDs), in a manufacturing plant. Measurements of key electrical parameters, such as voltage, current, and Total Harmonic Distortion (THD), were recorded and analysed. The results reveal significant harmonic distortion levels, exceeding industry standards, which can lead to reduced equipment efficiency and potential damage. By adhering to IEEE 519 guidelines and implementing harmonic mitigation strategies, such as filters and power factor correction, the paper demonstrates how power quality can be improved. The findings provide a foundation for future simulation and optimization efforts aimed at reducing harmonic distortion and enhancing system performance. Keywords: Total Harmonic Distortion (THD), Harmonic Analysis, Power Quality, Industrial Power Systems, Current Distortion.

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Nazir, Refdinal, Syafii Syafii, Andi Pawawoi, Fadjril Akbar, and Axel Doriza. "Differences in the impact of harmonic distortion due to the installation of electronic load controller in self-excited induction generator and synchronous generator." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 1 (2019): 104. http://dx.doi.org/10.11591/ijpeds.v10.i1.pp104-116.

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In general, the application of Self-Excited Induction Generator (SEIG) or Synchronous Generator (SG) on the Stand-Alone Micro Hydel Power Plant (MHPP) is equipped with Electronic Load Controller (ELC) to control generator output during variations in consumer load. One type of ELC that is cheap and rigid developed today is the ELC, which is constructed by the uncontrolled bridge rectifier with DC Chopper. Based on the operational concept, basically this type of ELC can be implemented on both SEIG and SG, but both of these generators will have a different harmonic distortion effect on the output and its load. This paper examines the differences in the effects of harmonic distortions due to ELC installation on SEIG and SG. The initial stage of this study was to design the ELC developed. Then, the harmonic distortion response due to the installation of ELC on SEIG and SG is tested, which includes harmonic distortion in: stator current, PCC voltage, and consumer load current. THDI (Current Total Harmonic Distortion) stator current at SEIG with ELC has shown an average value smaller than the THD stator current in SG with ELC. Likewise, the THDV (Voltage Total Harmonic Distortion) value of PCC voltage and THDI value of the current consumer load on SEIG equipped with ELC has been shown to be smaller than the THDV value of PCC voltage and THDI value of the current consumer load on SG equipped with ELC. The effects of harmonic distortions due to the installation of ELCs that developed in this study on SEIG is still within the permitted limits, while on the SG, the harmonic distortion reduction is needed at the generator output.

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Siahaan, Fernando Jeremia, Eva Magdalena Silalahi, Bambang Widodo, and Robinson Purba. "PENGUKURAN TOTAL HARMONIC DISTORTION (THD) TERHADAP LAMPU HEMAT ENERGI (LHE) DAN LIGHT-EMITTING DIODE (LED)." Lektrokom : Jurnal Ilmiah Teknik Elektro 3, no. 1 (2020): 8. http://dx.doi.org/10.33541/lektrokom.v3i1.3372.

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Abstract. Along with the rapid development of power electronics technology which is also useful for saving electrical energy. This technology is also used in lighting such as energy saving lamps (LHE) and light-emitting diode (LED). However, LHE and LED are non-linear loads that cause electrical power quality problems, namely producing voltage and current waveforms that are no longer sinusoidal or distorted waveforms. Distorted waves cause harmonic waves which have a frequency multiple of the fundamental frequency. The sum of the effective values of the harmonic components of the distorted waveform is calculated in terms of total harmonic distortion (THD). This study found that the THD value of the voltage generated by the LHE and LED loads was equal is 0.80% -1.3%, while the current THD generated by the LHE load was 68.57% - 78.68% and the LED was 72, 15% - 86.04%. The current THD value generated by the LHE and LED loads does not fulfil the IEEE Std 519-2014 harmornic distortion limits. The use of LHE and LED lamps simultaneously will reduce the resulting current THD value by 3% to 9%.

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Raharja, Lucky Pradigta Setiya, Ony Asrarul Q., Zainal Arief, and Novie Ayub Windarko. "Reduction of Total Harmonic Distortion (THD) on Multilevel Inverter with Modified PWM using Genetic Algorithm." EMITTER International Journal of Engineering Technology 5, no. 1 (2017): 91–118. http://dx.doi.org/10.24003/emitter.v5i1.174.

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In this research, modified PWM has been applied to the multilevel inverter (MLI) single-phase three-level diode clamp full bridge. Modified PWM is performed to produce minimum Total Harmonic Distortion (THD) the voltage because the quality of the good voltage is indicated by small THD. The THD indicates the quality of AC voltage source. The THD standard by the IEEE STD 519-1992 Harmonic Voltage Limits is 5% and the Pacific Corp standard is 8%, if the THD value is greater than the THD standard it can cause the electronic load to be damaged due to the damaged waveform. Modified PWM is applied by adding a 50 Hz sinusoidal reference signal with a sinusoidal signal which has a certain amplitude, frequency and phase shift angle. The frequency of the adder signal is the frequency at which the value of the individual harmonic voltage appears (n harmonic). To get maximum result, optimization using Genetic Algorithm (GA) method to determinate amplitude & phase shift angle done. The result of implementation hardware with modified PWM shows smaller THD voltage compared to the THD voltage with Sinusoidal Pulse Width Modulation (SPWM) switching up to 0.19 or decrease 65,51 % for modified PWM of harmonic injection n = 7 with GA optimization ma= 0.8 (A=0.0936 and Ã¸ = 0 rad) and up to 0.08 or decrease 12,30 % for modified PWM of harmonic injection n = 22 with GA optimization ma = 0.4 (A=0.1221 and Ã¸ = 0 rad).

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Wong, Quan Ming, Yee Wei Sea, Wei Tik Chew, et al. "Determination of minimal total harmonic distortion for single-phase multilevel inverter." International Journal of Power Electronics and Drive Systems (IJPEDS) 15, no. 3 (2024): 1662. http://dx.doi.org/10.11591/ijpeds.v15.i3.pp1662-1670.

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Multilevel inverters (MLIs) offer numerous advantages, such as low voltage stresses on power switches, low switching losses, and high efficiency. Switching angles applied to MLI must be selected carefully to generate an output voltage waveform with low total harmonic distortion (THD). This paper proposes an improved algorithm to determine the switching angles with low THD for MLI. The proposed algorithm has been implemented using a MATLAB script to compute a set of switching angles with low THD from 3- to 31-level cascaded H-bridge MLI (CHBMLI). A PSIM simulation model has been developed to validate the switching angles and the corresponding THDs obtained from the MATLAB script. An experimental prototype has also been developed to validate the simulation results. The results obtained from the MATLAB script, the PSIM simulation, and the experimental measurement are in good agreement.

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Wong, Quan Ming, Yee Wei Sea, Wei Tik Chew, et al. "Determination of minimal total harmonic distortion for single-phase multilevel inverter." International Journal of Power Electronics and Drive Systems (IJPEDS) 15, no. 3 (2024): 1662–70. https://doi.org/10.11591/ijpeds.v15.i3.pp1662-1670.

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Multilevel inverters (MLIs) offer numerous advantages, such as low voltage stresses on power switches, low switching losses, and high efficiency. Switching angles applied to MLI must be selected carefully to generate an output voltage waveform with low total harmonic distortion (THD). This paper proposes an improved algorithm to determine the switching angles with low THD for MLI. The proposed algorithm has been implemented using a MATLAB script to compute a set of switching angles with low THD from 3- to 31-level cascaded H-bridge MLI (CHBMLI). A PSIM simulation model has been developed to validate the switching angles and the corresponding THDs obtained from the MATLAB script. An experimental prototype has also been developed to validate the simulation results. The results obtained from the MATLAB script, the PSIM simulation, and the experimental measurement are in good agreement.

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Reddy, K. M. N. Chaitanya Kumar. "Application of ANFIS to Minimize Total Harmonic Distortion in Brushless DC Motor." International Journal for Research in Applied Science and Engineering Technology 11, no. 7 (2023): 113–21. http://dx.doi.org/10.22214/ijraset.2023.54581.

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Abstract: Total harmonic distortion provides direct impact on power quality in distributed systems. The work presents reduction of Total harmonic distortion (THD) in Brushless DC motor (BLDC) using adaptiveneuro controller. The configured controller is provided with a rule base, input and output membership functions. The BLDC motor is modelled in MATLAB-SIMULINK with load variation that have direct impact on the functioning of a system. The parameters include load, resistance and inertia of BLDC motor. The work results are obtained after simulating BLDC system under different load configurations. The conclusion is provided with the calculation of THD so produced using Adaptive neuro configured controller

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Shrestha, Sulav, Sagar Poudel, and Sajesan Ghimire. "Design and Analysis of Single-Tuned Passive Filters for Total Harmonic Distortion (THD) Mitigation and Power Quality Enhancement." Journal of Engineering and Sciences 4, no. 1 (2025): 69–78. https://doi.org/10.3126/jes2.v4i1.76171.

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Harmonic distortion caused by nonlinear loads is a significant challenge in power systems, often resulting in reduced efficiency, overheating, and equipment malfunction. Despite the availability of various mitigation techniques, many fail to offer a cost-effective and practical solution for distribution networks. This research addresses that gap by designing and analyzing a five-stage single-tuned passive filter (STPF) system to mitigate harmonics in a 400V, 50Hz distribution network. The main objective is to reduce Total Harmonic Distortion (THD) in voltage and current to meet IEEE 519-2022 standards. The proposed filter system targets the 5th, 7th, 9th, 11th, and 13th harmonic orders using a simulation model developed in MATLAB/Simulink. The system initially showed high THD levels of 16.06% in voltage and 17.57% in current. After applying the filters, the voltage THD was reduced to 3.89%, and the current THD dropped to 2.52%. These results confirm the effectiveness of STPFs in improving power quality under nonlinear loading conditions.

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Saleh, Asef A., Rakan Khalil Antar, and Harith Ahmed Al-Badrani. "Design of new structure of multilevel inverter based on modified absolute sinusoidal PWM technique." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 4 (2021): 2314. http://dx.doi.org/10.11591/ijpeds.v12.i4.pp2314-2321.

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The advantage of multilevel inverters is to produce high output voltage values with distortion as minimum as possible. To reduce total harmonic distortion (THD) and get an output voltage with different step levels using less power electronics switching devices, 15-level inverter is designed in this paper. Single-phase 11-switches with zero-level (ZL) and none-zero-level (NZL) inverter based on modified absolute sinusoidal pulse width modulation (MASPWM) technique is designed, modelled and built by MATLAB/Simulink. Simulation results explained that, multilevel inverter with NZL gives distortion percent less than that with ZL voltage. The THD of the inverter output voltage and current of ZL are 4% and 1%, while with NZL is 3.6% and 0.84%, respectively. These results explain the effectiveness of the suggested power circuit and MASPWM controller to get the required voltage with low THD.

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Asef, A. Saleh, Khalil Antar Rakan, and Al-Badrani Harith. "Design of new structure of multilevel inverter based on modified absolute sinusoidal PWM technique." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 4 (2021): 2314–21. https://doi.org/10.11591/ijpeds.v12.i4.pp2314-2321.

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The advantage of multilevel inverters is to produce high output voltage values with distortion as minimum as possible. To reduce total harmonic distortion (THD) and get an output voltage with different step levels using less power electronics switching devices, 15-level inverter is designed in this paper. Single-phase 11-switches with zero-level (ZL) and none-zero-level (NZL) inverter based on modified absolute sinusoidal pulse width modulation (MASPWM) technique is designed, modelled and built by MATLAB/Simulink. Simulation results explained that, multilevel inverter with NZL gives distortion percent less than that with ZL voltage. The THD of the inverter output voltage and current of ZL are 4% and 1%, while with NZL is 3.6% and 0.84%, respectively. These results explain the effectiveness of the suggested power circuit and MASPWM controller to get the required voltage with low THD.

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Chien, Siong Kai, Sy Yi Sim, Wahyu Mulyo Utomo, et al. "Enhanced DTC induction motor drives for THD minimization performance improvement with multilevel inverter." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 1 (2022): 93. http://dx.doi.org/10.11591/ijpeds.v13.i1.pp93-101.

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Direct torque control (DTC) is a method applied in induction motor (IM) drives to control the speed and torque of IM accurately and independently without feedback signal. However, in fast fourier transform (FFT) analysis, the total harmonic distortion (THD) of the IM drives is high in DTC method with conventional inverter (CI). Therefore, the purpose of this study is to minimize the THD without affecting the drive’s performance. A DTC IM drive with multilevel inverter (MLI) is proposed in this study to reduce THD and preserve good speed and torque response of IM simultaneously. DTC IM drive with proposed MLI based THD minimization has several advantages over the DTC IM drive with CI, including higher generated output voltage with low distortion, operate under low switching frequency, and work with renewable energy. In order to prove the effectiveness of the proposed MLI based THD minimization in DTC IM drive, MATLAB Simulink is used to investigate the response of the IM drive and THD under different operating condition. From this study, proposed MLI based THD minimization DTC IM drive is able to reduce THD with a maximum of 13% in low speed operation as compared to DTC IM drive with CI.

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Saputra, Rachmat Deska, Sitti Amalia, Yusreni Warmi, Sepannur Bandri, and Andi M. Nur Putra. "Analisa Pengaruh Arus Bocor Terhadap Total Harmonic Distortion Pada Isolator 150 kV Yang Terkontaminan Lumut Menggunakan Transformasi Fourier." G-Tech: Jurnal Teknologi Terapan 8, no. 4 (2024): 2938–45. http://dx.doi.org/10.70609/gtech.v8i4.5476.

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Penelitian ini menyelidiki Total Harmonic Distortion (THD) pada isolator 150 kV yang terkontaminasi lumut berdasarkan pola arus bocor dengan tiga variasi tegangan uji, yaitu 10.578 V, 21.063 V, dan 30.569 V. Pengujian dilakukan secara eksperimental di Laboratorium Tegangan Tinggi Universitas Gajah Mada dengan suhu 28,2 °C dan kelembaban 57,8%. Parameter yang dianalisis meliputi bentuk gelombang, spektrum frekuensi (FFT), dan THD, yang dihitung menggunakan Fast Fourier Transform (FFT) melalui software NI DIAdem. Hasil pengujian menunjukkan tidak adanya hubungan kuat antara arus bocor dan THD. Pada arus bocor 0,103 mA, THD yang dihasilkan sebesar 21,84%, sedangkan pada arus 0,207 mA menghasilkan THD 18,27%, dan 0,306 mA menghasilkan THD 36%. Berdasarkan stdanar IEEE STD 519-2014, THD pada isolator 150 kV yang terkontaminasi lumut melebihi batas maksimum 15%, sehingga isolator ini tidak aman digunakan pada saluran transmisi Koto Panjang-Payakumbuh.

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Santoso, Satria Adji, and Agus Ulinuha. "Harmonic Distortion Analysis Of On-grid Photovoltaic Panel Integration In Load Sharing Scheme." ELKHA 17, no. 1 (2025): 77–83. https://doi.org/10.26418/elkha.v17i1.91311.

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Harmonic analysis is crucial to maintain the system power quality, especially in photovoltaic panels with load sharing scheme. Previous studies have discussed the impact of harmonic distortion on electric power systems in general, but there is still limited discussion on on-grid photovoltaic panel systems without the load-sharing scheme. Harmonic is a distortion phenomenon of current and voltage that is higher than fundamental frequency. The consumption of nonlinear loads contributes to the rising of harmonic distortion that has a bad impact on the system's power quality. This study aims to analyze and compare the levels of harmonic distortion on on-grid photovoltaic panels with a load-sharing scheme and evaluate the suitability with the IEEE 519-2014 standard. The result of this study shows that the Total Harmonic Distortion (THD) on the current (THDi) in PLN’s load and network exceeds the limit that is stipulated in IEEE 519-2014. THD current in PLN’s loads and network is higher than the output current from the on-grid inverter because of the consumption of the nonlinear load. Meanwhile, Total Harmonic Distortion (THD) on the voltage (THDv) in the on-grid inverter, electric network, and load tends to be lower and still within the safe limit. This study is expected to support the implementation of an effective preventive strategy to reduce harmonic distortion on the performance of on-grid photovoltaic panels that will be optimum in the load-sharing scheme.

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Siong, Kai Chien, Yi Sim Sy, Mulyo Utomo Wahyu, et al. "Enhanced DTC induction motor drives for THD minimization performance improvement with multilevel inverter." International Journal of Power Electronics and Drive Systems (IJPEDS)stortion 13, no. 1 (2022): 93–101. https://doi.org/10.11591/ijpeds.v13.i1.pp93-101.

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Direct torque control (DTC) is a method applied in induction motor (IM) drives to control the speed and torque of IM accurately and independently without feedback signal. However, in fast fourier transform (FFT) analysis, the total harmonic distortion (THD) of the IM drives is high in DTC method with conventional inverter (CI). Therefore, the purpose of this study is to minimize the THD without affecting the drive’s performance. A DTC IM drive with multilevel inverter (MLI) is proposed in this study to reduce THD and preserve good speed and torque response of IM simultaneously. DTC IM drive with proposed MLI based THD minimization has several advantages over the DTC IM drive with CI, including higher generated output voltage with low distortion, operate under low switching frequency, and work with renewable energy. In order to prove the effectiveness of the proposed MLI based THD minimization in DTC IM drive, MATLAB Simulink is used to investigate the response of the IM drive and THD under different operating condition. From this study, proposed MLI based THD minimization DTC IM drive is able to reduce THD with a maximum of 13% in low speed operation as compared to DTC IM drive with CI.

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Kuwałek, Piotr, and Grzegorz Wiczyński. "Problem of Total Harmonic Distortion Measurement Performed by Smart Energy Meters." Measurement Science Review 22, no. 1 (2022): 1–10. http://dx.doi.org/10.2478/msr-2022-0001.

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Abstract Currently, electricity is treated as commodity that should be delivered from a distributor to a consumer with a certain quality. The power quality is defined by the set of measures with specific limit values. One of the basic measures is the Total Harmonic Distortion (THD), which allows to assess the level of the voltage distortion. The measurement of THD ratio should be carried out in accordance with the normative specification. It is assumed that this requirement is met by class A power quality analyzers. Currently, measures are taken to monitor power quality in a large number of measurement points with the use of smart energy meters that are part of the Advanced Metering Infrastructure (AMI). The paper presents the problem of THD ratio measurement by AMI meters if voltage fluctuations occur. In such situation, inconsistency in measurement results of AMI meters and class A power quality analyzers occurs. The problem is presented on the basis of laboratory study results in which disturbances in power grid are recreated.

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Maksimov, Anton, and Anatoliy Kubitsky. "RESEARCH DEPENDENCE TOTAL HARMONIC DISTORTION FROM FREQUENCY IN AMPLIFIERS WITH DIFFERENT TYPES AND DEPTHS OF NEGATIVE FEEDBACK." SYNCHROINFO JOURNAL 9, no. 2 (2023): 30–36. http://dx.doi.org/10.36724/2664-066x-2023-9-2-30-36.

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In work examined one of the methods obtaining the dependence of the harmonic distortion from frequency in audio power amplifier for computer circuit simulation was investigated. This made it possible to assess for the first time the influence of both the form and the depth of the negative feedback on the dependence total harmonic distortion from frequency and to reveal the conditions under which an increase in the depth of the negative feedback leads to an increase in the harmonic coefficient. The study does not show the effect of each individual cascade on the dependence of the harmonic coefficient on frequency. The study was carried out at voltage gain (GV) equal to 60, 50, 40, 30 and 20 decibels, where GV =60dB corresponds to the minimum negative feedback (NF) depth, and GV =20dB to the maximum NF depth. To obtain the dependence total harmonic distortion (THD) factor THD=F(f) in the MicroCap11 simulation program, Harmonic Distortion analysis was used.

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K., Kandan, Senthilkumar K., and Dhivya K. "TOTAL HARMONIC DISTORTION ANALYSIS OF MATRIX CONVERTER." International Journal of Multidisciplinary Research and Modern Education 2, no. 2 (2016): 174–82. https://doi.org/10.5281/zenodo.154667.

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This paper deals with the validation and design analysis of Matrix converter for variable frequency using mathematical equations. The analysis was done using Venturini modulation algorithm. The PI controller is used for Matrix converter to reduce Total Harmonic Distortion (THD) in the output current. The comparative study is done for open loop and closed loop PI compensation in MATLAB-Simulink. Furthermore, the output waveforms are produced with significant reduction in the Total Harmonic Distortion.

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Sinvula, Rosalia, Khaled Mohamed Abo-Al-Ez, and Mohamed Tariq Kahn. "A Proposed Harmonic Monitoring System for Large Power Users Considering Harmonic Limits." Energies 13, no. 17 (2020): 4507. http://dx.doi.org/10.3390/en13174507.

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Most power utilities within Southern Africa are faced with the challenges of harmonic distortion due to the high penetration of renewable energy sources (RES) and the use of electronic devices. There is an excessive total harmonic distortion (THD) measured at the point of common coupling (PCC). In this paper, a proposed harmonic monitoring system for large power users (LPUs) is developed. This proposed system considers harmonic limits of the individual and THD of the customers allowed injecting into the network, which should be part of the contractual electricity supply agreement (ESA). Hence, it will enable the monitoring of harmonic distortion to be smooth by determining whether the customer has passed or failed compliance for individual harmonic order and the THD of the voltage. The measurements of harmonic distortion are done using the Unipower power quality (PQ) analyzers that are connected at different points within the industrial network. Measurements of harmonic distortion of an industrial site are compared to the simulation results performed by DIgSILENT software to validate the proposed harmonic monitoring system. Based on the validation results, it is recommended that the ESA between the power utilities and the customers should consist of the harmonic limits.

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Kandavel, B., G. Uvaraj, and M. Manikandan. "Comparative Study of Total Harmonic Distortion in Multilevel Inverters Based WECS." International Journal of Engineering & Technology 7, no. 3.1 (2018): 42. http://dx.doi.org/10.14419/ijet.v7i3.1.16794.

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This paper presents comparative study of Total Harmonic Distortion (THD) and its individual harmonic contents without grid and with grid for Diode clamped multi level inverter (DCMLI) and Flying capacitor clamped multilevel inverter (FCMLI) based Doubly Fed Induction Generator (DFIG) employing PI and Fuzzy logic controller (FLC). Simple method to control for a variable speed wind energy conversion system with a DFIG is connected to the grid through a diode rectifier and a diode clamped multilevel inverter (DCMLI). The DC-link voltage is controlled through a DC-DC boost converter to keep the DC voltage at constant value. Inverter is controlled by sinusoidal pulse width modulation technique, which supplies power to the grid. The THD and its harmonic content are studied for different wind speeds. DFIG fed flying capacitor multi level inverter (FCMLI) based WECS connected to load as well as grid. FCMLI is controlled through sinusoidal pulse width modulation. Voltage and current harmonics are studied. The results of both multilevel inverters are compared. It shows that the level of harmonic content of two types of multilevel inverters working at different wind speeds indicates that Total Harmonic Distortion (THD) for DCMLI has given best results.

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Akhinov, Ihsan Auditia, and Devi Handaya. "Rancangan EMI Filter untuk Inverter 3 Fasa Berdasarkan Metode SPWM." Prosiding SENIATI 6, no. 2 (2022): 273–79. http://dx.doi.org/10.36040/seniati.v6i2.5031.

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Hasil metode Sinus Pulse Width Modulation (SPWM) untuk inverter 3 fasa mempunyai nilai Total Harmonic Distortion (THD) yang bervariasi. Standar nilai THD berdasarkan IEEE 519-2014 adalah dibawah 5%. Nilai THD yang kecil dapat diperoleh dengan menngatur nilai frekuensi gelombang segitiga menjadi tinggi. Namun, spesifikasi perangkat keras yang dibutuhkan menjadi lebih tinggi. Penelitian ini mencoba melakukan pendekatan pada bagian filter menggunakan simulasi MATLAB. Jenis Filter yang digunakan merupakn EMI filter dengan kofigurasi PI. Konfigurasi Filter EMI dan frekuensi segitiga 1000 Hz menghasilkan nilai THD dibawah 5% dengan range frekuensi sinus 25-100 Hz.

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Journal articles on the topic 'Total hormonic distortion(THD)'

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