• Title/Summary/Keyword: HVDC system

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Implementation of Digital Phase Controller of Thyristor by using FPGA in HVDC System

  • Kim, Dong-Youn;Kim, Jang-Mok;Kim, Chan-Ki
    • Proceedings of the KIPE Conference
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    • 2012.11a
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    • pp.169-170
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    • 2012
  • This paper presents implementation of digital phase controller for thyristor by using FPGA (Field Programmable Gate Array) in HVDC system. Implementation of digital HVDC system is possible by using superior digital simulator such as RTDS (Real Time Digital Simulator). But thyristor phase controller is typically implemented by analog circuit, because it is difficult to implement the phase controller with low operating speed of RTDS. To guarantee high control performance, phase controller needs fast operating speed. This paper presents FPGA based digital phase controller to obtain high speed and high performance. The entire digital simulation of the HVDC system is also implemented by interfacing between FPGA based phase controller and RTDS. Proposed digital HVDC simulator is verified through RTDS simulation.

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PI controller for HVDC system simulation based on Modified nodal analysis method optimized by Genetic Algorithms (수정된 마디해석법을 사용한 HVDC 시스템 시뮬레이션을 위한 Genetic 알고리즘에 의해 최적화된 PI 컨트롤러)

  • Yang, Jeung-Je;Kang, Hyun-Sung;Ahn, Tae-Chon;Park, In-Gyu
    • Proceedings of the KIEE Conference
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    • 2006.04a
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    • pp.252-254
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    • 2006
  • The recent improvement in the performance of digital processor, the application of control technology, which used in the HVDC(High Voltage Direct Current) system with the digital processors, has increased. Having this research development as the basis, this paper presents an achievement of progression by tuning the parameter of PI controller based on Genetic Algorithms(GAs) and by controlling with PI controller with a developed simulator by applying the Matrix operating function, voltage source switching element, modified nodal analysis which can include transformer and the backward Euler which does not create the problem of numerical oscillation. As a result, I expect this development in the simulator HVDC System to bring more application in the field of control technology research with an expanded practicality.

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Determination of Optimal Operating Angle for HVDC System (전류형 HVDC 시스템의 최적 운전각 결정)

  • Kim, Jin-Young;Kim, Jae-Han;Kim, Chan-Ki
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.1
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    • pp.7-15
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    • 2012
  • In this paper a process of determination for thyristors operating with optimal angle is described. The proposed method is based on the trade-off between the cost(due to rating and loss) and controllability of the system. Large control angle increases controllability of HVDC system and also increase the rating of the system which leads to a high price. Therefore it is important to determine a control angle at a first step of design procedure. This paper shows a rating trend of C.Tr, Valve and Filter due to control angle variation, and then introduces a determination process of the HVDC operating angle.

Probabilistic Reliability Based HVDC Expansion Planning of Power System Including Wind Turbine Generators (풍력발전기를 포함하는 전력계통에서의 신뢰도 기반 HVDC 확충계획)

  • Oh, Ungjin;Lee, Yeonchan;Choi, Jaeseok;Yoon, Yongbeum;Kim, Chan-Ki;Lim, Jintaek
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.1
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    • pp.8-15
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    • 2018
  • New methodology for probabilistic reliability based grid expansion planning of HVDC in power system including Wind Turbine Generators(WTG) is developed in this paper. This problem is focused on scenario based optimal selection technique to decide best connection bus of new transmission lines of HVDC in view point of adequacy reliability in power system including WTG. This requires two kinds of modeling and simulation for reliability evaluation. One is how is reliability evaluation model and simulation of WTG. Another is to develop a failure model of HVDC. First, reliability evaluation of power system including WTG needs multi-state simulation methodology because of intermittent characteristics of wind speed and nonlinear generation curve of WTG. Reliability methodology of power system including WTG has already been developed with considering multi-state simulation over the years in the world. The multi-state model already developed by authors is used for WTG reliability simulation in this study. Second, the power system including HVDC includes AC/DC converter and DC/AC inverter substation. The substation is composed of a lot of thyristor devices, in which devices have possibility of failure occurrence in potential. Failure model of AC/DC converter and DC/AC inverter substation in order to simulate HVDC reliability is newly proposed in this paper. Furthermore, this problem should be formulated in hierarchical level II(HLII) reliability evaluation because of best bus choice problem for connecting new HVDC and transmission lines consideration. HLII reliability simulation technique is not simple but difficult and complex. CmRel program, which is adequacy reliability evaluation program developed by authors, is extended and developed for this study. Using proposed method, new HVDC connected bus point is able to be decided at best reliability level successfully. Methodology proposed in this paper is applied to small sized model power system.

The Affections of System Stability on Replacing the Synchronous Condenser in Jeju Island (제주 동기조상기 교체에 따른 계통안정성 영향 연구)

  • Chang, Byung-Hoon;Yoon, Jong-Su;Han, Jeong-Yeol;Shim, Jeong-Woon;Kang, Sang-Gyun;Lee, Byong-Joon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.10
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    • pp.1715-1720
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    • 2007
  • The CSC-based HVDC system links the Jeju system to the mainland system. Because CSC-based HVDC is installed in Jeju, the reactive power is needed to transfer active power through the HVDC. In order to supply reactive power, switched capacitors and synchronous condensers are installed in Jeju system. The deterioration of established synchronous condensers, however, causes a reactive power supply capability decline and high maintenance cost. It brings about the instability of Jeju system and the incremental of maintenance and repair costs. In the future the installation of wind generators and additional HVDC system would aggravate the stability of Jeju system. Therefore, it needs to consider a countermeasure against above problems. In this paper, Analysis of several contingencies of Jeju system was peformed, and some contingencies caused voltage-reactive power problem was known. CPF method was introduced in order to make countermeasures to replace the synchronous condensers and to solve the voltage-reactive power problem. The location and capacity of reactive power sources were also decided. It could guarantee medium and long term stability of Jeju system.

Transfer Capability Enhancement Using Voltage Source Converter HVDC (전압원 HVDC를 이용한 부하집중지로의 송전용량 증대방안)

  • Oh, Sea-Seung;Jang, Gil-Soo;Cha, Jun-Min
    • Proceedings of the KIEE Conference
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    • 2005.11b
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    • pp.328-330
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    • 2005
  • This paper presents a transfer capability enhancement of using VSC HVDC system which can control reactive power as well as active power. The transfer capability is constrained by stability like voltage stability. These constraints may relieved by reactive power control ability of the VSC HVDC system. Site selection algorithm is also proposed.

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A Study on Voltage Source HVDC System Operation Sequence (전압형 HVDC 구동 시퀀스에 대한 고찰)

  • Park, Sheng Hee
    • Proceedings of the KIPE Conference
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    • 2014.11a
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    • pp.99-100
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    • 2014
  • 전압형 HVDC(High Voltage Direct Current)는 현재 차세대 전력망으로써 각광을 받고 있고 그에 대한 연구가 활발하게 진행 중이다. 많은 논문에서 모듈형 멀티레벨 컨버터(Modular Multilevel Converter, MMC)의 제어 및 보호 방안에 대하여 기술하지만 운영적인 시퀀스 측면에 있어서는 아직 많은 연구가 진행되지 않고 있다. 이에 본 논문은 전압형 HVDC의 AC Yard, DC Yard 및 상위 제어기에 관한 구동 시퀀스에 대하여 기술하고자 한다.

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Interfacing of A.C. System with HVDC Schemes : A Comparison of Filter Types (HVDC 구성을 갖는 A.C. System의 필터 유형 비교에 관한 연구)

  • Kim, Chan-Ki;Choy, Young-Do
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.373-375
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    • 2005
  • AC harmonic filters connected to the terminals of HVDC schemes fulfill two primary functions: to compensate for part or all of the reactive power absorbed by the converter, and to limit to an acceptable level the voltage distortion caused by the converter harmonics. this paper makes a direct comparison between tuned filters and damped filters, each designed for a long HVDC transmission scheme. It Is hoped that by comparing the two approaches a syudy to determine the suitability of filter types to AC systems can be promoted.

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Electromagnetic simulation of HVDC System sub-modules through modeling (모델링을 통한 HVDC System 서브모듈의 전자기 시뮬레이션)

  • Sun, Daun;Song, Sunggeun;Kim, Kibeom
    • Proceedings of the KIPE Conference
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    • 2019.07a
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    • pp.479-480
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    • 2019
  • 전압형 MMC HVDC 시스템은 다수의 서브모듈이 직렬로 구성되어 있으며, 서브모듈 내부의 고전압 반도체 소자는 수 kV로 스위칭 된다. 이때 발생하는 dV/dt에 의해 많은 고주파 성분의 과도노이즈가 전자파 방사 문제를 야기 시킨다. 본 논문에서는 HVDC 시스템의 전자파 노이즈 분석을 위해 1개의 서브모듈에 대한 측정 및 측정 결과를 바탕으로 컴퓨터 시뮬레이션 모델링을 진행하였다.

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