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Journal articles on the topic 'Low harmonic distortion'
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1
Muhammad, Salman, Basit2 Abdul, Ahmad Aemal, Syed Shah zeeshan, and Alam Kamran. "Modeling of Cascaded H-Bridge Multi-level Inverter Having Low Total Harmonic Distortion by using Equal Phase Distribution Method." International Journal of Engineering Works (ISSN: 2409-2770) 6, no. 03 (2019): 84–89. https://doi.org/10.5281/zenodo.2585862.
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Multi-level inverters’ popularity over traditional inverters can be attributed to its low total harmonic distortion. Multi-level inverter is used both for high and low power applications. This study uses Equal phase method to analyze the total Harmonic distortion of 3, 5, 7 and 9 levels by using Cascaded H-Bridge configuration for such analysis. The total harmonic distortions of three, five, seven and nine levels are analyzed, studied and finally their output is compared through fast Fourier transform. Results are acquired by simulating Cascaded H-Bridge Multi-level inverter with MATLAB/Simulink. Simulation results reveal that total Harmonics Distortion reduces as voltage level is increased. Total harmonic distortion for 3, 5, 7 and 9 levels is 41.42, 39.46, 39.40 and 22.50 percent respectively.
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Adesina, Lambe Mutalub, Olalekan Ogunbiyi, Khalil D. Dalegan, and Ahmed B. Olaoye. "Assessment of Total Harmonic Distortion for Power Quality Improvement in Low Voltage Distribution Networks." Journal Of Engineering Research Innovation And Scientific Development 3, no. 1 (2025): 56–71. https://doi.org/10.61448/jerisd31256.
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Ensuring high power quality in low-voltage distribution networks is crucial for efficient and reliable electricity supply. However, the increasing presence of nonlinear loads introduces harmonics into the power system network (PSN), leading to waveform distortions that degrade power quality. These harmonics, primarily generated by electronic devices, motors, generators, and transformers, contribute to power losses, system instability, and unbalanced load distribution at feeder pillars, ultimately affecting service delivery. This study aims to assess the Total Harmonic Distortion (THD) levels in a distribution network powered by a distribution transformer (DT) from a Nigerian power utility company, with a focus on residential, commercial, and smallscale industrial consumers. A Fluke energy analyzer was deployed at the secondary side of the DT, with all necessary calibrations and presetting completed before data acquisition. The collected harmonic data was subsequently processed and analyzed using spreadsheet software to determine the extent of waveform distortion. The results provide insights into the harmonic levels present in the distribution network and their impact on power quality. Findings from the analysis highlight the severity of harmonic distortions, their potential consequences on equipment performance and network stability, and the need for appropriate mitigation strategies. This assessment serves as a foundation for recommending power quality improvement measures to enhance the reliability and efficiency of low-voltage distribution networks.
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Ilo, F. C., and J. Eke. "Harmonic Analysis and Challenges in Developing Country Power Grids." European Journal of Engineering and Environmental Sciences 7, no. 4 (2023): 1–11. https://doi.org/10.5281/zenodo.8416470.
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<em>Nonlinear and electronically switched loads cause harmonic pollution, distort current and voltage waveforms, and increase losses in the power system. Studies in harmonics have become prevalent with the increasing use of capacitors and power-electronic converters in power systems to improve voltage, power factor, and system reliability. Moreover, the International Electrotechnical Commission (IEC) has set the standard limit of harmonic current injected by nonlinear loads in public distribution. In this study, the focus was on modelling a power grid, harmonic analysis, and reporting of harmonic sources and distortion limit violations. The harmonic load flow examines the effect of harmonic current on the system using the Electrical Transient Analyzer Program (ETAP), version 19. The result shows violations of the IEC standard limit of voltage and current harmonic distortions. Voltage distortions were notably higher in the distribution lines compared to sub-transmission lines, with an average of 23.61% at 33kV, 21.13% at 11kV, and 7.29% at 132kV. Equally, current distortions (THDi%) were significantly higher in the distribution lines, with an average of 70.56% at 11kV, 77.39% at 33kV, and 75.28% at 132kV. In addition, the individual harmonic distortion analysis reveals 3rd, 5th, 7th, and 9th harmonic orders, measured at 14.76%, 14.09%, 5.14%, and 2.10% for the 11kV feeders, and 19.92%, 11.08%, 5.40%, and 3.26% for the 33kV feeders, respectively. The 132kV feeder primarily experienced significant distortion from the 5th harmonic order, measuring at 6.73%. The combination of high 5<sup>th</sup>, 7<sup>th</sup>, and 3<sup>rd</sup> harmonics causes critical issues to power systems’ quality. In developing countries like Nigeria, higher harmonic distortions are common due to factors including aging infrastructure, rapid industrial growth, limited regulatory standards, inadequate investment in power quality solutions, low awareness, financial constraints, and fragile electrical grids.</em>
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Lowczowski, Krzysztof, Jaroslaw Gielniak, Zbigniew Nadolny, and Magdalena Udzik. "Analysis of the Impact of Volt/VAR Control on Harmonics Content and Alternative Harmonic Mitigation Methods." Energies 17, no. 22 (2024): 5561. http://dx.doi.org/10.3390/en17225561.
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This article presents information about harmonic distortion and resonance in distribution networks. The theory behind harmonics and resonance is presented. Examples from the literature and the results of power quality measurements, as well as the authors’ experiences connected with significant changes in harmonic distortions, are presented. The harmonic resonance phenomenon is explained, and the risk of resonance in a distribution system network is highlighted. Attention is paid to the connection of a new power plant to the network; however, other risks, e.g., those connected to network reconfiguration, are also highlighted. Further simulation case studies are presented to show interactions between volt/VAR control and harmonic distortion. Simulations consider a few scenarios: impact of voltage change on impedance characteristics and resulting harmonics amplitudes, the impact of a capacitor on impedance characteristics, and the impact of network expansion on harmonic distortion. The final part presents alternative, low-cost harmonics mitigation methods. The concept of the utilization of phase-shifting transformers for two twin-type 1 MW plants located next to each other is verified by on-site measurement. The concept of adapting the harmonics spectrum of new devices to impedance characteristics is presented. Finally, an alternative concept for active mitigation of harmonics under resonance conditions is provided. The concept is based on the reactive power correction in order to change the harmonics phase shift. A comparison of harmonic mitigation methods and general recommendations are provided. Further research is outlined.
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Saad T. Y. Alfalahi. "Harmonic Distortion Analysis and Mitigation in an On-Grid Wind Farm using Passive Filters: A Case Study on the Shahat Distribution Network." Journal of Information Systems Engineering and Management 10, no. 44s (2025): 812–22. https://doi.org/10.52783/jisem.v10i44s.8661.
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The numerous non-linear power electronic components in a wind energy conversion system (WECS) cause harmonic distortion, which diminishes the quality of the electricity produced. For WECS to function optimally with the power grid, these distortions must not exceed the limits established by international standards for total harmonic distortion (THD) in voltage and current waveforms. As required by current rules, this study looks at the harmonic distortion at the point of common coupling (PCC) between a planned 10.5 MW wind farm and the SHAHAT distribution network in northeastern Libya. MATLAB/Simulink is employed to simulate the wind farm conversion units and execute harmonic elimination with passive harmonic filters (PHFs). The frequency spectrum and THD findings at the PCC are assessed in compliance with the IEEE 519 standard. The results demonstrated the significant efficacy of PHFs in reducing low-order harmonics below 2 kHz while being ineffectual in the supra-harmonic zone. The findings of this study are juxtaposed with analogous literature, and the outcomes of this comparison are delineated.
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Shehata, Mariam K., Hossam Eldin Mostafa Attia, Basem E. Elnaghi, and Nagwa F. Ibrahim. "Power factor correction AC-DC boost converter using PI-hysteresis current control." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 3 (2023): 1597. http://dx.doi.org/10.11591/ijpeds.v14.i3.pp1597-1603.
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The AC line input voltage is frequently rectified by single-phase diode rectifiers and filtered using sizable electrolytic capacitors. The capacitor draws current in brief pulses, so harmonics distort the line current, resulting in high losses. Harmonics and line current distortions harm the unity power factor and efficiency. This article adopts a simple single-stage AC-DC converter with a high-power factor and low total harmonic distortion. The PI hysteresis current control was utilized to reduce the total harmonic distortion and increase the power factor at full load. The PI controller was added to the outer voltage loop to regulate the output voltage. Ziegler-Nichol's tuning method was used to determine the controller gain levels. Simulation results were obtained for the AC-DC converter at a constant switching frequency to show the benefits of the proposed control method, which has a low total harmonic distortion and a high-power factor compared with cases without a controller. The proposed control method is accurate and efficient for achieving the power factor correction converter. Besides, the proposed control was stable during dynamic and steady-state responses.
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Mariam, K. Shehata, E. Mostafa Attia Hossam, E. Elnaghi Basem, and F. Ibrahim Nagwa. "Power factor correction AC-DC boost converter using PI-hysteresis current control." International Journal of Power Electronics and Drive Systems 14, no. 3 (2023): 1597~1603. https://doi.org/10.11591/ijpeds.v14.i3.pp1597-1603.
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The AC line input voltage is frequently rectified by single-phase diode rectifiers and filtered using sizable electrolytic capacitors. The capacitor draws current in brief pulses, so harmonics distort the line current, resulting in high losses. Harmonics and line current distortions harm the unity power factor and efficiency. This article adopts a simple single-stage AC-DC converter with a high-power factor and low total harmonic distortion. The PI hysteresis current control was utilized to reduce the total harmonic distortion and increase the power factor at full load. The PI controller was added to the outer voltage loop to regulate the output voltage. Ziegler-Nichol's tuning method was used to determine the controller gain levels. Simulation results were obtained for the AC-DC converter at a constant switching frequency to show the benefits of the proposed control method, which has a low total harmonic distortion and a high-power factor compared with cases without a controller. The proposed control method is accurate and efficient for achieving the power factor correction converter. Besides, the proposed control was stable during dynamic and steady-state responses.
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Boora, Kamaldeep, Anurag Kumar, Isha Malhotra, and Vikram Kumar. "Harmonic reduction using Particle Swarm Optimization based SHE Modulation Technique in Asymmetrical DC-AC Converter." International journal of electrical and computer engineering systems 13, no. 10 (2022): 867–75. http://dx.doi.org/10.32985/ijeces.13.10.10.
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Many inverters play an important role in transmitting and processing energy to power system networks. To reduce the cost and size of multilevel inverters, various topologies have been included in the literature. But these topologies do not look at the complete harmonic distortion in the output waveform. In this study, a modern multilevel inverter structure, a mutated H-bridge inverter is adopted that demands a small amount of switches, driver circuits, power diodes and DC voltage sources compared to conventional multilevel inverters to produce the required level in the output voltage. The mutated H-bridge converter uses a nearest-level control method, produces high value of total harmonic at the output voltage and low-level harmonics content is also high, which is more dangerous than high-order harmonics. Therefore, the selective harmonic elimination (SHE) method is used to reduce the low frequency harmonics and the total harmonic distortion to the output voltage. Comparison of complete harmonic deviation and low-level harmonic content using the above-mentioned control strategies on the 31-level inverter is presented. Simulation studies confirm the performance of a 31-level inverter with low-order harmonics and a complete harmonic distortion using the SHE process. The effectiveness and accuracy of the SHE in producing 31 level waveform is demonstrated by utilizing the test outcomes and the THD found is of the order of 2.8%, 1.7%, 1.7% and 1% for the modulation index values of 0.5590, 0.7440, and 0.8380 and 0.9110 respectively.
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Afif, Salim, I. W. Sukerayasa, and W. G. Ariastina. "Analisis Pengaruh Harmonisa terhadap Rugi-Rugi Daya pada Sistem Tegangan Rendah dan Transformator GR088 di Penyulang Menjangan." Jurnal SPEKTRUM 5, no. 2 (2018): 1. http://dx.doi.org/10.24843/spektrum.2018.v05.i02.p01.
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Menjangan feeder is a medium-voltage network system which distributes electricity throughout Gilimanuk and some areas in Buleleng. It has 69 distribution substations, which one of them, substation GR088, contributes to the highest value of the total harmonic distortion (THDi). In this research, the effect of harmonic distortions on losses at low voltage system of substation GR088 will be evaluated.The method used in this study is direct measurement of harmonic distortions at each low-voltage costumer whose electricity is generated by substation GR088 at Menjangan Feeder. Software is also used to perform harmonic load flow analysis and simulations. The total value of losses on transformer and low voltage system of substation GR088 Menjangan feeder, in a no-harmonic condition is 1481,7 Watt. On under-harmonic condition, the total value of losses is 1552,5 Watt. Therefore there is a 70,8 Watt difference between the two conditions. At this case, beside the heat created by the harmonic distortion that can affect the performance of transformers, it also cause a quite great value of losses, which is 1,7 kWh per day, or approximately 620 kWh per year. It means the harmonic distortion in substation GR088 can cause PT PLN (Persero) lose Rp.910.018,8 per year.
10
Al-Sharif, Yahya M., Gamal M. Sowilam, and Tamer A. Kawady. "Harmonic Analysis of Large Grid-Connected PV Systems in Distribution Networks: A Saudi Case Study." International Journal of Photoenergy 2022 (November 23, 2022): 1–14. http://dx.doi.org/10.1155/2022/8821192.
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The increasing penetration of grid-connected PV rooftops at the distribution level still entails significant technical challenges affecting seriously the power quality indices such as harmonics and voltage fluctuations. Owing to the intermittent nature of renewable resources, the changing incident energy from renewables can generate considerable amounts of harmonics. Moreover, power electronic devices and nonlinear loads that are used frequently in the industry may exaggerate the harmonic distortions as well. Accordingly, utilizing suitable filtration techniques for harmonic reduction is crucial. In order to evaluate the impacts of grid-connected PVs in modern grids, a case study on power quality and voltage profile is conducted with a large grid-connected PV microgrid of 9570 kW, feeding a large hospital project in Saudi Arabia as an initial phase of implementing this project in the future. For eliminating the possible increase in harmonic distortion, a single-tuned filter is used to cope with the permissible limits according to the known IEEE standards. This filtering technique is chosen due to its advantages including the simplicity, suitability for significant integer harmonic orders, and low cost. For evaluation tests, a detailed simulation is developed by the ETAP program for the overall selected project as well as the aimed PV subsystem. Several simulation tests are conducted to investigate the harmonic distortion problem. The results show a significant reduction in the individual harmonic distortion (IHD) and the total harmonic distortion (THD) below 8% according to considered IEEE standards for LV networks. Both 6 and 12 pule inverters are considered. This is considered an important step in the realization of such large PV projects in the field.
11
Yatim, M. H., A. Ponniran, A. A. Bakar, A. N. Kasiran, K. R. Noor, and J. N. Jumadril. "Analysis of Symmetric and Asymmetric Multilevel Inverter Topologies Using Reduced Number of Switching Devices Circuit Structure." International Journal of Engineering & Technology 7, no. 4.30 (2018): 234. http://dx.doi.org/10.14419/ijet.v7i4.30.22127.
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This paper presents symmetric and asymmetric multilevel inverter principles using reduced number of switching devices circuit structure. Principally, asymmetric multilevel inverter topology able to produce higher output voltage level without modification of the structure in order to reduce total harmonic distortion at the output voltage. In contrast, the number of switching devices need to be increased with symmetric principle when higher output voltage level is considered. In this study, 5-level reduced number of switching devices circuit structure is selected as a circuit configuration for symmetric (5-level structure) and asymmetric (7-level and 9-level structures) multilevel inverters. For switching strategy, modified pulse width modulation and sinusoidal pulse width modulation are selected to produce output voltage levels of the inverter. Modified pulse width modulation 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. Theoretically, total harmonic distortion is reduced when number of output voltage level is increased for both cases. The findings show that, the 9-level asymmetric topology has lower total harmonic distortion compared to the 5-level symmetric topology and 7-level asymmetric topology, whereby these inverters using the same circuit configuration. The results show that, the total harmonic distortions of 9-level asymmetric topology, 7-level asymmetric topology and 5-level symmetric topology are 14.54%, 18.08% and 26.92%, respectively with sinusoidal pulse width modulation switching strategy. Meanwhile, with modified pulse width modulation switching strategy, the total harmonic distortions of 9-level asymmetric topology, 7-level asymmetric topology and 5-level symmetric topology are 18.7%, 21.68% and 28.99%, respectively. Therefore, 9-level asymmetric with sinusoidal pulse width modulation switching strategy show the lowest total harmonic distortion with optimum number of switching devices.
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Narayanan, Ram, Kyle Gallagher, Gregory Mazzaro, Anthony Martone, and Kelly Sherbondy. "Hardware Design of a High Dynamic Range Radio Frequency (RF) Harmonic Measurement System." Instruments 2, no. 3 (2018): 16. http://dx.doi.org/10.3390/instruments2030016.
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Radio frequency (RF) circuit elements that are traditionally considered to be linear frequently exhibit nonlinear properties that affect the intended operation of many other RF systems. Devices such as RF connectors, antennas, attenuators, resistors, and dissimilar metal junctions generate nonlinear distortion that degrades primary RF system performance. The communications industry is greatly affected by these unintended and unexpected nonlinear distortions. The high transmit power and tight channel spacing of the communication channel makes communications very susceptible to nonlinear distortion. To minimize nonlinear distortion in RF systems, specialized circuits are required to measure the low level nonlinear distortions created from traditionally linear devices, i.e., connectors, cables, antennas, etc. Measuring the low-level nonlinear distortion is a difficult problem. The measurement system requires the use of high power probe signals and the capability to measure very weak nonlinear distortions. Measuring the weak nonlinear distortion becomes increasingly difficult in the presence of higher power probe signals, as the high power probe signal generates distortion products in the measurement system. This paper describes a circuit design architecture that achieves 175 dB of dynamic range which can be used to measure low level harmonic distortion from various passive RF circuit elements.
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Gyaang, Raymond, and Patrick Appiah. "Harmonic injection of domestic nonlinear loads in Ghana's power distribution system: analysis and mitigation using a low-cost notch filter." Journal of the Ghana Institution of Engineering (JGhIE) 23, no. 2 (2023): 25–33. http://dx.doi.org/10.56049/jghie.v23i2.81.
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Due to global efforts to save energy, digital light processing (DLP) and direct view televisions (DVTVs) are being replaced by energy-efficient liquid crystal display (LCD) and light emitting diode (LED) televisions. However, these energy-efficient appliances cause harmonics to be injected into the power distribution system, posing a threat to power quality. This study investigates the harmonics generated by common domestic appliances, particularly LCD and LED TVs used in homes in Ghana. Field harmonic measurements were taken using a C.A. 8335 Power Quality Analyzer at a selected facility and were then replicated in a simulation using MATLAB/SIMULINK to model the facility's area network capacity of 100-kVA, 11kV/433V. The study proposes a notch filter as a harmonic mitigation technique, which is integrated into the simulation design and found to be effective at reducing total harmonic distortion current to 0.05 % when applied in parallel to nonlinear loads. The study also compares the harmonic distortion generated by LED TVs and LCD TVs, finding that both types generate high levels of distortion.
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Blanco, Ana Maria, Sergey Yanchenko, Jan Meyer, and Peter Schegner. "Impact of supply voltage distortion on the current harmonic emission of non-linear loads." DYNA 82, no. 192 (2015): 150–59. http://dx.doi.org/10.15446/dyna.v82n192.48591.
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<p>Electronic devices have a non-linear characteristic and emit harmonics into the low voltage grid. Different harmonic studies analyze their impact on the grids based on different types of harmonic models. The most used model is the constant current source. Measurements have shown that the harmonic currents emitted by electronic devices depend on the circuit topology and the existing supply voltage distortion. This paper quantifies the impact of supply voltage distortion on the harmonic current emission of individual devices and the summation of multiple devices. After a classification of the commonly used circuit topologies a time-domain model is developed for each of them. Then the individual and combined impact of voltage harmonics on the harmonic current emission of the modeled devices is analyzed based on simulations. Finally the impact of voltage distortion on the summation of multiple devices is analyzed and the accuracy of constant current source models is evaluated.</p>
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Almaita, Eyad. "Harmonic Assessment in Jordanian Low-Voltage Electrical Power Grid." EARTH SCIENCES AND HUMAN CONSTRUCTIONS 1 (April 8, 2021): 25–29. http://dx.doi.org/10.37394/232024.2021.1.4.
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With the proliferation of nonlinear loads in the power system, harmonic pollution becomes a serious problem that affects the power quality in both transmission and distribution systems. Understanding and quantifying the harmonics level in electrical power grid are crucial before proposing any successful method for mitigating harmonics problems in the grid. In this paper, the harmonics level in Jordan Low-Voltage Electrical Power Grid (JLVEPG) is investigated. The loads are divided into five categories: : (i) industrial loads, (ii) commercial loads, (iii) hospital loads, (iv) residential loads, and (v) office loads. Assuming each category will inject similar harmonics in the grid, this will make the harmonic assessment in the power system is easier and help proposing harmonic mitigation solutions. A field measurement for the major electrical units (Voltages, currents, and power) in JLVEPG is carried out for different locations in multiple cities. These measurements are followed by data analysis techniques in order to identify the total harmonic distortion (THD) and the most dominant harmonic in each load category.
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Aboadla, Ezzidin Hassan, Sheroz Khan, Mohamed H. Habaebi, et al. "A novel optimization harmonic elimination technique for cascaded multilevel inverter." Bulletin of Electrical Engineering and Informatics 8, no. 2 (2019): 405–13. http://dx.doi.org/10.11591/eei.v8i2.1500.
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The main goal of utilizing Selective Harmonic Elimination (SHE) techniques in Multilevel Inverters (MLI) is to produce a high-quality output voltage signal with a minimum Total Harmonic Distortion (THD). By calculating N switching angles, SHE technique can eliminate (N-1) low order odd harmonics of the output voltage waveform. To optimized and obtained these switching angles, N of nonlinear equations should be solved using a numerical method. Modulation index (m) and duty cycle play a big role in selective harmonic elimination technique to obtain a minimum harmonic distortion and desired fundamental component voltage. In this paper, a novel Optimization Harmonic Elimination Technique (OHET) based on SHE scheme is proposed to re-mitigate Total Harmonic Distortion. The performance of seven-level H-bridge cascade inverter is evaluated using PSIM and validated experimentally by developing a purposely built microcontroller-based printed circuit board.
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Ezzidin, Hassan Aboadla, Khan Sheroz, H. Habaebi Mohamed, et al. "A novel optimization harmonic elimination technique for cascaded multilevel inverter." Bulletin of Electrical Engineering and Informatics 8, no. 2 (2019): 405–13. https://doi.org/10.11591/eei.v8i2.1500.
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The main goal of utilizing Selective Harmonic Elimination (SHE) techniques in Multilevel Inverters (MLI) is to produce a high-quality output voltage signal with a minimum Total Harmonic Distortion (THD). By calculating N switching angles, SHE technique can eliminate (N-1) low order odd harmonics of the output voltage waveform. To optimized and obtained these switching angles, N of nonlinear equations should be solved using a numerical method. Modulation index (m) and duty cycle play a big role in selective harmonic elimination technique to obtain a minimum harmonic distortion and desired fundamental component voltage. In this paper, a novel Optimization Harmonic Elimination Technique (OHET) based on SHE scheme is proposed to re-mitigate Total Harmonic Distortion. The performance of seven-level H-bridge cascade inverter is evaluated using PSIM and validated experimentally by developing a purposely built microcontroller-based printed circuit board.
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Buccella, Concettina, Maria Gabriella Cimoroni, and Carlo Cecati. "General Formula for SHE Problem Solution." Energies 13, no. 14 (2020): 3740. http://dx.doi.org/10.3390/en13143740.
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This paper considers cascaded H-bridges multilevel inverters with 2 n dc sources, n integer, n > 0 and proposes a new general formula to compute those 2 n switching angles capable of eliminating n + 1 harmonics and their respective multiples from the output voltage waveform. The proposed procedure uses only scalar products and avoids linear systems, therefore it has a low computational cost. Computed angles do not depend on modulation index, moreover, voltage sources vary linearly. A mathematical proof is given to validate the formula. Three-phase implementations eliminate or mitigate a significant amount of low order harmonics, thus resulting in very low total harmonic distortion. The proposed formula has been experimentally validated using a single-phase nine-level cascaded H-bridge inverter prototype, resulting in a Total Harmonic Distortion (THD) of 5.59%; the first not-mitigated harmonic is the 17th.
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Cadena-Zarate, Cristian, Juan Caballero-Peña, and German Osma-Pinto. "Simulation-based probabilistic-harmonic load flow for the study of DERs integration in a low-voltage distribution network." AIMS Electronics and Electrical Engineering 8, no. 1 (2024): 53–70. http://dx.doi.org/10.3934/electreng.2024003.
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<abstract><p>The integration of distributed energy resources (DERs) and, therefore, power electronic devices into distribution networks leads to harmonic distortion injection. However, studying harmonic distortion solely through deterministic approaches presents challenges due to the inherent random behavior of DERs. This study introduced a strategy that leverages PowerFactory's harmonic load flow tool. By combining it with Python co-simulation, probabilistic load flows can be developed. These load flows utilize current sources to represent harmonic distortion emitters with predefined harmonic spectra. The proposed strategy was implemented on a real network, where two different capacities of DERs were integrated at various locations within the network. The distributions for the total harmonic distortion of voltage ($ THD_{v} $) and the total harmonic distortion of current ($ THD_{i} $) were obtained 24 hours a day in nodes and lines of the network. The procedure allowed considering the uncertainty associated to the DERs integration in distribution networks in the study of harmonic distortion, which, speaking from a simulation approach, is scarce in the literature.</p></abstract>
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Aljwary, Adel, Ziyodulla Yusupov, Olimjon Toirov, and Rustam Shokirov. "Mitigation of load side harmonic distortion in standalone photovoltaic based microgrid." E3S Web of Conferences 304 (2021): 01010. http://dx.doi.org/10.1051/e3sconf/202130401010.
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Photovoltaic (PV) system as one part of distributed energy resources is becoming an alternative for low and medium distribution network of microgrid. By the reason of a wide implementation of power electronic and non-linear loads, harmonics distortion is one of the main problems for the power systems. There are several filter types to mitigate the harmonics. The passive filter is distinguished by its simplicity and economical options from another filters. In this paper, the passive single tuned filter (STF) is used to minimize harmonics distortion in standalone PV based microgrid. A solar PV array is modelled as an ideal single diode model (ISDM) and used to supply electrical power to an AC load. The simulation results are executed on MATLAB/Simulink show that STF is effective in mitigating the voltage total harmonic distortion (VTHD) and the current total harmonic distortion (ITHD) with enhancing the output power quality.
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Yatim, M. H., A. Ponniran, M. A. Zaini, et al. "Symmetrical and Asymmetrical Multilevel Inverter Structures with Reduced Number of Switching Devices." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 1 (2018): 144. http://dx.doi.org/10.11591/ijeecs.v11.i1.pp144-151.
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The purpose of this study is to analyze the operation and design of symmetrical and asymmetrical multilevel inverter structures with reduced number of switching devices. In this study, the term of conventional inverter is defined as a single cascaded inverter. Specifically, the inverter operates in three complete loops and only produces 2-level and 3-level of output voltages. Usually, cascaded structure suffers from the high total harmonic distortion. Thus, by considering multilevel structure of inverter, low total harmonic distortion reduction and voltage stress reduction on switching devices can be archived. Sinusoidal pulse width modulation and modified square pulse width modulation are used as modulation techniques in switching schemes of the designed multilevel inverters. The findings indicate that, the designed multilevel structure cause low total harmonics distortion at the output voltage. Furthermore, the asymmetrical structure is producing the same output voltage levels with reduced number of switching devices compared to the symmetrical structure is experimentally confirmed. The findings show that the total harmonic distortion for 7-level (symmetrical) and 9-level (asymmetrical) are 16.45% and 15.22%, respectively.
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M., H. Yatim, Ponniran A., A. Zaini M., et al. "Symmetrical and Asymmetrical Multilevel Inverter Structures with Reduced Number of Switching Devices." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 1 (2018): 144–51. https://doi.org/10.11591/ijeecs.v11.i1.pp144-151.
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The purpose of this study is to analyze the operation and design of symmetrical and asymmetrical multilevel inverter structures with reduced number of switching devices. In this study, the term of conventional inverter is defined as a single cascaded inverter. Specifically, the inverter operates in three complete loops and only produces 2-level and 3-level of output voltages. Usually, cascaded structure suffers from the high total harmonic distortion. Thus, by considering multilevel structure of inverter, low total harmonic distortion reduction and voltage stress reduction on switching devices can be archived. Sinusoidal pulse width modulation and modified square pulse width modulation are used as modulation techniques in switching schemes of the designed multilevel inverters. The findings indicate that, the designed multilevel structure cause low total harmonics distortion at the output voltage. Furthermore, the asymmetrical structure is producing the same output voltage levels with reduced number of switching devices compared to the symmetrical structure is experimentally confirmed. The findings show that the total harmonic distortion for 7-level (symmetrical) and 9-level (asymmetrical) are 16.45% and 15.22%, respectively.
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Kangaji, Ladislas Mutunda, Lagouge Tartibu, and Pitshou N. Bokoro. "Modelling and Performance Analysis of a Tidal Current Turbine Connected to the Grid Using an Inductance (LCL) Filter." Energies 16, no. 16 (2023): 6090. http://dx.doi.org/10.3390/en16166090.
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Nowadays, integrating renewable energy sources, such as tidal power, into the existing power grids of turbines is crucial for sustainable energy generation. However, tidal turbine energy transforms the potential energy of moving water into electrical energy. When both nonlinear load and dynamic load harmonics are present, the tide speed variance causes serious power quality issues such as low power factor, unstable voltage, harmonic distortions, frequency fluctuations, and voltage sags. The integration of an LCL-filter-based connection scheme can address these challenges by improving power quality and the overall performance of the tidal current turbine grid system. This study shifts LCL filter research from its conventional wind energy emphasis to the emerging field of tidal stream generation systems. The LCL filter analysed in this paper is modelled to exhibit adequate mechanical, electrical, and hydrodynamic characteristics. This model accounts for tidal current variations, turbine speed control, and power extraction dynamics. The LCL filter is evaluated for its effectiveness in reducing harmonic distortions, voltage fluctuations, and reactive power fluctuations. This system is composed of a 1.5 MW/C, a 1.2 MW three-level inverter with a nominal voltage of 600 V, and an inductance (LCL) filter. The results show that the inverter produces a harmonic distortion of less than 0.5%, which demonstrates the effectiveness of the filter in improving total harmonic distortion, reactive power consumption, and voltage control.
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Toprak, Yusuf, Oktay Karakaya, Şevket Cantürk, and Murat Balcı. "DESIGN OF PASSIVE HARMONIC FILTER FOR THE CLAW-POLE SYNCHRONOUS GENERATORS UNDER NON-LINEAR LOADING." İstanbul Ticaret Üniversitesi Fen Bilimleri Dergisi 24, no. 47 (2025): 284–302. https://doi.org/10.55071/ticaretfbd.1600837.
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In this study, firstly, the harmonic distortions of terminal voltage and current of a three-phase 1,5 kVA, 150V, 50 Hz, and four poles permanent magnet excited Claw Pole Synchronous Generator (CPSG) supplying a 6-pulse rectifier load are simulated using its 3D Finite Element Model (FEM) in Ansys Maxwell software environment. Then, various low-pass passive filters are designed with a practical approach to reduce the terminal voltage and winding current harmonics in the analysis system. Finally, the terminal voltage and current harmonic distortions, losses, torque oscillations, and efficiency of the modelled CPSG are evaluated when the designed filter is connected to the system. According to the numerical results obtained, the best-performing filter among the designed ones is determined. It is also concluded that with the help of this best-performing filter, the terminal voltage harmonic distortion, losses, torque oscillations, and efficiency of the CPSG are considerably improved.
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Adjie, Alfin Prima, and Muhammad Imran Hamid. "Harmonics Analysis of Input Current of 3-Phase PWM Rectifier." Andalas Journal of Electrical and Electronic Engineering Technology 1, no. 1 (2021): 31–40. http://dx.doi.org/10.25077/ajeeet.v1i1.6.
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Rectifier is a non-linier load that causes harmonic distortion in the power system. Pulse-width modulation (PWM) method is an effective method in pressing the magnitude of harmonics in a rectifier application, it provides an almost sinusoidal input current. However, the variation of loads that supplied by a rectifier cause the harmonics that arise can still beyond the applicable standard. The amount of harmonics in the operating range of a rectifier need to be identified to determine the filter on the input side. In this research article, 3-phase PWM rectifier was designed with hysteresis current control technique using PSCAD software simulation. Harmonic compensation was carried out by applying an active filter based on P-Q theory to reduce the harmonic distortion that occurs in the input current, thus giving a low total harmonic distortion (THD) value. Based on the simulation, 3-phase PWM rectifier operation starting at a power level of 150 kW, giving a THD value above 5-10% by the increasing the amount of load supplied by the rectifier. The application of active filter based on the P-Q theory is able to compensate harmonics in the input current wave with a THD value below 5% in the rectifier operating range.
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Lipták, Róbert, and István Bodnár. "Effects of photovoltaic systems on the behavior of harmonic components in low voltage network." Analecta Technica Szegedinensia 17, no. 2 (2023): 32–47. http://dx.doi.org/10.14232/analecta.2023.2.32-47.
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Renewable energy sources, especially solar systems, have become increasingly important energy sources in recent times. Connecting large PV systems to utility networks can cause a number of operational problems for distribution networks. The extent of these problems depends directly on the percentage of PV penetration and the geographical location of the installation. Possible problems caused by PV systems: over-voltage, output power fluctuation, harmonic distortion, frequency fluctuation
 Harmonic distortion is a serious energy quality problem which can occur in photovoltaic systems due to the use of power inverters that convert direct current to alternating current. The resulting harmonics can cause parallel and series resonances, transformer overheating, and protection device malfunctions, which can reduce the reliability of power supply systems.
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Chen, K. C., S. Salimin, S. A. Zulkifli, and R. Aziz. "Single Phase Inverter System using Proportional Resonant Current Control." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 4 (2017): 1913. http://dx.doi.org/10.11591/ijpeds.v8.i4.pp1913-1918.
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<span>This paper presents the harmonic reduction performance of proportional resonant (PR) current controller in single phase inverter system connected to nonlinear load. In the study, proportional resonant current controller and low pass filter is discussed to eliminate low order harmonics injection in single phase inverter system. The potential of nonlinear load in producing harmonics is showed and identified by developing a nonlinear load model using a full bridge rectifier circuit. The modelling and simulation is done in MATLAB Simulink while harmonic spectrum results are obtained using Fast Fourier Transfor. End result show PR current controller capability to overcome the injection of current harmonic problems thus improved the overall total harmonic distortion (THD).</span>
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Chakraborty, Meenakshi, and Taraprasad Chattopadhyay. "Total Harmonic Modulation Distortion of an Injection-Locked Fabry-Perot Laser Diode Directly Modulated by a Multi-harmonic RF Signal." International Journal of Engineering & Technology 7, no. 4.5 (2018): 309. http://dx.doi.org/10.14419/ijet.v7i4.5.20095.
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This paper describes effects of low-level light injection into a directly modulated Fabry-Perot laser diode on the external total harmonic modulation distortion when the external fundamental modulating signal is multi-harmonic contaminated. Necessary theory of the injected FPLD has been developed and an expression for total harmonic distortion of the modulating signal has been derived considering low-level light injection. The total harmonic modulation distortion has been experimentally measured for the RF modulation source and for the injection-locked slave FPLD output after photodetection.
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Zhang, Hong Juan, and Yong Xing Hou. "The Study on Harmonic Characteristics of Three-Phase SPWM Inverter." Applied Mechanics and Materials 117-119 (October 2011): 1779–83. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.1779.
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Through using dual Fourier transform quantitative analysis and harmonic loss calculation on the output voltage of three phase voltage-Sinusoidal Pulse Width Modulation (SPWM) inverter, a valid harmonic inhibition scheme is presented. Carrier frequency is reasonably selected to eliminate low times harmonics, harmonics of carrier frequency times and triple frequency sideband. Analysis of fast Fourier transform is achieved in MATLAB. Simulation results show that harmonics are effectively inhibited, output voltage waveform is improved and voltage distortion factor is decreased from1.16% to 0.71%.
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Platonova, E. V., A. S. Toropov, A. V. Kolovsky, and V. Yu Shcherbachevich. "Modeling non-linear loads for low-voltage electric grids." Journal of Physics: Conference Series 2697, no. 1 (2024): 012075. http://dx.doi.org/10.1088/1742-6596/2697/1/012075.
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Abstract The authors performed the computer modeling of a power distribution grid section comprising a significant non-linear and asymmetric household and office load. The modeling was performed using the SimInTech software. The developed model was used to study the impacts that non-linear single-phase consumers (e.g. computers, printers, TV sets, microwave ovens, etc) have on the distortion of current and voltage curves in the grid and the formation of current in the transformer neutral. The authors demonstrate the dependency between the higher harmonic values of the phase and transformer neutral currents and the total non-linear consumer power, their share in the overall power substation load, and the distribution of non-linear consumer load across the substation feeders. To reduce the level of harmonic current components, the authors suggest using narrow-band passive higher harmonic filters. A computer model was developed for the simultaneous operation of a single-phase non-linear load and a four-link filter compensating device that comprises the filters set for the frequencies of the third, fifth, seventh, and ninth harmonics. The analysis of the non-sinusoidal operating modes of the grids with -harmonic filters connected showed that there is practically no current in the neutral while the distortion factors of the phase currents and grid voltage curves are at the minimum.
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Wu, Lubin, Ziquan Liang, Weihua Li, and Xiaoteng Wang. "Harmonic Suppression Strategy in Single-phase SPWM Based on Mixed Integer Nonlinear Programming." Modern Applied Science 13, no. 5 (2019): 22. http://dx.doi.org/10.5539/mas.v13n5p22.
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In single-phase bipolar SPWM inverter circuit, the output voltage contains high content of harmonic components. To solve this problem, we build a model of output voltage in single-phase SPWM bipolar inverter based on SPWM theory and Fourier series theory. Through theoretical analysis, calculation and plotting, we work out the distribution of harmonic in output voltage, investigate the relationship between amplitude modulation (AM) depth and harmonic components and finally determine a proper amplitude modulation depth to efficiently reduce harmonic components. To further reduce harmonic components of output voltage, we use LC low-pass filter. Then, based on the mathematical model of the filter and the distribution law of harmonics, we establish a mixed integer nonlinear programming to fully suppress harmonics and reduce switching losses. After searching for two times based on genetic algorithm, we work out the best frequency-modulation ratio and LC low-pass filter parameter. Finally in simulation, total harmonic distortion is reduced from 213.47 percent to 0.16 percent after harmonic suppression strategy implemented. The result has proved the effectiveness of the harmonic suppression strategy we applied, which can be used as a reference for output voltage harmonic elimination in single-phase SPWM inverter.
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Onal, Yasemin. "Analysis of a new SEPIC AC–DC PFC converter for light emitting diode applications." Emerging Materials Research 11, no. 1 (2022): 51–59. http://dx.doi.org/10.1680/jemmr.21.00061.
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Active power factor correction (PFC) converters are used to increase the power factor and improve the total harmonic distortion as a result of reducing the harmonics in the current. In this paper, a new bridgeless single-ended primary inductor converter (SEPIC) topology used in light emitting diode (LED) load is proposed to obtain near-unity power factor. By eliminating the input bridge in the bridge PFC converter, the total harmonics distortion is improved and a lower cost is obtained. The reactive power control is used to generate the reference current signal in the proposed converter to control the LED current. To demonstrate the applicability of the proposed topology and to compare its performance with the bridge SEPIC topology, PSIM circuit simulation was used, and an experimental prototype was performed. In the experimental study, 25 Vrms input voltage was applied, and 10 V DC voltage was obtained at the output. Using the proposed converter, the total harmonic distortion value was reduced from 5.722% to 1.837%, and the power factor was increased to 0.999. The experimental and simulation results showed that the total harmonic distortion value of the input current improved and that the proposed SEPIC PFC converter for low-power circuits, particularly in LED applications, is a very good option.
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Khine, Zar Maw. "Design of Active Filter for Reducing Harmonic Distortion in Distribution Network." International Journal of Trend in Scientific Research and Development 3, no. 5 (2019): 1461–66. https://doi.org/10.5281/zenodo.3590927.
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Power transmission and distribution systems are designed for operation with sinusoidal voltage and current waveform in constant frequency. Power electronic control devices due to their inherent non linearity draw harmonic and reactive power form the supply mains. The wide use power electronic equipment with linear load causes an increasing harmonics distortion in the ac mains currents. Harmonics component is a very serious and harmful problem in the distribution system. The main adverse effects of harmonic current and voltage on power system equipment are overheating, overloading, perturbation of sensitive control and electronic equipment, capacitor failure, communication interferences, process problem, motor vibration, resonances problem and low power factor. This paper describes the modelling of active filter with synchronous d q reference frame theory for harmonic compensation in distribution systems. The case study is carried out at Hlaingtharyar township distribution system. The model is implemented for harmonic analysis from simulation using a Matlab Simulink with the THD values obtained by practical measurement. Khine Zar Maw "Design of Active Filter for Reducing Harmonic Distortion in Distribution Network" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd26663.pdf
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Liang, Jian, Shuang Zhang, Yong Ren, and Yuanchu Cheng. "Harmonics Current Detection in Three-phase Circuit using Neural Network." Journal of Physics: Conference Series 2242, no. 1 (2022): 012043. http://dx.doi.org/10.1088/1742-6596/2242/1/012043.
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Abstract Harmonics seriously affect the safety and economy of power system. In order to control harmonics effectively, harmonic current and harmonic power must be detected quickly. Based on the analysis of the components of three-phase nonlinear current, a neural network detection method of fundamental and harmonic current in three-phase circuit is proposed. The method uses a neural network instead of the low-pass filter in the instantaneous reactive power theory. The example results show that the proposed method has the advantages of less computation, better real-time performance and high detection accuracy. The method can be used to detect the positive-sequence (negative-sequence) fundamental active current, positive-sequence (negative-sequence) fundamental reactive current, harmonic, distortion current and harmonic power.
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Kishore, B., Senbakaraj, Periyasamy, and Poongkabilan. "THD Reduction in Multi-Level Inverters based on Multicarrier Pulse Width Modulation Technique." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 4 (2020): 1970–77. https://doi.org/10.35940/ijeat.D8994.049420.
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Due to the advent of technology, electronic equipments are much more sensitive to harmonic and its analysis play an important role whereby reducing the distortion due to harmonics needs attention. To meet the requirements of the industries, harmonic free-high rating power sources are in high demand. Total Harmonic Distortion (THD) is an indicator of AC voltage source quality. In case of inverters, one such way to reduce THD would be the use of Pulse Width Modulation (PWM). The existing methods mainly use the low frequency pulse width modulation techniques for the switching. Control methods employing high frequency switching techniques held in controlling THD with proper application of filters. This paper analyses THD in multilevel inverters using multicarrier PWM technique with five pulse width modulation technique through MATLAB simulations. Finally, a comparison is done to find the less harmonic generated PWM method using fewer filters
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Kandil, Shaimaa A., A. A. Ali, Adel El Samahy, Sherif M. Wasfi, and O. P. Malik. "Harmonic Optimization in Voltage Source Inverter for PV Application using Heuristic Algorithms." International Journal of Emerging Electric Power Systems 17, no. 6 (2016): 671–82. http://dx.doi.org/10.1515/ijeeps-2016-0052.
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Abstract Selective Harmonic Elimination (SHE) technique is the fundamental switching frequency scheme that is used to eliminate specific order harmonics. Its application to minimize low order harmonics in a three level inverter is proposed in this paper. The modulation strategy used here is SHEPWM and the nonlinear equations, that characterize the low order harmonics, are solved using Harmony Search Algorithm (HSA) to obtain the optimal switching angles that minimize the required harmonics and maintain the fundamental at the desired value. Total Harmonic Distortion (THD) of the output voltage is minimized maintaining selected harmonics within allowable limits. A comparison has been drawn between HSA, Genetic Algorithm (GA) and Newton Raphson (NR) technique using MATLAB software to determine the effectiveness of getting optimized switching angles.
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Zheng, Shi Sheng, Yong Jun Zhang, and Yong Kang Zhang. "A Chaotic Carrier Frequency SVPWM Strategy to Reduce the Harmonic Distortion." Applied Mechanics and Materials 494-495 (February 2014): 1577–81. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1577.
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Harmonics always have a negative impact on control precision and grid quality. It has been found out that harmonic distribution is very germane to carrier frequency. Based on the analysis of conventional SVPWM, in this paper a chaotic carrier frequency SVPWM strategy is proposed, where the theory of chaos is applied to generate the desired random source for SVPWM carrier frequency. Simulation result proves that chaotic carrier frequency SVPWM can not only improve the waveform quality, reduce the low-order harmonics, and also flatten the high-order harmonics effectively.
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Chu, K. H., and C. Pollock. "PWM-controlled series compensation with low harmonic distortion." IEE Proceedings - Generation, Transmission and Distribution 144, no. 6 (1997): 555. http://dx.doi.org/10.1049/ip-gtd:19971537.
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Molinar-Solis, Jesus E., Ivan Padilla-Cantoya, Juan J. Ocampo-Hidalgo, Sergio Sandoval-Perez, and Jose Rivera-Mejia. "CMOS Tunable Pseudo-Resistor with Low Harmonic Distortion." Electronics 12, no. 16 (2023): 3376. http://dx.doi.org/10.3390/electronics12163376.
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In this work, a tunable pseudo-resistor was designed, simulated, and tested using a 0.35 µm CMOS technology. The proposal used a compact voltage bias circuit free of body-effect, allowing a constant resistance value over the pseudo-resistor’s dynamic range, improving its linearity. A fabricated cell was characterized providing a resistance value from 300 kΩ to 10 GΩ with a THD from <2.5% to 1 GΩ. Additionally, the pseudo-resistor was incorporated into a high-pass OTA filter showing a THD below 0.2% for input voltages in the range ≤ 0.3 Vp. The simulations were compared with experimental measurements in a CMOS-fabricated cell, which verified the proposal’s feasibility.
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Hachemi, Glaoui, Harrouz Abdelkader, and Dehini Rachid. "Optimal Sizing of Passive Filters for Typical Industrial Power Systems." Applied Mechanics and Materials 905 (February 15, 2022): 65–77. http://dx.doi.org/10.4028/p-u37f6q.
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Because of The low complexity of passive filters (PF) compared to the active filter, their high efficiency, their ease of installation and their different topologies,theyremained the devices required in the power system. In order to minimize the harmonic distortion produced by the large industrial loads, harmonic filters should, therefore, be designed with the utmost rigor, because a poorly designed filter may amplify the undesired harmonics. The determination of the PFcomponents requires both adetailed study ofthe power system parameters, which influence the efficiency and economic viability of the harmonic compensation and the reactive power required by the load.This article studies the use of the Cuckoo optimization algorithm (COA), in order to designpassive filters with an improved power quality and reduced cost. The optimal filters are connected concurrently to the power system so that each individual Harmonic distortion respects the recommended limits. The results show that the optimized (PF) is effective, and has a lower cost.
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Kim, Gipyo, Hyunjae Lee, and Jingeun Shon. "Enhanced Harmonic Reduction and Voltage Utilization Ratio Improvement in ANPC Inverters Using an Advanced Hybrid SVPWM Technique." Energies 18, no. 7 (2025): 1868. https://doi.org/10.3390/en18071868.
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This paper proposes an Advanced Hybrid SVPWM (Space Vector Pulse Width Modulation) technique that integrates the benefits of RPS-PWM (Reference Point Saturation-Based PWM) and SVPWM to enhance the performance of three-level ANPC (Active Neutral Point Clamped) inverters. While RPS-PWM effectively reduces switching harmonics, it suffers from lower voltage utilization. In contrast, SVPWM achieves higher voltage utilization but struggles with harmonic suppression. The proposed Advanced Hybrid SVPWM technique addresses these limitations by maintaining the voltage utilization level of RPS-PWM while significantly reducing harmonic distortion and increasing the output Vrms. To validate the effectiveness of the proposed method, comprehensive PSIM simulations and DSP-based hardware experiments were conducted. Experimental results confirm that the Advanced Hybrid SVPWM achieves superior harmonic suppression compared to conventional RPS-PWM and SVPWM, while also delivering improved output voltage characteristics. These findings highlight the potential of the proposed technique for enhancing the performance of power electronic systems requiring high efficiency and low harmonic distortion.
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Anusha, M., and D. Shobha Rani. "A New Standalone Photovoltaic Inverter Configuration with Low Harmonic Distortion under the Partially Shaded Condition." E3S Web of Conferences 564 (2024): 05007. http://dx.doi.org/10.1051/e3sconf/202456405007.
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This paper proposes a new standalone photovoltaic (PV) inverter topology for optimal solar power usage, which includes a new maximum power point tracking (MPPT) technique based on shading pattern analysis utilizing an adaptive neuro-fuzzy inference system (ANFIS), SIMO converter, and multilayer inverter (MLI). The suggested MPPT scheme is tested in partially shaded conditions. The PV voltage is then sent to the SIMO converter, which generates four distinct voltages (V1, V2, V3, and V4). The MLI reduces harmonic distortion by converting the SIMO converter’s dc output voltage to ac. Artificial Neural Networks (ANN) are employed in traditional systems to reduce harmonic distortion by 3.24 %. Photovoltaic inverter configuration using ANFIS is proposed in this paper. The ANFIS reduces overall harmonic distortion by 2.04 %, which is significantly better than the ANN. This MLI has eight switching devices and delivers 31-level ac output voltage with very low harmonic distortion. The particle swarm optimization (PSO), MPPT scheme harvests maximum power in any weather condition, and MLI feeds the utility, which is a key aspect, linked with the proposed topology. The performance of the MLI and converter is programmed using an FPGA Spartan trainer kit.
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El-Ela, Adel Abo, Ragab El-Sehiemy, Sohir M. Allam, and Asmaa Adel Mubarak. "Optimal sizing and siting of single tunned passive filter based on jellyfish algorithm." Energy Technologies and Environment 2, no. 2 (2024): 37–48. http://dx.doi.org/10.58567/ete02020002.
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<p class="MsoNormal" style="margin-top: 10pt; text-align: justify;"><span lang="EN-US" style="font-family: 'times new roman', times, serif; font-size: 14pt;">The presence of electrical harmonics in low voltage networks causes many problems for customers, the most important of which is the decrease in the power quality beyond the permissible limits, which leads to a decrease in voltage for long periods, a decrease in power factor and a large losses in the electrical network due to the deformation of the electric waveform of voltage and current. The aim of this paper is to design an optimal passive filter and its optimal location to suppress the harmonic distortion in the distribution system that results from nonlinear loads. This filter will use single objective functions and multi objective functions that will minimize the proposed filter cost, the real power losses, total harmonic distortion "THD" and individual harmonic distortion "IHD". This will be done under the equality constraint of power balance and some inequality constraints such as filter parameters limits, quality factor limits, voltage limits, harmonic distortion limits. The optimal passive filter parameters and location will be calculated using the modern optimization techniques such jellyfish optimization technique. IEEE 33 bus radial system will be used for demonstrating results obtained by the proposed method.</span></p>
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Sasmoko, Priyo, Subali Subali, and Teguh Yuwono. "APLIKASI TAPIS PELEWAT RENDAH LC (LOW PASS LC FILTER) UNTUK MEREDUKSI DISTORSI HARMONISA PADA LAMPU HEMAT ENERGI." Gema Teknologi 16, no. 4 (2012): 177. http://dx.doi.org/10.14710/gt.v16i4.4786.
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Priyo Sasmoko, Subali, Teguh Yuwono, in this paper explain that harmonic (current or voltage) is one of the problems that has to be solved in electric power system, especially that caused by non-linear loads. Harmonic could cause bad impacts for the electric components that sensed it. It is almost certain that using of fluorescent lamp with electronic ballast or it is called energy saving lamp can cause harmonic in electric power system. Considering of the using of energy saving lamp is increased fairly fast as residence and office lighting, so it is important to analyze and solve the harmonic that caused by energy saving lamp. From the harmonic analysis, we can know the harmonic distortion caused by energy saving lamp. And there are some efforts to reduce such harmonic distortion by using a Low Pass Filter. Keyword: power quality, harmonic, low pass filter.
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Zygarlicki, Jarosław, and Janusz Mroczka. "Method of testing and correcting signal amplifiers’ transfer function using prony analysis." Metrology and Measurement Systems 19, no. 3 (2012): 489–98. http://dx.doi.org/10.2478/v10178-012-0042-7.
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Abstract This article presents a way of analyzing the transfer function of electronic signal amplifiers. It also describes the possibility of using signal precorrection which improves the parasitic harmonics in the THD (Total Harmonic Distortion) of the amplified signal by correcting linearity of the tested amplifier’s transfer function. The proposed method of analyzing and presenting the transfer function allows to diagnose the causes of generating parasitic harmonics, what makes it a useful tool when designing low distortion amplifier systems, such as e.g. amplifiers in measurement systems. The presented THD correction can be used in e.g. amplifier systems that cooperate with arbitrary generators.
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Chen, Ming-Hung. "Development of Shunt-Type Three-Phase Active Power Filter with Novel Adaptive Control for Wind Generators." Scientific World Journal 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/963456.
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This paper proposes a new adaptive filter for wind generators that combines instantaneous reactive power compensation technology and current prediction controller, and therefore this system is characterized by low harmonic distortion, high power factor, and small DC-link voltage variations during load disturbances. The performance of the system was first simulated using MATLAB/Simulink, and the possibility of an adaptive digital low-pass filter eliminating current harmonics was confirmed in steady and transient states. Subsequently, a digital signal processor was used to implement an active power filter. The experimental results indicate, that for the rated operation of 2 kVA, the system has a total harmonic distortion of current less than 5.0% and a power factor of 1.0 on the utility side. Thus, the transient performance of the adaptive filter is superior to the traditional digital low-pass filter and is more economical because of its short computation time compared with other types of adaptive filters.
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Song, Pengyun, Yanghui Liu, Tao Liu, Huazhang Wang, and Liwei Wang. "A Novel Suppression Method for Low-Order Harmonics Causing Resonance of Induction Motor." Machines 10, no. 12 (2022): 1206. http://dx.doi.org/10.3390/machines10121206.
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In the motor drive system of electric vehicles, there are some nonlinear factors, such as the deadtime and the conduction voltage drop of switching devices, which will generate low-order harmonics of the stator current and the torque ripple. The frequency of the harmonic may coincide with the natural frequency of the motor, so resonance may occur on the motor drive system. To reduce the noise caused by motor resonance, the characteristics of harmonic distortion caused by the deadtime, and the conduction voltage drop of the switching device, are analyzed firstly. Then, a motor vector control strategy with specific low order is proposed. The sixth-order harmonic resonance controller in d-q axis is introduced into the control loop, and the parameter designing principle of the controller is also presented. Without affecting the control performance of the current loop, the sixth-order harmonic of the stator current near the natural frequency can be significantly suppressed. Finally, the simulation and the experiment are carried out to certify the correctness and effectiveness of the proposed harmonic suppression method.
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Zhang, Bo, Yang Wei Liu, and Bao Jie Liu. "Numerical Simulation of Low Engine Order Excitation in a Transonic Compressor." Advanced Materials Research 546-547 (July 2012): 206–11. http://dx.doi.org/10.4028/www.scientific.net/amr.546-547.206.
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A full-annulus unsteady quasi-3D simulation for a transonic compressor was conducted to investigate the low engine order excitation sources. A special inlet total pressure distortion was used in the simulation to account for the effect of non-axisymmetric tip clearance. The unsteady aerodynamic forces were obtained by integrating the static pressure along the blade surface. Furthermore, the effect of downstream rotor detached shock on upstream stator was analyzed. It was shown that the unsteady aerodynamic excitation of the rotor was subjected to the first two harmonic frequencies of the inlet distortion, and the adjacent stators’ basic frequency and lower harmonics. It was found that the detached shock had a significant impact on the surface static pressure distribution of the upstream stators.
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Kantyukov, Nikita R., Roman V. Kirillov, and Regina T. Khazieva. "EVALUATION OF THE EFFICIENCY OF CONVERSION CIRCUITS FOR ELECTRIC VEHICLE CHARGING STATIONS." Electrical and data processing facilities and systems 21, no. 1 (2025): 61–76. https://doi.org/10.17122/1999-5458-2025-21-1-61-76.
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Relevance With the rapid growth in popularity of electric vehicles and the increasing need for charging infrastructure, evaluating the effectiveness of circuit solutions for charging stations is becoming an increasingly important task. Currently, the development of chargers is required to reduce the charging time of an electric vehicle, increase the efficiency of converting mains voltage to direct current to charge the battery, with high reliability and affordable cost. Aim of research This article discusses various schemes for the implementation of charging stations, in particular, the use of a single-phase converter. The circuits are compared by the values of the transmission coefficients of the filter and harmonic distortion. The higher the value of the transmission coefficient, the more effective the filter is. In turn, a low harmonic distortion coefficient means a low peak current value, less heating of the elements and a low level of electromagnetic interference. Research methods The MatLab/Simulink computer simulation environment was used to determine the transmission coefficient of the filter, as well as the harmonic distortion coefficient. Results As a result of the research, it was found that the best characteristics for use in charging stations are provided by a scheme based on a step-up alternating PFC, with a harmonic distortion coefficient of 1.31 %, which is better than that of a scheme based on a step-up PFC converter with a harmonic distortion coefficient of 2.83 %.
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Calgan, Haris. "Optimal C-type filter design for wireless power transfer system by using support vector machines." An International Journal of Optimization and Control: Theories & Applications (IJOCTA) 13, no. 2 (2023): 151–60. http://dx.doi.org/10.11121/ijocta.2023.1354.
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The rapid increase in the number of Electrical Vehicles (EVs) will bring difficulties in the management of charging process and pose serious grid problems at low voltage levels. Particularly, with employment of wireless power transfer (WPT) system in a charging station, harmonic interference will increase. The main reason of that poor power quality lies on high frequency square wave output of transmitter side of WPT. In this study, a support vector machine (SVM) is proposed to design an optimal C-type passive filter in order to mitigate voltage and current total harmonic distortions (THD) of WPT system. Hereby, SVM-based model is constructed which consists of THD indices and power factor (PF) as outputs whereas filter parameters are inputs. The main aim of optimization process is minimization of distortions and correction of PF while searching the filter parameters. Particle swarm optimization (PSO) algorithm is employed to find the optimal filter parameters. To show the efficiency of proposed method, simulation studies are carried out on Matlab®/SimulinkTM environment. It is observed that voltage total harmonic distortion (THDv) and current total harmonic distortion (THDi) are calculated as 1.03%, 2.23%, respectively, and the power factor is improved to 0.995% when the designed C-type filter is utilized.