• 제목/요약/키워드: Synchronous Compensator

검색결과 194건 처리시간 0.025초

Comparative Study of the Behavior of a Wind Farm Integrating Three Different FACTS Devices

  • Sarrias, Raul;Gonzalez, Carlos;Fernandez, Luis M.;Garcia, Carlos Andres;Jurado, Francisco
    • Journal of Electrical Engineering and Technology
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    • 제9권4호
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    • pp.1258-1268
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    • 2014
  • Improving grid connection of wind farms is a relevant issue to be addressed, especially for fixed-speed wind turbines. Certain elements, such as FACTS (Flexible AC Transmission Systems), are able to perform voltage and reactive power regulation in order to support voltage stability of wind farms, and compensate reactive power consumption from the grid. Several devices are grouped under the name of FACTS, which embrace different technologies and operating principles. Here, three of them are evaluated and compared, namely STATCOM (Static Synchronous Compensator), SVC (Static Var Compensator) and SSSC (Static Synchronous Series Compensator). They have been modeled in MATLAB/Simulink, and simulated under various scenarios, regarding both normal operation and grid fault conditions. Their response is studied together with the case when no FACTS are implemented. Results show that SSSC improves the voltage stability of the wind farm, whereas STATCOM and SVC provide additional reactive power.

Static Synchronous Series Compensator(SSSC) 댐핑 제어 및 해석모형 (Damping Control Strategy and Analysis Model of Static Synchronous Series Compensator(SSSC))

  • 김학만;전영환;오태규
    • 대한전기학회논문지:전력기술부문A
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    • 제49권10호
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    • pp.509-515
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    • 2000
  • This paper addresses a damping control strategy of Static Synchronous Series Compensator(SSSC) and analysis model for stability study. The effect of injected voltage source generated by SSSC is modelled as equivalent load. This model is thought to be reasonable for the stability study because the dynamics of SSSC is very fast compared with that of power system. Damping controller of SSSC is based on Transient Energy Function method. The proposed control strategy is insensitive to the operating conditions like power flow level because control law depends on the phase angles. The proposed analysis model and control strategy was confirmed by WSCC 9 bus system and two area system. Especially, the robustness of proposed control strategy is demonstrated with respect to multiple operating conditions in two area system.

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Dynamic Characteristic Analysis of SSSC Based on Multi-bridge PAM Inverter

  • Han Byung-Moon;Kim Hee-Joong;Baek Seung-Taek
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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    • pp.539-545
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    • 2001
  • This paper proposes a static synchronous series compensator based on multi-bridge inverter. The proposed system consists of 6 H-bridge modules per phase, which generate 13 pulses for each half period of power frequency. The dynamic characteristic was analyzed by simulations with EMTP code, assuming that it is inserted in the 154-kV transmission line of one-machine-infinite-bus power system. The feasibility of hardware implementation was verified through experimental works using a scaled model. The proposed system does not require a coupling transformer for voltage injection, and has flexibility in expanding the operation voltage by increasing the number of H-bridge modules.

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직렬 능동 보상기의 과전류 보호방법에 관한 연구 (A Study on the Over-Current Protection Method of A Series Active Compensator)

  • 채범석;이우철;이택기;현동석
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제51권6호
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    • pp.321-329
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    • 2002
  • A protection scheme for series active compensator is presented and analyzed in this paper. The proposed series active compensator operated as a high impedance K($\Omega$) to the fundamentals when short-circuit faults occur in the power distribution system, and two control strategies are proposed in this paper The first is the method by detecting the fundamental source current through the p-q theory, the second is the method by detecting the fundamental component of load current in Synchronous Reference Frame(SRF). When the short-circuit faults occur in the power distribution system, the proposed scheme can protect the series active compensator without additional protection circuits. The validity of the Proposed Protection scheme was investigated through experimental results.

Technique for the Prevention of Inrush Current in a TCC Reactive Power Compensator

  • Yang, Ji-Hoon;Song, Sung-Geun;Park, Seong-Mi;Park, Sung-Jun
    • 한국산업융합학회 논문집
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    • 제21권4호
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    • pp.149-158
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    • 2018
  • With the propagation and spread of the new regeneration energy and increase in electricity demand, power systems tend to be decentralized, and accordingly, the use of a power system stabilizer tends to expand for the stabilization of the distribution system. Thus, typical power system stabilizer, Static Var Compensator (SVC) is developed on a variety of topologies. In addition, the trend of technology leads from SVC to Static Synchronous Compensator(STATCOM) technology development. Recently, to overcome STATCOM's conversion losses and economic disadvantages, studies of a hybrid method using STATCOM and SVC in parallel have actively been conducted. This study proposes a new Soft-Step Switching method to limit inrush current problematic in Thyristor Controlled Capacitor (TCC) method in SVC function. In addition, to reduce Statcom's capacity, groups of reactive power compensation reactor and condenser for SVC were designed.

HVDC계통에서 동기조상기의 파라미터 선정에 관한 연구 (A Study on the Parameter Determination of Synchronous Compensator in AC network with HVDC system)

  • 이석진;이흥재
    • 전기학회논문지
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    • 제59권8호
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    • pp.1353-1359
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    • 2010
  • This paper presents the determination of synchronous compensator(S.C) rating and parameter in Cheju AC network. The role of S.C is to supply Inertia and reactive power to HVDC system which is a kind of a generator without the function of reactive power control and Inertia. Therefore, the parameters of S,C have to be determined by considering HVDC operating characteristics. The background of this paper is the determination of S.C parameters in Cheju AC network in the case of replacing current operating S,C to new S.C type.

개선된 순시무효전력 보상기를 이용한 IPMSM의 센서없는 속도제어 (A Sensorless Control of IPMSM using the Improving Instantaneous Reactive Power Compensator)

  • 나재두
    • 전기학회논문지
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    • 제67권10호
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    • pp.1303-1307
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    • 2018
  • A improving sensorless compensator for the IPMSM(Interior Permanent Magnet Synchronous Motor) drive system is proposed. Generally, the motor drive system is required the robust parameter variation and disturbance. The speed estimation methods of the conventional IRP(Instantaneous Reactive Power) compensator is improved by the speed estimation techniques of the current model observer with the proposed instantaneous reactive power compensator. Performance evaluations of the novel speed error compensator and sensorless control system are carried out by the experiments.

직렬 능동 보상기를 이용한 Line-Interactive UPS의 새로운 제어 기법 (A New Control Scheme of the Line-Interactive UPS Using the Series Active Compensator)

  • 장훈;이우철;현동석
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제52권8호
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    • pp.405-412
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    • 2003
  • This paper presents a three-phase Line-Interactive uninterruptible power supply (UPS) system with series-parallel active power-line conditioning capabilities, using synchronous reference frame (SRF) based controller, which allows an effective power factor correction, source harmonic voltage compensation, load harmonic current suppression, and output voltage regulation. The three-phase UPS system consists of two active power compensator topologies. One is a series active compensator, which works as a voltage source in phase with the source voltage to have the sinusoidal source current and high power factor under the deviation and distortion of the source voltage. The other is a parallel active compensator which works as a conventional sinusoidal voltage source in phase with the source voltage, providing to the load a regulated and sinusoidal voltage with low THD (total harmonic distortion). The control algorithm using SRF method and the active power flow through the Line-interactive UPS systems are described and studied. The simulation and experimental results are depicted in this paper to show the effect of the proposed algorithm.

약한 AC 계통에서 동기조상기용 여자 시스템 특성에 따른 HVDC 과도 특성 (Dynamic Performance of HVDC According to Excitation System Characteristics of Synchronous Compensator in a Weak AC System)

  • 김찬기;김정부;심응보
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제49권6호
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    • pp.431-440
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    • 2000
  • This paper analyses the dynamic performance of HVDC System connected to a weak AC system for various exciter characteristics of synchronous machines connected at the converter bus. Conventionally capacitors are used to supply reactive power requirement at a strong converter bus. But the installation of synchronous machine is essential in a isolated weak network to re-start after a shutdown of HVDC and to increase system strength. The dynamic performance of a synchronous machine depends on the characteristics depends of its exciter. In this paper, several exciter types are used to investigate their effect on the dynamic performance of the HVDC system and modifications to standard exciter topologies are suggested to mitigate observed problems.

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제주-해남 HVDC 시스템에 STASTCOM 적용 타당성 분석 (Feasibility Analysis of STATCOM Application for Jeiu-Haenam HVDC System)

  • 백승택;추원교;한병문;장길수
    • 대한전기학회논문지:전력기술부문A
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    • 제54권8호
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    • pp.401-409
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    • 2005
  • This paper describes a feasibility analysis result of STATCOM application for the Jeju-Haenam HVDC system. The Jeju-Haenam HVDC system is one of the typical HVDC system interconnected with the low short-circuit-ratio AC system, which is vulnerable to the commutation failure due to the AC voltage variation. STATCOM has been considered as an effective reactive-power compensator to increase short-circuit-ratio of the interconnected AC system. In this study, a simulation model of Jeju-Hacnam HVDC system with STATCOM was developed using PSCAD/EMTDC. The developed simulation model was utilized to analyze the dynamic performance analysis of Jeju-Haenam HVDC system with STATCOM. The analysis results show that STATCOM can improve the dynamic performance of Jeju-Haenam HVDC system, such as load-change recovery performance and fault recovery performance.