• Title/Summary/Keyword: Static Var Compensator

검색결과 132건 처리시간 0.022초

배전선로 적용을 위한 새로운 무효전력보상치(ASVC)의 설계 (Design of Advanced Static Var Compensator(ASVC) for Distribution Line)

  • 민완기;이상훈;최재호
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1997년도 하계학술대회 논문집 F
    • /
    • pp.2010-2012
    • /
    • 1997
  • A cascade multilevel voltage source inverter is introduced to apply the advanced static var compensator(ASVC) for large scale power application. This cascade M-level inverter consists of (M-1)/2 single-phase full bridges. This inverter is suitable to the flexible ac transmission systems(FACTS) including SVC, series compensation and phase shifting. It can solve the problems of conventional transformer -based multipulse inverters and multilevel diode-clamped inverters. From the simulation results, the validity of ASVC with cascade multilevel inverter is shown for high power application.

  • PDF

A New Scheme for Maintaining Balanced DC Voltages in Static Var Compensator(SVC) Using Cascade Multilevel Inverter

  • Min, Wan-Ki;Min, Joon-Ki;Choi, Jae-Ho
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
    • /
    • pp.561-565
    • /
    • 2001
  • This paper proposes a new switching scheme of a static var compensator(SVC) with cascade multilevel inverter which employs H-bridge inverter(HBI). To improve the un­balanced problem of the DC capacitor voltages, the rotated switching scheme of fundamental frequency is newly used. The optimized fundamental switching pattern with low switching frequency is adapted to be suitable for high application. The selective harmonic elimination method(SHEM) allows to keep the total harmonic distortion(THD) low in the output voltage of multilevel inverter. The SVC system is modeled using the d-q transform which calculates the instantaneous reactive power. This model is used to design a controller and analyze the SVC system. Simulated and experimental results are also presented and discussed to validate the proposed schemes.

  • PDF

GTO 인버터를 사용한 무효전력 보상기의 개발 (Development of Static VAR Compensator Using GTO Inverter)

  • 최남섭;조국춘;정구호;조규형;홍순욱;차재덕;김송응
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1994년도 하계학술대회 논문집 A
    • /
    • pp.406-408
    • /
    • 1994
  • A static VAR compensator using 100kVA three-level GTO voltage source inverter is presented for high voltage/high power applications. The phase angle of the invertor is controlled so as to compensate the reactive power of some load. The paper deals with the following topics; system description, circuit DQ modelling, main controller, power circuit.

  • PDF

회로 DQ 변환을 이용한 하이브리드 Cascade 5-레벨 PWM 인버터를 포함하는 무효전력보상기의 모델링 (Modeling of Static Var Compensator with Hybrid Cascade 5-level PWM Inverter Using Circuit DQ Transformation)

  • 최남섭
    • 한국정보통신학회논문지
    • /
    • 제6권3호
    • /
    • pp.421-426
    • /
    • 2002
  • Hybrid cascade multilevel PWM inverter has advantages of hybrid structure which enhances the better utilization of power semiconductor switches, that is, both hi호 power-low frequency switch, GTO and low power-high frequency switch, IGBT can be used in the same circuit. In this paper, a static var compensator using hybrid cascade 5-level PWM inverter is presented for high voltage/high power applications. The proposed system is modelled by circuit DQ transformation, and thus an equivalent circuit is obtained which reveals the important characteristics of the system and lead to the related equations. Finally, circuit structure and characteristics is presented and the validity of the characteristics analysis is shown through PSIM simulation.

시스템 안정도 향상을 위하여 SVC를 포함한 전력계통의 최적 GA-PI 제어기 설계 (A Design of Optimal GA-PI Controller of Power System with SVC to Improve System Stability)

  • 정형환;허동렬;이종민;주석민
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제24권2호
    • /
    • pp.63-71
    • /
    • 2000
  • This paper deals with a systematic approach to GA-PI controller design for static VAR compensator(SVC) using genetic algorithm(GA) to improve system stability. Genetic algorithms(GAs) are search algorithms based on the mechanics of natural selection and natural genetics. To verify the validity of the proposed method, investigated damping ratio of the eigenvalues of the electro-mechanical modes system with and without SVC. Also, we considered dynamic response of terminal speed deviation and terminal voltage deviation by applying a power fluctuation at heavy load, normal load and light to verify the robustness of the proposed. Thus, we proved usefulness of GA-PI controller design to improve the stability of single machine-bus with SVC system.

  • PDF

A Study on the Harmonics Effect of SVC in Electric Arc Furnace Loads

  • Kim, Kyung-Chul;Jin, Seong-Eun
    • 조명전기설비학회논문지
    • /
    • 제20권9호
    • /
    • pp.54-60
    • /
    • 2006
  • Large steel industries have time-varying nonlinear loads such as electric arc furnaces. These nonlinear loads generate harmonic currents and create distortions on the sinusoidal voltage of the power system. The main objective of the static var compensator is to maintain the rms voltage at the point of common coupling within the limit. In this research, harmonic mitigation studies were conducted with and without the SVC, and time-varying harmonics were evaluated according to the international harmonic standards (IEC 61000-3-6 and IEEE Std. 519) using a cumulative probabilistic approach.

PWM전압형 콘버어터에 의한 정지형 무효전력 보상장치 (Static VAR Compensator Using PWM Voltage type Converter)

  • 정연택;이훈구;황락훈
    • 대한전기학회논문지
    • /
    • 제39권8호
    • /
    • pp.836-846
    • /
    • 1990
  • This paper presents a Static Var Compensator (SVC) system compensating the reactive power for power system, which consists of a voltage type Pulse Width Modulation (PWM) converter and a reactance linking the converter to the source. The system drives the four quadrant modes. The system determines the magnitude of the input voltage, and then compares it with the magnitude of the source voltage by regulating the phase of the SVC about the source. Therefore, the system generates leading compensation currents when the input voltage is larger than the source in magnitude, and lagging compensation currents for smaller input voltage. Reactive power about voluntary load in power system is smoothly compensated by those compensation currents, and also power factor of source is improved. Furthermore, the SVC system using PWM method may improve the source current waveforms by eliminating the 5th and 7th harmonic components from the input voltages.

  • PDF

직렬형 멀티레벨 인버터를 사용한 무효전력보상장치의 직류전압평형을 위한 새로운 제어기법 (A New Control Scheme for Maintaining Balanced DC Voltages in Static Var Compensator(SVC) Using Cascade Multilevel Inverter)

  • 민완기;민준기;최재호
    • 전기학회논문지P
    • /
    • 제54권4호
    • /
    • pp.179-184
    • /
    • 2005
  • This paper examines the application of high voltage static var compensator(SVC) with cascade multilevel inverter which employs H-bridge inverter(HBI). A new switching scheme is developed for the SVC system. To improve the unbalanced problem of the DC capacitor voltages, the rotated switching scheme of fundamental frequency is newly used. The optimized fundamental switching pattern with low switching frequency is adapted to be suitable for high application. The selective harmonic elimination method(SHEM) allows to keep the total harmonic distortion(THD) low in the output voltage of multilevel inverter. The SVC system is modeled using the d-q transform which calculates the instantaneous reactive power. This model is used to design a controller and analyze the SVC system. Simulated and experimental results are also presented and discussed to validate the proposed schemes.

직렬형 멀티레벨 인버터를 사용한 무효전력보상장치의 새로운 직류전압 평형기법 (A New Scheme for Maintaining Balanced DC Voltages in Static Var Compensator(SVC))

  • 민완기;민준기;최재호
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2003년도 학술대회 논문집 전문대학교육위원
    • /
    • pp.144-148
    • /
    • 2003
  • This paper examines the application of high voltage static var compensator(SVC) with cascade multilevel inverter which employs H-bridge inverter(HBI). To improve the unbalanced problem of the DC capacitor voltages, the rotated switching scheme of fundamental frequency is newly used. The optimized fundamental switching pattern with low switching frequency is adapted to be suitable for high application. The selective harmonic elimination method(SHEM) allows to keep the total harmonic distortion(THD) low in the output voltage of multilevel inverter. The SVC system is modeled using the d-q transform which calculates the instantaneous reactive power. This model is used to design a controller and analyze the SVC system. Simulated and experimental results are also presented and discussed to validate the proposed schemes.

  • PDF

교류-직류 시스템의 동특성 개선을 위한 SVC RVEGA-Fuzzy 제어기 설계 (A Design of SVC RVEGA-Fuzzy Controller to Improve Dynamic Response of AC-DC System)

  • 정형환;허동렬;왕용필;정문규;고희석
    • 대한전기학회논문지:전력기술부문A
    • /
    • 제51권10호
    • /
    • pp.483-494
    • /
    • 2002
  • In this thesis an optimal design technique of fuzzy logic controller using the real variable elitist genetic algorithm(RVEGA) as a supplementary control to Static Var Compensator(SVC) in order to damp oscillation in an AC-DC Dower system was proposed. Fuzzy logic controller is designed self-tuning shape of fuzzy rule and fuzzy variable using genetic algorithm based on natural selection and natural genetics. To verify the robustness of the proposed method, considered dynamic response of system by applying a load fluctuation.