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Статті в журналах з теми "Harmonic analysis"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 25 липня 2025

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1

Wu, Shan-He, Imran Abbas Baloch, and İmdat İşcan. "On Harmonically(p,h,m)-Preinvex Functions." Journal of Function Spaces 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/2148529.

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Анотація:

We define a new generalized class of harmonically preinvex functions named harmonically(p,h,m)-preinvex functions, which includes harmonic(p,h)-preinvex functions, harmonicp-preinvex functions, harmonich-preinvex functions, andm-convex functions as special cases. We also investigate the properties and characterizations of harmonically(p,h,m)-preinvex functions. Finally, we establish some integral inequalities to show the applications of harmonically(p,h,m)-preinvex functions.

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2

Zhao, Keyu. "Grid-Connected PV System Harmonic Analysis." MATEC Web of Conferences 404 (2024): 02005. http://dx.doi.org/10.1051/matecconf/202440402005.

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The inverter’s output impedance can be adjusted to reduce harmonic interference on the grid. Advanced current control strategies like PI and quasi-PR control enable precise control of the inverter’s output current, further reducing harmonics. PI control compensates for error signals to eliminate steady-state errors but has limited ability to suppress harmonics in high-frequency ranges. Quasi-PR control combines proportional, integral, and resonance control to suppress specific frequency harmonics. Establishing a grid-connected photovoltaic inverter and harmonic source model is crucial for grid

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3

Zhang, Feng, Jue Long Li, Chong Feng Tian, Zong Jie Liu, Hai Feng Ye, and Xiu Chen Jiang. "Binary Scale Time Windows FFT for Harmonic Analysis." Applied Mechanics and Materials 448-453 (October 2013): 2003–10. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2003.

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Анотація:

Various harmonics exist in the electrical power system, and the harmonics include both integer harmonics and non-integer harmonics. It is hard to analyze all the harmonics accurately. In order to improve the precision of harmonic analysis and the minimum resolution, this paper presents a new algorithm named binary scale time windows FFT based on traditional algorithm.This algorithm considers the calculative time and precision well. The results of the test indicate that this algorithm can both guarantee the accuracy and raise the resolving power in the harmonic analysis without increasing the h

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4

Vijayalakshmi, V. J., C. S. Ravichandran, and A. Amudha. "Predetermination of Higher Order Harmonics by Dual Phase Analysis." Applied Mechanics and Materials 573 (June 2014): 13–18. http://dx.doi.org/10.4028/www.scientific.net/amm.573.13.

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Анотація:

Previous research was mainly concentrated on eliminating the selected lower order harmonics depending on the level of inverter which was assumed to be high. The harmonics may be present even in the higher order also. The analysis of harmonic spectrum by Finite Fourier Transform yields a very accurate result for lower order harmonics. For obtaining accurate Total Harmonic Distortion (THD) value and the harmonic spectrum, inclusion of higher order harmonics is essential. The method for accurate estimation is proposed in this paper. In normal practice, the higher order harmonics present in the ou

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5

Bonilla, Axel Rivas, and Ha Thu Le. "Analysis and Mitigation of Harmonics for a Wastewater Treatment Plant Electrical System." WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS 23 (February 9, 2024): 1–13. http://dx.doi.org/10.37394/23201.2024.23.1.

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Power quality has become a pressing issue that demands solutions as power electronic equipment has been increasingly used in industrial sectors. One critical problem is how to mitigate harmful harmonics generated by the power electronic equipment. This study investigates harmonic distortion issues in a wastewater treatment plant to verify compliance with IEEE standard 519 using simulation software ETAP and realistic data from the plant. Harmonic quantification shows that the plant harmonic situation violates IEEE Standard 519 where harmonic levels exceed its voltage and current limits. Differe

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6

Chen, Yimo, Fanrui Kong, Kai Zeng, et al. "A Trimming Strategy for Mass Defects in Hemispherical Resonators Based on Multi-Harmonic Analysis." Micromachines 16, no. 4 (2025): 480. https://doi.org/10.3390/mi16040480.

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This study investigates the impact of etching trimming parameters on the multiple harmonics of the mass distribution in hemispherical resonators and proposes a novel 1st harmonic trimming scheme. As mass balancing technology advances, the extension of identification and trimming from frequency split to multiple harmonics remains a challenge. Initially, a multi-harmonic identification scheme based on spurious mode detection was established, considering the influence of the first three harmonics of the mass distribution on the dynamic characteristics of hemispherical resonators. Finite element m

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7

Karomah, Akhlaqul. "Induction Motor Harmonics Voltage Waveform Analysis based on Machine Constriction." Jurnal EECCIS (Electrics, Electronics, Communications, Controls, Informatics, Systems) 14, no. 2 (2020): 63–67. http://dx.doi.org/10.21776/jeeccis.v14i2.639.

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Abstractâ€” This paper discussed about harmonic analysis in an induction motor. Harmonics on induction motor appear due to the machine construction specially to its slots. The analysis of those harmonic will be one of the problems in the machine observation and design. In this paper a simulated computation of the flux magnet and emf induction voltage containing harmonic is proposed and discussed. FEMM simulation software is used and the result is compared to the mathematical analysis. The result shows that the emf induction harmonics wave derived from mathematic modelling and FEMM conform each

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8

Bellan, Diego. "Three-Phase Distortion Analysis based on Space-Vector Locus Diagrams." WSEAS TRANSACTIONS ON POWER SYSTEMS 18 (December 31, 2023): 467–73. http://dx.doi.org/10.37394/232016.2023.18.46.

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This work deals with the use of the space vector concept to characterize the harmonic content of a three-phase voltage/current. It is shown that the shape of the trajectory of the space vector on the complex plane (i.e., the locus diagram) provides information about its harmonic content. In particular, it is shown that each harmonic contributes to the locus diagram with a number of lobes depending on the relative angular frequency between the harmonic and the fundamental component. To this aim, the different contributions of positive-sequence and negative-sequence harmonics is explained and pu

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9

Wang, Xiangrong, and Guangtian Shi. "Analysis of harmonic influence of improved PFC circuit on SS4G electric locomotive." Journal of Physics: Conference Series 2260, no. 1 (2022): 012032. http://dx.doi.org/10.1088/1742-6596/2260/1/012032.

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Анотація:

Abstract Compared with active filter, PFC circuit has simple structure and convenient operation. Introducing it into SS4G electric locomotive can greatly reduce system harmonics. Therefore, firstly, the corresponding PFC circuit is built, and the suppression measures of peak section and discontinuous section are proposed. By improving the discontinuous section, the waveform conduction angle is expanded from 129.564° to 162.882°. Accordingly, the current harmonic at the input side is reduced from 27.38% to 16.19%. After the voltage multiplier is further introduced, the harmonic is reduced to 15

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10

Jiang, Peiyu, Zhanlong Zhang, Zijian Dong, and Yu Yang. "Vibration Measurement and Numerical Modeling Analysis of Transformer Windings and Iron Cores Based on Voltage and Current Harmonics." Machines 10, no. 9 (2022): 786. http://dx.doi.org/10.3390/machines10090786.

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The operating condition and structural state of the converter transformer are closely related to vibration. Abundant harmonics aggravate the vibration of windings and iron cores, resulting in frequent mechanical structural failures, which seriously affect the stable operation of the power system. Traditional research mainly focuses on the vibration of AC transformers without harmonics and there is no in-depth discussion of the vibration mechanism and the numerical calculation model of windings and iron cores under harmonics. In addition, the influence of harmonics, winding connection method an

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11

Ji, Yanpeng, Bin Li, and Jingcheng Sun. "Harmonic Analysis on Torque Ripple of Brushless DC Motor Based on Advanced Commutation Control." Journal of Control Science and Engineering 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/3530127.

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This paper investigates the relationship between current, back electromotive force (back-EMF), and torque for permanent-magnet brushless DC (PM BLDC) motors under advanced commutation control from the perspective of harmonics. Considering that the phase current is the influencing factor of both torque and torque ripple, this paper firstly analyzes the effects of advanced commutation on phase current and current harmonics. And then, based on the harmonics of the phase current and back-EMF, the torque harmonic expressions are deduced. The expressions reveal the relationship of harmonic order bet

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12

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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Анотація:

<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 harmo

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13

Damjanović, Ivana, Frano Tomašević, Ivica Pavić, Božidar Filipović-Grčić, and Alan Župan. "Harmonic Performance Analysis of Static Var Compensator Connected to the Power Transmission Network." Journal of Energy - Energija 67, no. 2 (2022): 13–22. http://dx.doi.org/10.37798/201867276.

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The static var compensator (SVC) is a device which is designed to compensate reactive power, increase voltage stability and to reduce voltage fluctuations. Thyristor controlled reactors (TCRs) are composed of reactors in series with bidirectional pair of thyristors. Current through reactors can be continuously controlled by changing the firing angle of thyristor valves, thus the inductive power can be easily controlled. Typical applications of TCRs in AC systems are voltage stabilization and temporary overvoltage reduction, stability improvement, damping of power oscillations and load ba

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14

Wang, Xin Tong, Xiao Bo Wang, and Hui Zhong Zhang. "Waveform Measurement and Analysis of Common Household Appliances." Applied Mechanics and Materials 599-601 (August 2014): 767–75. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.767.

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Electricity power companies have the obligation to provide qualified electrical energy to the power user, the same as electricity customers, the power company claims to provide qualified energy, electricity customers are obliged to choose the right appliances to minimize the impact on the power quality of the power system . Higher harmonics is an important indicator of the impact of power quality, household appliances majority of non-linear loads, the use of the process will produce high harmonics, although the power is not, but a huge number, pooled together, will still PQ great impact. There

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15

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 reconf

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16

Yun, Yu Xin, Min Liu, and Hai Yan Yuan. "Harmonic Analysis of Yindong ±660kV HVDC Transmission System." Applied Mechanics and Materials 448-453 (October 2013): 2049–53. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2049.

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Анотація:

Based on PSCAD/EMTDC simulation platform, this paper analyses the harmonics caused by the process of rectifier and inverter and DC bias of transformer in Yindong ±660kV HVDC transmission system. The results indicate that, characteristic harmonics of 660kV HVDC system AC bus give priority to 12k±1 time harmonics and bring serious influence to the AC system of the rectifier and converter station; the characteristic harmonics of DC lines are mainly about 12k time and the voltage ripple factor is in the specified scope; both the odd and even harmonic components are increasing significantly under D

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17

Zhao, Yong, Zi Long Yang, Du Feng Cao, Yi Bo Wang, and Hong Hua Xu. "Analysis of PCC Point Harmonics Caused by Nonlinearities of Grid-Tied PV Inverters." Advanced Materials Research 1070-1072 (December 2014): 1246–52. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1246.

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Renewable energy are usually connected to the power grid through an inverter. As the penetration level of such inverter-based distribution generation resources increases, PCC point harmonics become an important concern for grid stability and power quality. In this paper, the PCC-point harmonics in a parallel-inverter-based photovoltaic station were measured and some significant characteristics of such harmonics were presented. These harmonics are stationary; the voltage and current waveforms are lower frequency, power correlation and inter-harmonic. And these harmonics are 3-phase symmetric an

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18

Cheng, Gui Lin, and Jian Lin. "An Approach for Electrical Inter-Harmonic Analysis Based on W-H Transform." Advanced Materials Research 383-390 (November 2011): 2649–53. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2649.

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With the non-linear load being used in great quantities, a large number of harmonics and inter-harmonics exist in electrical system. However, lacking of local information, traditional Fourier transform is not suitable for inter-harmonic analysis. In the method of time-frequency analysis, WVD is a joint distribution of energy time-frequency which provides a method for inter-harmonic analysis, but the influence of the cross terms limits application. W-H transform can effectively reduce the impact of cross terms and then extract effective information of inter-harmonic.

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19

Mekhamer, S. F., A. Y. Abdelaziz, and S. M. Ismael. "Design Practices in Harmonic Analysis Studies Applied to Industrial Electrical Power Systems." Engineering, Technology & Applied Science Research 3, no. 4 (2013): 467–72. http://dx.doi.org/10.48084/etasr.309.

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Анотація:

Power system harmonics may cause several problems, such as malfunctions of electrical equipment, premature equipment failures and plant shutdowns. Accordingly, mitigation of these harmonics is considered an important target especially for industrial applications where any short downtime period may lead to great economic losses. Harmonic analysis studies are necessary to analyze the current and voltage harmonic levels and check if these levels comply with the contractual or international standard limits. If the studies reveal that the preset limits are exceeded, then a suitable harmonic mitigat

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20

KULSHRESTHA, MANJUSHA, and A. M. SHEKH. "Estimation of soil temperature by Harmonic analysis." MAUSAM 52, no. 2 (2021): 379–84. http://dx.doi.org/10.54302/mausam.v52i2.1705.

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Soil temperatures recorded at 5.10 and 20 cm depth at Anand station of Gujarat state for the period of 1982-93 were analyzed by harmonic analysis and tested it for the year 1998. The amplitude of the soil temperature wave for the various depths decreases from a maximum of 5.76° C in the first harmonic to 0.96°C in the third harmonic. First, second and third harmonic explained 55 to 76 percent, 18 to 37 percent and 2 to 4 percent of the total variance, respectively. Total percentage of total variance covered by the three harmonics at different depths are in the range of 95 to 97 percentage for

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21

Li, Xiang Zhen, Guang Ming Hu, Peng Xin Hou, Yu Bo Fan, and Chun Lin Guo. "Analysis on Harmonics Caused by Connecting Electric Vehicle Chargers with Power Network." Advanced Materials Research 724-725 (August 2013): 1393–97. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.1393.

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As a class of nonlinear loads in the power system, electric vehicle chargers will produce a certain harmonic pollution for the grid. Before the construction of charging stations, it is necessary for electric vehicle charger (station) connected to the grid to simulate and predict harmonics. The models of single charger and charge station are built separately in order to simulate and analysis the impact of a single and multiple chargers on power quality. The factors of the harmonic current ratio (HRI) and the current total harmonic distortion (THDI) varied with the charging power and the number

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22

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 curr

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23

Belchior, Fernando Nunes, Paulo Fernando Ribeiro, and Frederico Marques Carvalho. "Comparative Analysis of Instruments Measuring Time Varying Harmonics." International Journal of Emerging Electric Power Systems 17, no. 4 (2016): 463–69. http://dx.doi.org/10.1515/ijeeps-2015-0175.

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Abstract This paper aims to evaluate the performance of commercial class A and class S power quality (PQ) instruments when measuring time-varying harmonics. By using a high precision programmable voltage and current source, two meters from different manufacturers are analyzed and compared. Three-phase voltage signals are applied to PQ instruments, considering 3 situations of time-varying harmonic distortions, whose harmonic distortion values are in accordance with typical values found in power systems. This work is relevant considering that international standardization documents do not pay mu

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24

Liang, Chen, Mei Yang, Wei Zheng, and Yong Zhi. "Simulation Analysis on Harmonics Pollution of Large-Scale Wind System Accessed to Grid." Advanced Materials Research 997 (August 2014): 795–99. http://dx.doi.org/10.4028/www.scientific.net/amr.997.795.

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The harmonic sources model of wind grid accessed to power system is established by measurement and statistical methods based on the large scale wind system planning of Gansu jiuquan area. The harmonic power flow is analysed under different operation modes in power system. The harmonic pollution trend of the million kilowatt wind accessed to power system at present stage and 2015 are analysed and compared, the calculation results show that the harmonics pollution is most serious at the point which wind power accessed to the network, the harmonic pollution degree is damping along the line. The f

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25

VIMALADEVI, S., A. S. DONA MOL, V. DURGALAKSHMI, and K. SUBHASHINI. "A REVIEW OF HARMONIC ANALYSIS AND MITIGATION TECHNIQUES USING FILTERS." YMER Digital 21, no. 05 (2022): 742–52. http://dx.doi.org/10.37896/ymer21.05/85.

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Nonlinear loads draw non sinusoidal current and voltage from the utility.These nonsinusoidal current and voltages created due to nonlinear loads are called harmonics.The harmonic voltages and current disturbs the system back and creates big power quality problem.Therefore in order to mitigate harmonic problems different mechanisms are used.Here as introduction different power quality problems, harmonics and their mitigation techniques/filters are presented and discussed.Between the different ways to minimize/eliminate harmonics active power filters are most prominent one.

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26

Lee, Taeyoung. "Real Harmonic Analysis on the Special Orthogonal Group." International Journal of Analysis and Applications 20 (April 4, 2022): 21. http://dx.doi.org/10.28924/2291-8639-20-2022-21.

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This paper presents theoretical analysis and software implementation for real harmonics analysis on the special orthogonal group. Noncommutative harmonic analysis for complex-valued functions on the special orthogonal group has been studied extensively. However, it is customary to treat real harmonic analysis as a special case of complex harmonic analysis, and there have been limited results developed specifically for real-valued functions. Here, we develop a set of explicit formulas for real-valued irreducible unitary representations on the special orthogonal group, and provide several operat

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27

Luo, Dan, Yi Xiao, and Jie Na Zhou. "Harmonic Analysis of Non-Sinusoidal Harmonic Signals in Electric Power System." Advanced Materials Research 1070-1072 (December 2014): 779–84. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.779.

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Harmonic Analysis and control is very important for the power system because harmonics have serious harm to its normal operation. Harmonic Analysis uses fast Fourier transform (FFT) to solve this problem though it causes the spectrum leakage which Increases the calculation error. To solve this problem, the interpolation algorithm combine with tapered time windows are used. The tapered time windows solve the long-range leakage and the interpolation algorithm solves the problem of short-range leakage.

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28

Zhang, Min, Jinhao Wang, Shifeng Zhang, et al. "Harmonic Resonance Analysis and Impedance Remodeling Method of Multi-Inverter Grid-Connected System." Electronics 12, no. 17 (2023): 3684. http://dx.doi.org/10.3390/electronics12173684.

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The harmonic and resonant characteristics of a multi-inverter grid-connected system can negatively affect power quality when weak grid conditions are present. In this paper, firstly, harmonic currents are modeled for the inverter, the correctness of low-frequency harmonics and high-frequency harmonics are verified in closed loop, and the characteristics of harmonic currents are analyzed when the parameters are varied. Secondly, the resonant characteristics of the inverter with feed-forward link are analyzed, and a multi-inverter grid-connected equivalent model based on the triple-decomposition

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29

Schubert, Dominik, Simon Hecker, Stefan Sentpali, and Martin Buss. "Feasibility Analysis for Active Noise Cancellation Using the Electrical Power Steering Motor." Acoustics 6, no. 3 (2024): 730–53. http://dx.doi.org/10.3390/acoustics6030040.

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This paper describes the use of an electric drive as an acoustic actuator for active noise cancellation (ANC). In the presented application, the idea is to improve the noise, vibration, harshness (NVH) characteristics of passenger cars without using additional active or passive damper systems. Many of the already existing electric drives in cars are equipped with the required hardware components to generate noise and vibration, which can be used as compensation signals in an ANC application. To demonstrate the applicability of the idea, the electrical power steering (EPS) motor is stimulated w

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30

Ma, Chenghu, Hui Han, and Xing Yan. "Error Analysis of Electric Energy Metering System Considering Harmonics." Journal of Physics: Conference Series 2310, no. 1 (2022): 012086. http://dx.doi.org/10.1088/1742-6596/2310/1/012086.

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Abstract The watt hour metering system includes watt hour meter, voltage and current transformer, errors of them will affect the overall error of metering system. Considering harmonic, this paper studies the measurement accuracy of metering system, the harmonic equivalent circuits of energy meter, voltage and current transformer are established, their harmonic measurement errors and influencing factors are analyzed, the model of whole metering system is bulit and its measurement errors are anylyzed. Through the simulation of a specific watt hour metering system, the influence of harmonics on i

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31

Hu, HeJun, JunJia Wang, YiYun Huang, XiaoFeng Li, and Hui Chen. "Analysis and Suppression of Harmonic Characteristic for Multi-pulse Rectifier Based on Phase-shifting Transformer." Journal of Physics: Conference Series 2237, no. 1 (2022): 012003. http://dx.doi.org/10.1088/1742-6596/2237/1/012003.

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Abstract With the wide application of rectifiers, the harmonic content of power grid is increasing. In fact, the multi-pulse rectifier produces lower harmonic content than the lower pulse rectifier. In order to reduce harmonic content from harmonic source in power grid, the multi-pulse rectifier is designed based on the phase-shifting transformer in this paper. First of all, the design method of multi-pulse rectifier is introduced by theoretical analysis. Then, the harmonic mechanism is deduced by the mathematical formula, which explains the harmonic generation process. After that, the correct

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32

Fetene, Zewdu Alamineh, Tesfay Mekonnen Weldegerima, Tadesse Terefe Zeleke, and Melessew Nigussie. "Harmonic Analysis of Precipitation Time Series in Lake Tana Basin, Ethiopia." Advances in Meteorology 2018 (June 7, 2018): 1–9. http://dx.doi.org/10.1155/2018/1598195.

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This study presents harmonic analysis of precipitation observations within the Lake Tana Basin for the periods of 1985–2015. The livelihood of several millions of people within the basin and outside the basin is governed by the precipitation conditions within this basin. Large spatial and temporal variabilities of precipitation can increase the incidence of extreme events such as floods and droughts. It is important to identify the characteristics of these variations, and this study aims at investigating the characteristics of the seasonal and annual cycles of precipitation within the Lake Tan

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33

Liu, Rong Hui, Ai Qang Pan, and Xiu Yang. "Analysis for Power System Transient Harmonics Based on Wavelet Packet Transform." Applied Mechanics and Materials 415 (September 2013): 241–44. http://dx.doi.org/10.4028/www.scientific.net/amm.415.241.

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In this paper, the principles of wavelet transform and wavelet packet transform were presented. The wavelet packet transform had good characteristics of uniform frequency decomposition, and thus transient harmonic analysis method was proposed based on wavelet packet transform. Finally, transient interharmonic, time varying harmonic and transient oscillation signals in power systems were simulated with Matlab emulator. The perfect results of simulation show that the presented method can accurately detect the transient harmonics, which provides support for harmonic analysis in power systems.

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34

Zhao, Jinshuai, Honggeng Yang, Xiaoyang Ma, and Fangwei Xu. "Evaluation of Harmonic Contributions for Multi Harmonic Sources System Based on Mixed Entropy Screening and an Improved Independent Component Analysis Method." Entropy 22, no. 3 (2020): 323. http://dx.doi.org/10.3390/e22030323.

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Evaluating the harmonic contributions of each nonlinear customer is important for harmonic mitigation in a power system with diverse and complex harmonic sources. The existing evaluation methods have two shortcomings: (1) the calculation accuracy is easily affected by background harmonics fluctuation; and (2) they rely on Global Positioning System (GPS) measurements, which is not economic when widely applied. In this paper, based on the properties of asynchronous measurements, we propose a model for evaluating harmonic contributions without GPS technology. In addition, based on the Gaussianity

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35

Zheng, Wei Jie. "Admittance Elements Comparatively Amplitude Trend Analysis of Thyristor Controlled Reactor." Advanced Materials Research 918 (April 2014): 160–64. http://dx.doi.org/10.4028/www.scientific.net/amr.918.160.

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Thyristor controlled reactor was important reactive compensator which is widely used in power system, while it also a harmonic source which is necessary to be researched, especially the harmonic characteristics and harmonic amplitude changing trend, which is important to model, simulate and improve the equipment design. The paper analysed the admittance elements comparatively amplitude trend of thyristor controlled reactor.The research result will help to compensate or reduce the harmonics generated by thyristor controlled reactor, which also will be helpful to model and simulate other thyrist

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36

Wang, Guishuo, Xiaoli Wang, and Chen Zhao. "An Iterative Hybrid Harmonics Detection Method Based on Discrete Wavelet Transform and Bartlett–Hann Window." Applied Sciences 10, no. 11 (2020): 3922. http://dx.doi.org/10.3390/app10113922.

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The current signal harmonic detection method(s) cannot reduce the errors in the analysis and extraction of mixed harmonics in the power grid. This paper designs a harmonic detection method based on discrete Fourier transform (DFT) and discrete wavelet transform (DWT) using Bartlett–Hann window function. It improves the detection accuracy of the existing methods in the low frequency steady-state part. In addition, it also separates the steady harmonics from the attenuation harmonics of the high frequency part. Simulation results show that the proposed harmonic detection method improves the dete

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37

Gardiner, Stephen J. "Coincidence of Harmonic and Finely Harmonic Functions." Potential Analysis 34, no. 1 (2010): 81–88. http://dx.doi.org/10.1007/s11118-010-9182-0.

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38

Badugu, Jayababu, Y. P.Obulesu, and Ch Saibabu. "Harmonic Analysis of Three-phase Fixed Capacitor–thyristor Controlled Reactor under Balanced and Unbalanced Conditions." IAES International Journal of Robotics and Automation (IJRA) 7, no. 1 (2018): 67. http://dx.doi.org/10.11591/ijra.v7i1.pp67-76.

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Three-phase Fixed Capacitor Thyristor Controlled Reactor is widely used for reactive power compensation in power systems because of reduced cost and high reliability. The problem with FC-TCR is that to generate current harmonics when it is partially conducting. When this harmonic current is interacted with system impedance, voltage waveform will distorted. This harmonic pollution is undesirable in power systems. Therefore, it is important to know the harmonic behaviour of three-phase FC-TCR before they can be used in a power system network. This paper presents the harmonic analysis of three-ph

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39

Rouhollah, Mahmoud, and Amin. "Harmonic Improvement of Multilevel Inverter with Asymmetric Switching Modes and Harmonic Search Optimization Method." Tobacco Regulatory Science (TRS) 8, no. 1 (2022): 3971–89. https://doi.org/10.5281/zenodo.7581680.

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This paper deals with the harmonic analysis of multi-level converters and harmonic reduction methods. The proposed method for multilevel converter aims to provide a suitable model in an asymmetric switching mode and extract the analytical relationships for output harmonics. In the end, the harmony search optimization method is used to obtain the optimized output voltage harmonics in asymmetric switching mode. The proposed structure for the 5-level asymmetric inverter is presented using the results of the proposed model as well as the optimized harmony. Simulations are performed in Matlab

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40

Ning, D., X. Zhuo, L. Chen, and B. Teng. "Nonlinear Numerical Investigation on Higher Harmonics at Lee Side of a Submerged Bar." Abstract and Applied Analysis 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/214897.

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The decomposition of a monochromatic wave over a submerged object is investigated numerically in a flume, based on a fully nonlinear HOBEM (higher-order boundary element method) model. Bound and free higher-harmonic waves propagating downstream the structure are discriminated by means of a two-point method. The developed numerical model is verified very well by comparison with the available data. Further numerical experiments are carried out to study the relations between free higher harmonics and wave nonlinearity. It is found that thenth-harmonic wave amplitude is growing proportional to the

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41

Gong, Chen Bin, Qing Hao Wang, Gang Chen, et al. "Research on Harm of Harmonics on Electrical Equipment." Advanced Materials Research 986-987 (July 2014): 1846–49. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1846.

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Through the analysis of harmonics caused by transformer, capacitor, electromagnetic voltage transformer and other accident, harmonics is an important indicator of power quality, which has been included in the “pollution" of power grid is found. In order to understand the harmonic, this paper from the concept of quality of electric energy, and then gradually extended to the field of harmonics. This paper firstly introduces the various reasons and equipment may produce harmonic, Secondly, illustrate harm of harmonic to operation of transformers, capacitors, electromagnetic voltage transformers a

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42

Krantz, Steven G. "Harmonic analysis." Wiley Interdisciplinary Reviews: Computational Statistics 3, no. 2 (2011): 163–67. http://dx.doi.org/10.1002/wics.143.

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43

Zhou, Boyu. "Consideration of Harmonic Resonance Analysis and Harmonic Load Analysis for Harmonic Gearbox Modal Analysis." Scientific Journal of Intelligent Systems Research 7, no. 6 (2025): 56–65. https://doi.org/10.54691/wryvm592.

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As a key component of industrial robots, the study of the dynamic characteristics of harmonic gear reducers and the determination of resonance positions are of significant importance. To avoid the occurrence of resonance problems in the operation of harmonic gear reducers, this study conducted modal analysis and harmonic response analysis on the harmonic gear reducer. Particularly, considering that the flexible wheel is the part of the reducer most likely to fail, it is the key component of vibration analysis. Here, we selected the SHG-25100 harmonic gear reducer as the research object and con

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44

Nömm, Jakob, Sarah Rönnberg, and Math Bollen. "An Analysis of Voltage Quality in a Nanogrid during Islanded Operation." Energies 12, no. 4 (2019): 614. http://dx.doi.org/10.3390/en12040614.

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Voltage quality data has been collected in a single house nanogrid during 48 weeks of islanded operation and 54 weeks of grid-connected operation. The voltage quality data contains the voltage total harmonic distortion (THD), odd harmonics 3 to 11 and 15, even harmonics 4 to 8, voltage unbalance, short-term flicker severity (Pst) and long-term flicker severity (Plt) values, and voltage variations at timescales below 10 min. A comparison between islanded and grid-connected operation values was made, were some of the parameters were compared to relevant grid standard limits. It is shown that som

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45

T., D. Dongale1 D. A. Kulkarni2 M. D. Uplane 3. "HARMONICS ANALYSIS OF FOUR SWITCH THREE PHASE INVERTER." International Journal of Information Technology, Modeling and Computing (IJITMC) 1, November (2018): 01–07. https://doi.org/10.5281/zenodo.1421496.

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In the viewpoint of reliability implication and cost effectiveness of three phase inverter, there should be less device count in inverter topology and fewer losses in the semiconductor switches. The earlier reported less device count topology by many research groups are facing the problem of Total Harmonic Distortion (THD). The imperfect design value of DC link capacitor is the main reason of Harmonic Distortion (THD) problem. The ripple in the dc link voltages of Voltage Source Inverter (VSI) is leads to additional harmonics distortion. This paper present the simulative view of minimization o

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46

Wu, Xiao Yu, Zhe Ming Chen, and Ze Hao Huang. "Analysis and Calculation of Electromagnetic Torque for the Voltage Source Traction Motors." Applied Mechanics and Materials 446-447 (November 2013): 672–77. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.672.

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The traction motor installed on the high-speed train is powered by inverter. A large number of harmonics may appear when motor is operating. Then the motor speed generate oscillation and finally the dynamic characteristic is affected in vehicle system. In this paper, relied on the electromagnetism of traction motor, the mechanism about emerging harmonic torque is analyzed. In addition, based on the equivalent circuit, the method of calculating the parameters in harmonic circuit is proposed. Two mathematical formulas are also proposed to obtain the fundamental electromagnetic torque and the har

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47

Subhagsinh, Solanki *1 Prof. Mukesh Kumar Lodha 2. "ANALYSIS AND MITIGATION OF HARMONICS IN 11KV DISTRIBUTION SYSTEM." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 9 (2017): 72–74. https://doi.org/10.5281/zenodo.884867.

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Power quality is major problem in power distribution system and harmonic distortion is one of them. Harmonic distortion problem occurs due to uses of nonlinear loads like adjustable speed drives, power electronics converters, electronic ballasts etc.. Large considerations of these nonlinear loads have the potential to raise harmonic voltage and currents in a power distribution system to unacceptable high levels that can adversely affect the system. In this paper we consider 11kv distribution line and for mitigation of this harmonic distortion, shunt active power filter is widely used in a dist

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48

Zhukovsky, K. "Theoretical spectral analysis of FEL radiation from multi-harmonic undulators." Journal of Synchrotron Radiation 27, no. 6 (2020): 1648–61. http://dx.doi.org/10.1107/s1600577520012230.

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A theoretical study of the spontaneous and stimulated undulator radiation (UR) from electrons in undulators with multiple periods in both transversal directions is presented. Exact expressions are derived for the UR intensities in terms of the generalized Bessel and Airy functions, accounting for undulator field harmonics of arbitrary strength and for real parameters of the beams and installations. Theoretical results are verified with numerical and experimental data for SWISS-XFEL, PAL-XFEL, LEUTL, LCLS etc. The spectrum, UR line shape and width, and the harmonic evolution along the undulator

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49

Gorbatenko, V. V., B. N. Prasolov, S. A. Gorbatenko, and N. V. Datsenko. "Harmonic Analysis of the Polarization Reversal of the Rb2ZnCl4 Crystal in the Incommensurate Phase." Кристаллография 68, no. 5 (2023): 734–37. http://dx.doi.org/10.31857/s0023476123600453.

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The polarization reversal of Rb2ZnCl4 crystals in the incommensurate phase near a ferroelectric phase transition (PT) under the action of harmonic electric field has been studied using harmonic analysis. During polarization reversal of a test sample under the action of harmonic electric field, a PT induced by the electric field from the incommensurate phase to the ferroelectric phase and a PT from the field-induced ferroelectric phase back to the incommensurate phase occur. The study of the active and reactive contributions to the amplitudes of current density harmonics made it possible to det

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50

Xu, Shao, and Chen. "Data-Driven Compartmental Modeling Method for Harmonic Analysis—A Study of the Electric Arc Furnace." Energies 12, no. 22 (2019): 4378. http://dx.doi.org/10.3390/en12224378.

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The electric arc furnace (EAF) contributes to almost one-third of the global iron and steel industry, and its harmonic pollution has drawn attention. An accurate EAF harmonic model is essential to evaluate the harmonic pollution of EAF. In this paper, a data-driven compartmental modeling method (DCMM) is proposed for the multi-mode EAF harmonic model. The proposed DCMM considers the coupling relationship among different frequencies of harmonics to enhance the modeling accuracy, meanwhile, the dimensions of the harmonic dataset are reduced to improve computational efficiency. Furthermore, the p

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