• Title/Summary/Keyword: Direct compensating voltage extraction method.

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Three-phase Four-wire Series Active Power Filter Control Strategy for The Compensation of Harmonics and Reactive Power Based-on Direct Compensating Voltage Extraction Method (직접 보상전압 추출기법을 이용하여 고조파전류와 무효전력을 보상하는 3상 4선식 직렬 형 능동전력필터의 제어법)

  • 김진선;김영석
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.3
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    • pp.213-221
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    • 2004
  • In recent years, since more and more diode rectifiers with smoothing dc capacitor are used in electronic equipments, household appliances and ac drives, harmonics generated by these loads have become a major issue. In addition, 3-phase 4-wire system is widely employed in distributing electric energy to several office building and manufacturing plants. This systems show excessive currents in the neutral. These neutral currents are fundamentally third harmonic, and their presence is tied to wiring failure, elevating of neutral potentials, transformer overheating, etc. In response to the concerns, this paper proposes a series active power filter scheme based on direct compensating voltage extraction method and the advantage of this control algorithm is direct extraction of compensation voltage reference without multiplying gain. Therefore, the calculation of the compensation voltage reference will becom much simpler than other control algorithm. To verify the effectiveness of the proposed algorithm, a prototype active power filter is built and some experiments are carried out.

A Novel Series Active Power Filter Using Direct Compensating Voltage Extraction Method (직접 보상전압 추출기법을 이용한 새로운 직렬형 능동전력필터)

  • 우원명;한윤석;김영석;원충연;최세완
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.3
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    • pp.258-264
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    • 2001
  • In this paper, a new control strategy of a series active power filter suing direct compensating voltage extraction method is proposed. The proposed series active power filter and shunt passive filters are used 3-phase 3-wire power system with nonlinear load. The series active power filter complements drawbacks of the shunt passive filter and contributes to a source side harmonic reduction. We can extract the compensating voltage of the series active power filter using performance function without phase transformations. Therefore, the calculating time is short and the control method is simple compared with conventional methods. Experimental results verify that the system using the proposed method appears a good performance.

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The Harmonics and Reactive Power Compensation with Series Active Power filter in 3-phase 4-wire System (3상 4선식 전력시스템에서 직렬형 능동필터에 의한 고조파전류와 무효전력 보상에 관한 연구)

  • Kim, Jin-Sun;Kim, Young-Jo;Kim, Young-Seok
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.1072-1074
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    • 2003
  • In this paper, a new control strategy of a series active power filter using direct compensating voltage extraction method is proposed. This control algorithm compensates harmonics, reactive power and neutral line currents which are generated by balanced or unbalanced nonlinear loads. The advantage of this method is that the compensating voltage of the series active power filter can be extracted without phase transformation. Therefore, calculation time is shorten and the control method is simple compared with conventional method as the p-q theory In addition, this control strategy was applied for the series active power filter in 3-phase 4-wire system which is widely employed in distributing electric energy to several office building and manufacturing plants. Some results obtained from the experimental model using the proposed method are presented to demonstrate and confirm its validity.

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Series Active Power Filters to Compensate Harmonics and Reactive Power with the Direct Compensating Voltage Extraction Method in Three-Phase Four-Wire Systems

  • Kim, Jin-Sun;Kim, Young-Seok
    • Journal of Power Electronics
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    • v.9 no.5
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    • pp.691-699
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    • 2009
  • This paper presents the analysis of series active power filter for reactive power compensation, load balancing, harmonic elimination, and neutral current eradication in three-phase four-wire power systems. Generally, the three-phase four-wire system is widely employed in distributing electric energy to several office building and manufacturing plants. In such systems, the third harmonic and its 3rd harmonics are termed as triple and zero sequence components that do not cancel each other in the system neutral. Consequently, the triple harmonics add together creating a primary source of excessive neutral current. Regarding this concern, this paper presents a new control algorithm for a series hybrid active system, whereas the control approach it adopts directly influence its compensation characteristics. Hence, the advantage of this control algorithm is the direct extraction of compensation voltage reference without phase transformations and multiplying harmonic current value by gain and the required rating of the series active filter is much smaller than that of a conventional shunt active power filter. In order to show the effectiveness of the proposed control algorithm, experiments have been carried out.