• Title/Summary/Keyword: 무효전력보상기

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Reactive Power Compensator for Pulsed Power Electric Network of International Thermonuclear Experimental Reactor (국제 열핵융합실험로 펄스전원계통의 무효전력보상기 검증)

  • Jo, Hyunsik;Bae, Sanghoon;Oh, Jong-Seok;Cha, Hanju
    • Proceedings of the KIPE Conference
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    • 2014.11a
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    • pp.72-73
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    • 2014
  • 본 논문에서는 ITER 펄스전원계통의 무효전력보상기(Reactive Power Compensator)의 해석 및 검증에 대하여 기술하였다. ITER 펄스전원계통은 66kV에 흐르는 무효전력량을 250MVar이하로 제한하기 위하여 정지형 무효전력보상기(Static Var Compensator)의 대표적인 장치인 싸이리스터 제어 리액터(TCR)와 고조파 필터(HF)로 구성된 무효전력보상기(RPC)를 사용한다. RPC에 적용되어 여러 ITER 초전도 코일 전원장치에서 발생하는 무효전력의 크기를 예측하여 보상하는 무효전력 보상기법을 해석한다. 본 논문에서는 RPC의 무효전력 보상동작을 실제 제어기와 RTDS를 연동하여 실험하여 검증하였고, RPC의 유무에 따라서 66kV 계통의 무효전력 최대값이 120MVar에서 40MVar로 감소하는 것을 확인하였다.

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Operating Characteristics of Static Var Compensator Using Hybrid Cascade 5-level PWM Inverter (하이브리드 Cascade 5-레벨 PWM 인버터를 이용한 정지형 무효전력 보상기의 동작특성)

  • 최남섭
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.318-321
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    • 2002
  • 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. The proposed system has advantages of hybrid structure which enhances the better utilization of power semiconductor switches, that is, both high power-low frequency switch, GTO and low power-high frequency switch, IGBT can be used in the same circuit. In this paper, circuit structure and characteristics is presented and the validity of the characteristics analysis is shown through PSIM simulation.

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Control System Design and Performance Analysis for Transmission Static Compensator (송전용 무효전력보상기의 제어시스템 설계와 성능해석)

  • 한병문;최대길
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.1
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    • pp.77-84
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    • 1998
  • This paper describes a control system design for the transmission STATCOM by applying a no-linear state feedback, and the performance analysis of the control system by simulations and scaled-model experiments. A mathematical model for the STATCOM was derived using a 3-phase equivalent circuit and a perturbation state equation with respect to a typical operating point. A transfer function to describe the dynamics of STATCOM was derived by considering nonlinear state feedback. A controller design was completed by analyzing the feedback system stability with root locus method. The performance analysis of the conceived control system was verified by simulations with the EMTP and experiments with scaled model, assuming that the STATCOM is connected to an 154kV transmission system. The results show that the conceived control system has excellent performance to control the reactive power of the transmission system.

MODELING OF A STATIC VAR COMPENSATOR USING EMTP (EMTP를 이용한 무효전력 보상용 SVC 모델링)

  • Lee, Byung-Chul;Lee, You-Jin;Kim, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.2281-2282
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    • 2008
  • 전력계통에서 전압을 안정시키고 계통의 안정도를 증진시키기 위해 송전시 발생하는 무효전력을 보상하는 방법으로 SVC(Static Var Compensator, 정지형 무효전력보상기)를 사용한다. SVC를 TCR(Thyristor Controlled Reactor)과 FC(Fixed Capacitor)필터, 그리고 스너버(Snubber)회로를 사용하여 모델링하고 이 모델을 EMTP를 이용하여 시뮬레이션함으로써 그 결과를 통해 SVC가 전력계통의 무효전력을 보상함을 알아본다.

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

  • 최남섭
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.6 no.3
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    • pp.421-426
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    • 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.

Reactive-Power Compensator using Soft-Switching Current-Source Inverter (소프트-스위칭 전류원인버터를 이용한 무효전력보상기)

  • Jeong, Jin-Gyu;Baek, Seung-Taek;Kim, Hui-Jung;Han, Byeong-Mun;Baek, Mun-Hong;Han, Hu-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.3
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    • pp.204-210
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    • 2000
  • This paper proposes a new reactive-power compensator composed of a soft-switching current-source inverter. The compensator consists of 3-Phase IGBT bridge, dc reactor, and a resonant circuit. The resonant circuit offers the IGBT bridge to have PWM operation with minimal switching losses. A theoretical analysis and computer simulation with Is-Spice were done to verify the operation of the proposed system. Also a acaled-model of the system was built and tested for verifying the feasibility of proposed system.

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Control System Design for Self-Commutated Static Var Compensator (전압원인버터방식 송전용 무효전력보상기의 제어시스템 설계)

  • 한병문
    • Proceedings of the KIPE Conference
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    • 1996.06a
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    • pp.89-92
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    • 1996
  • This paper describes a detailed simulation model of the static condenser (STATCON) to analyze the dynamic interaction with the ac transmission line. The static condenser was represented by a 12-pulse voltage-source inverter sharing an energy storage dc capacitor. The voltage-source inverter consists of two 6-pulse bridges modeled with ideal gate-turn-off switches. The control system for the static condenser was designed through a mathematical model deduced from the equivalent circuit. Simulation results show that the conceived model is very effective to analyze the dynamic interaction between the static condenser and the ac transmission system.

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Controller Design of Static Var Compensator Using Three Phase PWM Cuk AC-AC Converter (3상 PWM Cuk AC-AC 컨버터를 이용한 정지형 무효전력보상기의 제어기 설계)

  • Choi Nam-Sup
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.579-582
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    • 2004
  • This paper presents controller design of a static var compensator using PWM Cuk AC-AC converter. The PWM Cuk AC-AC converter is modelled by using complex circuit DQ transformation and perturbed around the operating point whereby the small signal system characteristics is analytically obtained. Finally, the PSIM simulations show the validity of the modelling and analysis.

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Characteristic Analysis of Static Var Compensator Using Three Phase PWM Cuk AC-AC Converter (3상 PWM Cuk AC-AC 컨버터를 이용한 정지형 무효전력보상기의 특성해석)

  • Choi Nam-Sup
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.597-600
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    • 2004
  • In this paper, a static var compensator using PWM Cuk AC-AC converter is presented. The PWM Cuk AC-AC converter is modelled by using complex circuit DQ transformation whereby the basic condition to be used as a var compensator is derived and the static characteristic equations such as input current and reactive power is analytically obtained. Finally, the PSIM simulations show the validity of the modelling and analysis.

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Modeling and Analysis of Static Var Compensator Using Hybrid Cascade Multilevel Inverter (하이브리드 Cascade 멀티레벨 인버터를 이용한 무효전력보상기의 모델링 및 해석)

  • Choi Nam-Sup
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.618-621
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    • 2002
  • This paper proposes a static vu compensator using hybrid cascade 5-level PWM inverter, Circuit DQ transformation is used for modeling and analysis of the system, and it reveals the important characteristics and related equations of the system. Also, a multilevel PWM technique suitable to hybrid structure Is proposed for less harmonics in the input currents of the system. Finally, the validity of tile characteristics analysis is shown through PSIM simulations.

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