• Title/Summary/Keyword: Voltage sag compensator

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Development of Three Phase 10kW Voltage Sag Compensator (SEMI F47을 만족하는 10kW급 3상 전압 새그 보상기 개발)

  • Chae, Seung-Woo;Cho, Hyun-Sik;Lee, Il-Yong;Kong, Se-Il;Han, Byung-Moon;Cha, Han-Ju
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.3
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    • pp.198-204
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    • 2012
  • 3-Phase voltage sag compensator protects a critical load from grid sags. The paper presents an algorithm and design of 3-phase voltage compensator. Compensator algorithm consists of a 3-phase voltage sag detection, thyrister commutation method and inverter output voltage control. The compensator satisfies SEMI F47 standard and 10kW 3-phase voltage sag compensator prototype is assembled. Validity of the proposed compensator is verified by simulation and experiment.

Stand-Alone Type Single-Phase Fuel Cells Micro-Source with ac Voltage Compensation Capability (교류전압 보상 기능을 갖는 독립형 단상 연료전지 마이크로 소스)

  • Jung, Young-Gook
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.1
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    • pp.35-41
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    • 2009
  • This paper proposes a stand alone type single-phase fuel cells micro-source with a voltage sag compensator for compensating the ac output voltage variations (sag or swell) of micro-source. The proposed micro-source is consist of a PEM(polymer electrolyte membrane) fuel cells simulator, a full bridge de converter, a 60Hz PWM(pulse width modulation) VSI(voltage source inverter), and a voltage sag compensator. Voltage sag compensator is similar to the configuration of hybrid series active power filter, and it is directly connected to micro-source through the injection transformer. Compensation algorithm of a voltage sag compensator adopts a single phase p-q theory. Effectiveness of the proposed the system is verified by the PSIM(power electronics simulation tool) simulation in the steady state and transient state which the proposed system is able to simultaneously compensate the harmonic current and source voltage sag or swell.

Three-Phase PWM-Switched Autotransformer Voltage-Sag Compensator Based on Phase Angle Analysis

  • Mansor, Muhamad;Rahim, Nasrudin Abd.
    • Journal of Power Electronics
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    • v.11 no.6
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    • pp.897-903
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    • 2011
  • Many voltage sag compensators have been introduced, including the traditional dynamic voltage restorer (DVR), which requires an energy storage device but is inadequate for compensating deep and long-duration voltage sags. The AC-AC sag compensators introduced next do not require a storage device and they are capable of compensating voltage sags. This type of compensator needs an AC-AC converter to regulate the output voltage. Presented in this paper is a three-phase PWM-switched autotransformer voltage sag compensator based on an AC-AC converter that uses a proposed detection technique and PWM voltage control as a controller. Its effectiveness and capability in instantly detecting and compensating voltage sags were verified via MATLAB/Simulink simulations and further investigated through a laboratory prototype developed with a TMS320F2812 DSP as the main controller.

Single phase voltage sag compensator using single phase AC/AC chopper (단상 AC/AC 초퍼를 이용한 단상 Voltage Sag Compensator)

  • Kim, Dong-Kyu;Choi, Nam-Sup
    • Proceedings of the KIPE Conference
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    • 2014.07a
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    • pp.142-143
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    • 2014
  • 본 논문에서는 Buck type의 단상 AC/AC 초퍼를 이용한 단상 voltage sag compensator를 제안한다. 제안된 회로는 sag보상 동작 시 사용된 변압기의 누설리액턴스가 단상 PWM Buck AC/AC converter에 미치는 영향이 작아 동작효율이 높고, sag가 발생하지 않는 상태일 때 입력과 출력이 절연되는 장점이 있다. 본 논문에서는 제안된 회로의 동작 및 특성을 설명하고, 타당성을 입증하기 위해 PSIM으로 시뮬레이션 하였다.

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Three Phase Voltage Sag Compensator Using Three Phase AC/AC Chopper (3상 AC/AC 초퍼를 이용한 3상 Voltage Sag Compensator)

  • Kim, Dong-Kyu;Choi, Nam-Sup
    • Proceedings of the KIPE Conference
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    • 2014.07a
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    • pp.144-145
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    • 2014
  • 본 논문에서는 Buck type의 3상 AC/AC 초퍼를 이용한 3상 voltage sag compensator를 제안한다. 제안된 회로는 sag보상 동작 시 사용된 변압기의 누설리액턴스가 3상 PWM Buck AC/AC converter에 미치는 영향이 작아 동작효율이 높고, sag가 발생하지 않은 상태일 때 입력과 출력이 절연되는 장점이 있다. 본 논문에서는 제안된 회로의 동작 및 특성을 설명하고, 타당성을 입증하기 위해 PSIM으로 시뮬레이션 하였다.

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Implementation of Voltage Sag/Swell Compensator using Direct Power Conversion (직접전력변환 방식을 이용한 전압 강하/상승 보상기의 구현)

  • Lee, Sang-Hoey;Cha, Han-Ju;Han, Byung-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.8
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    • pp.1544-1550
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    • 2009
  • In this paper, a new single phase voltage sag/swell compensator using direct power conversion is proposed. A new compensator consists of input/output filter, series transformer and direct ac-ac converter, which is a single-phase back-to-back PWM converter without dc-link capacitors. Advantages of the proposed compensator include: simple power circuit by eliminating dc link electrolytic capacitors and thereby, improved reliability and increased life time of the entire compensator; simple PWM strategy or compensating voltage sag/swell at the same time and reduced switching losses in the ac-ac converter. Further, the proposed scheme is able to adopt simple switch commutation method without requiring complex four-step commutation method that is commonly employed in the direct power conversion. Simulation and experimental results are shown to demonstrate the advantages of the new compensator and PWM strategy. A 220V, 3kVA single-phase compensator based on the digital signal processor controller is built and tested.

Single-Phase Series Type Quasi Z-Source Voltage Sag-Swell Compensator for Voltage Compensation of Entire Region (전 영역의 전압보상을 위한 단상 직렬형 Quasi Z-소스 전압 Sag-Swell 보상기)

  • Eom, Jun-Hyun;Jung, Young-Gook;Lim, Young-Cheol
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.4
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    • pp.322-332
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    • 2013
  • Conventional single-phase series quasi Z-source voltage compensator can not compensate for voltage sag less than 50% that frequently occurs in the industrial field. In this study, single-phase series quasi Z-source voltage sag-swell compensator which can compensate the voltage variation of entire range is proposed. The proposed system is composed of two quasi Z-source AC-AC converters connected in series with output terminal stage. Voltage sag less than 50% could be compensated by the intersection switching control of the upper converter duty ratio and of the upper converter duty ratio. Also the compensation voltage and its flowchart for each compensation mode are presented for entire sag-swell region. To confirm the validity of the proposed system, a DSP(DSP28335) controlled experimental system was manufactured. As a result, the proposed system could compensate for the voltage sag/swell of 20% and 60%. Finally, voltage compensation factor and THD(Total Harmonic Distortion) according to voltage variation and load change were measured, and voltage quality shows a good results.

Compensating Characteristics of Voltage Sag Compensator Utilizing Single-Phase Matrix Converter

  • Yamamoto, Kichiro;Ikeda, Keisuke;Iimori, Kenichi
    • Journal of international Conference on Electrical Machines and Systems
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    • v.2 no.1
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    • pp.77-82
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    • 2013
  • By using simulation, compensating characteristics of a voltage sag compensator utilizing single-phase matrix converter is examined. System configuration is described and mathematical model of single-phase matrix converter is derived by using the state space averaging method. In addition, the single-phase matrix converter is stabilized by phase-lead compensation. Finally, compensating characteristics of the compensator is investigated for 500 W R-L load and it is demonstrated that the compensator can operate correctly for loads for the range of power factor 0.6 (lagging) - 0.8 (leading) and for up to 50% voltage sag.

New Voltage Sag/Swell Compensator Using Direct Power Conversion Method (직접전력변환 방식을 이용한 새로운 전압 sag/swell 보상기)

  • Cha, Han-Ju;Lee, Dae-Dong
    • Proceedings of the KIEE Conference
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    • 2006.04b
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    • pp.267-269
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    • 2006
  • In this paper, a new single phase voltage sag/swell compensator using direct power conversion is introduced. A new compensator consists of input/output filter, series transformer and direct ac-ac converter, which is a single-phase back-to-back PWM converter without dc-link capacitors. Advantages of the proposed compensator include: simple power circuit by eliminating dc-link electrolytic capacitors and thereby, improved reliability and increased life time of the entire compensator; simple PWM strategy to compensate voltage sag/swell at the same time and reduced switching losses in the ac-ac converter. Further, the proposed scheme is able to adopt simple switch commutation method without requiring complex four-step commutation method commonly required in the direct power conversion. Simulation results are shown to demonstrate the advantages of the new compensator and PWM strategy.

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Implementation of Voltage Sag/Swell Compensator Using Direct Power Conversion Method (직접전력변환 방식을 이용한 전압 sag/swell 보상기의 구현)

  • Cha, Han-Ju;Lee, Dae-Dong
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.1014-1015
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    • 2006
  • In this paper, a new single phase voltage sag/swell compensator using direct power conversion is introduced. A new compensator consists of input/output filter, series transformer and direct at-ac converter, which is a single-phase back-to-back PWM converter without dc-link capacitors. Advantages of the proposed compensator include: simple power circuit by eliminating dc-link electrolytic capacitors and thereby, improved reliability and increased life time of the entire compensator; simple PWM strategy to compensate voltage sag/swell at the same time and reduced switching losses in the ac-ac converter. Further, the proposed scheme is able to adopt simple switch commutation method without requiring complex four-step commutation method commonly required in the direct power conversion. Simulation results are shown to demonstrate the advantages of the new compensator and PWM strategy.

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