• Title/Summary/Keyword: harmonic current compensation

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Comparison of Flywheel Systems for Harmonic Compensation Based on Wound/Squirrel-Cage Rotor Type Induction Motors

  • Kim, Yoon-Ho;Jeong, Yeon-Suk;Jeong, Yeon-Suk
    • Journal of Power Electronics
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    • v.1 no.2
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    • pp.127-132
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    • 2001
  • This paper describes two different systems which can compensate harmonic currents generated in a power system. As non-linear loads increase gradually in industry fields, harmonic current generated in the electric power network system also increases. Harmonic current makes a power network current distorted and generates heat, vibration and noise in the power machinery. Many approaches have been applied to compensate harmonic currents generated in the power system. Among various approaches, in this paper, two kinds are compared and evaluated. They are flywheel compensators bases on secondary excitation of WRIM(wounded rotor induction motor) and SCIM(squirrel cage induction motor). Both systems have a common structure. They use a flywheel as an energy storage device and use PWM inverters. The main differences are the size and rating of the converter used.

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Comparison of Harmonic Compensation Based on Wound/Squirrel-Cage Rotor Type Induction Motors With Flywheel (플라이휠을 장착한 농형/권선형 전동기를 이용한 두 고조파 보상 시스템의 비교)

  • 김윤호;이경훈;양성혁;박경수
    • Journal of the Korean Society for Railway
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    • v.4 no.1
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    • pp.16-22
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    • 2001
  • This paper describes two different systems which can compensate harmonic currents generated in the power system. As non-linear loads increase gradually in industry fields, harmonic current generated in the electric power network system also increases. Harmonic current makes a power network current distorted and generates heat, vibration, noise in the power machinery. Many approaches have been applied to compensate harmonic currents generated in the power network system. Among various approaches, in this paper, two kinds of approaches are compared and evaluated. They are flywheel compensator based on secondary excitation of wounded rotor induction motor(WRIM) and primary excitation of squirrel cage induction motor(SCIM). Both systems have a common structure. They use a flywheel as a energy storage device and use PWM inverters.

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Harmonic and Power Factor Compensation Using WRIM Based on Sliding Mode Controller (슬라이딩 모드제어기와 권선형 유도전동기를 이용한 고조파 및 역률보상)

  • Kim Seung-Mo;Kim Yoon-Ho
    • Proceedings of the KIPE Conference
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    • 2002.11a
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    • pp.7-11
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    • 2002
  • This paper proposes an APF(Active Power Filter) with WRIM(Wounded Rotor Induction Motor) controlled by sliding mode which can compensate harmonic currents generated in a power system. As non-linear loads increase gradually in industry fields, harmonic current generated In the electric power network system also increases. Harmonic current makes a power network current distorted and generates heat, vibration and noise In the power machinery, Many approaches have been applied to compensate harmonic currents generated in the power system. Among various control strategy, in this paper, a sliding mode controlled systems is designed and evaluated. This is a flywheel compensator based on secondary excitation of WRIM(wounded rotor induction motor) with SMC(sliding mode controller). The proposed system uses a flywheel as an energy storage device. The designed control scheme is verified through simulation.

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Harmonic Mitigation and Power Factor Improvement using Fuzzy Logic and Neural Network Controlled Active Power Filter

  • Kumar, V.Suresh;Kavitha, D.;Kalaiselvi, K.;Kannan, P. S.
    • Journal of Electrical Engineering and Technology
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    • v.3 no.4
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    • pp.520-527
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    • 2008
  • This work focuses on the evaluation of active power filter which is controlled by fuzzy logic and neural network based controller for harmonic mitigation and power factor enhancement. The APF consists of a variable DC voltage source and a DC/AC inverter. The task of an APF is to make the line current waveform as close as possible to a sinusoid in phase with the line voltage by injecting the compensation current. The compensation current is estimated using adaptive neural network. Using the estimated current, the proposed APF is controlled using neural network and fuzzy logic. Computer simulations of the proposed APF are performed using MATLAB. The results show that the proposed techniques for the evaluation of APF can reduce the total harmonic distortion less than 3% and improve the power factor of the system to almost unity.

Direct Harmonic Voltage Control Strategy of Shunt Active Power Filters Suitable for Microgrid Applications

  • Munir, Hafiz Mudassir;Zou, Jianxiao;Xie, Chuan;Li, Kay;Younas, Talha;Guerrero, Josep M.
    • Journal of Power Electronics
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    • v.19 no.1
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    • pp.265-277
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    • 2019
  • The application of shunt active power filters (S-APFs) is considered to be the most popular approach for harmonic compensation due to its high simplicity, ease of installation and efficient control. Its functionality mainly depends upon the rapidness and precision of its internally built control algorithms. A S-APF is generally operated in the current controlled mode (CCM) with the detection of harmonic load current. Its operation may not be appropriate for the distributed power generation system (DPGS) due to the wide dispersion of nonlinear loads. Despite the fact that the voltage detection based resistive-APF (R-APF) appears to be more appropriate for use in the DPGS, the R-APF experiences poor performance in terms of mitigating harmonics and parameter tuning. Therefore, this paper introduces a direct harmonic voltage detection based control approach for the S-APF that does not need a remote harmonic load current since it only requires a local point of common coupling (PCC) voltage for the detection of harmonics. The complete design procedure of the proposed control approach is presented. In addition, experimental results are given in detail to validate the performance and superiority of the proposed method over the conventional R-APF control. Thus, the outcomes of this study approve the predominance of the discussed strategy.

A Series Active Power Filter For Harmonic Currents And Reactive Power Compensation (고조파 전류와 무효전력보상을 위한 직렬형 능동전력필터)

  • 김진선;고수현;김영석
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.5
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    • pp.221-229
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    • 2003
  • This paper suggests a control algorithm of 3-phase 3-wire series active power filter. This suggested algorithm can compensate source harmonics and reactive power in 3-phase 3-wire power distribution systems. These harmonics are generated by nonlinear loads such as diode rectifiers and thyristor converters. This control algorithm extracts a compensation voltage reference from performance function without phase transformation. Therefore, this control algorithm is simpler than any other conventional control algorithms. 3-phase 3-wire series active power filters which have a harmonic voltage source and a harmonic current source are manufactured and experiments are carried out to verify the effectiveness of suggested control algorithm.

Intervening Firing Method and Passive Filter Design for Harmonic Elimination and Reactive Power Compensation in Three-Phase Thyristor Phase-Controlled Converters Supplying a DC Motor

  • Pattanapongchai, Artite;Wongtongdee, Surached W.;Laohasongkram, Piphat
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.813-816
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    • 2005
  • This paper presents a method for harmonic elimination and reactive power compensation using an intervening firing method and passive power filter with is suitable to compensate rapidly changing loads and reactive power. The proliferation of three-phase thyristor phase-controlled converter of DC motor drives into a power system has the potential to increase the harmonic levels in the power system. The design procedure of an intervening firing method and passive power filter capable of reducing the voltage and current harmonics produced by converter supplied from a source having internal large inductive impedance is offered. The analysis uses the or CAD PSpice to model three-phase thyristor phase-controlled converter of DC motor drives as well as the system.

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A New Control Algorithm of Series Active Power Filter for Harmonic Reduction in Power System (전력계통 시스템에서 고조파 저감을 위한 새로운 직렬형 능동전력필터의 제어법)

  • Lim, Seung-Won;Han, Yoon-Seok;Kim, Young-Seok;Won, Chung-Yuen;Choi, Se-Wan
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.5
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    • pp.221-228
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    • 2001
  • In this paper, a new control algorithm of series active power filter is proposed to reduce harmonic generated from nonlinear load in power system. In conventional control algorithm, harmonic current must be calculated firstly, and then compensation voltage was calculated by using the results but the proposed control algorithm can calculate compensation voltage directly. Compensating principle of proposed control algorithm is presented in detail. A combined system of series active filter and passive filter is composed in order to experiment. Experiment was carried out to verify proposed control algorithm of series active filter and experimental results are analyzed.

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A SIMPLE REACTIVE/HARMONIC COMPENSATION METHOD WITH VOLTAGE TYPE CONVERTER (전압형 컨버터를 이용한 무효/고조파 보상을 위한 선형 제어 방법)

  • Kim, Hyo-Jin;Jeong, Seung-Gi;Choi, Jae-Ho;Park, Min-Ho
    • Proceedings of the KIEE Conference
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    • 1989.11a
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    • pp.305-309
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    • 1989
  • This paper presents a simple method to compensate reactive/harmonic current components in power lines, with voltage type current controlled converter. The method proposed differs from conventional methods in that it does not rely on explict evaluation of active power. Instead, the closed-loop control of the do link voltage of the compensator plays a major role in adjusting the compensation current. It is shown that the system can be modelled as a simple linear system, which facilitates th analytical approach to the system characteristics. The dynamic performances are examined through the digital simulation and some aspects on the controller design are discussed. Experimental results showed good agreement with the anticipate performance

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Single-Phase Hybrid Active Power Filter Using Rotating Reference Frame (회전좌표계를 이용한 단상 하이브리드형 능동 전력필터)

  • Kim Jin-Sun;Kim Young-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.8
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    • pp.377-386
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    • 2005
  • This paper presents the control algorithm of single-phase hybrid active power filter for the compensation of harmonic current components in nonlinear R-L load with passive active Power filters. To construct two phase system, an imaginary second phase was made. In this proposed method, the new signal which is the delayed through the filtering by the phase-delay property of low-pass filter is used as the secondary phase. Because two-phases have the different phase, the instantaneous calculation of harmonic current is possible. In this paper, a reference voltage is created by multiplying the coefficient k by the compensation current using the rotating reference frame synchronized with the source-frequency, not applying to instantaneous reactive power theory which has been used with the existing fixed reference frames In order to verify the validities of the proposed control methods, experiments are carried out with the prototypes of single-phase hybrid active power filter.