• Title/Summary/Keyword: HVDC system

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Improved Current Source using Full-Bridge Converter Type for Thyristor Valve Test of HVDC System (HVDC 시스템의 SCR 사이리스터 밸브 시험을 위한 Full-Bridge Converter 방식의 개선된 전류원 회로)

  • Jung, Jae-Hun;Cho, Han-Je;Goo, Beob-Jin;Nho, Eui-Cheol;Chung, Yong-Ho;Baek, Seung-Taek
    • The Transactions of the Korean Institute of Power Electronics
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    • v.20 no.4
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    • pp.363-368
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    • 2015
  • This paper deals with an improved current source using full-bridge converter type for thyristor valve test of HVDC system. The conventional high-current and low-voltage source of synthetic test circuit requires additional auxiliary power supply to provide the reverse voltage for the auxiliary thyristor valve during turn-off process. The proposed circuit diagram to provide the reverse voltage is extremely simple because no additional component is required. The reverse voltage can be obtained from the input DC voltage of the high-current and low-voltage power supply. The operation principle and design method of the proposed system are described. Simulation and experimental results in scaled down STC of 200 V, 30 A demonstrate the validity of the proposed scheme.

Excitation System Stress in Synchronous Machine Connected to HVDC System (HVDC 단에 연결된 동기기의 여자시스템 스트레스)

  • Kim, Chan-Gi
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.8
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    • pp.482-492
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    • 2002
  • This paper deals with overvoltage stresses in the field circuit of synchronous machine connected to HVDC terminal. A load rejection of the HVDC may cause generator in the station to become self-excited, resulting in a severe system overvoltage. This paper shows that violent field current oscillations can be produced by resonance between the machine inductance and the terminal capacitance. As most conventional excitation system do not allow reverses current, new topology of excitation system to allow reverse current is proposed. the proposed system can limit the rate of rise of terminal voltage during conditions of self excitation. Apart from these simulations, the nature(Magnitude and frequency) of the field transient state is explained mathematically. Finally, the EMTDC program is used for the simulation studies.

Development of the RTDS Controls Models of the Cheju-Haenam HVDC link (제주-해남 HVDC 모델 개발 및 디지털 제어기 개발 방안)

  • Shin, Jeong-Hoon;Kim, T.K.;Yoon, Y.B.;Choo, J.B.;Hur, S.I.
    • Proceedings of the KIEE Conference
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    • 2001.05a
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    • pp.309-312
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    • 2001
  • The Cheju-Haenam HVDC System is currently being operated in KEPCO's system. But it is quite difficult to control properly due to the newly-introduced system in KEPCO. Therefore, the operators and/or engineers who have little field experiences want to know the system responses for their control actions. To satisfy the needs, the detailed control models which are represented near to real systems are being developed in KEPS project performed by KEPRI. This paper presents the plan for developing the detailed control models and the digital controller based on RTDS of the Cheju-Haenam HVDC system in KEPS project. The EMTDC models of the Cheju-Haenam HVDC system which are the pre-stage models for developing RTDS-based models and digital controllers are also introduced.

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Design of a laboratory-scale superconducting DC transmission line (모델급 초전도 직류 송전 선로의 설계)

  • Kim, Sung-Kyu;Dinh, Minh-Chau;Park, Minwon;Yu, In-Keun
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.1102-1103
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    • 2015
  • The researchers worldwide have been trying to apply high temperature superconducting wire for power system devices. High voltage direct current (HVDC) transmission system has been used for bulk and long-distance power transmission. The authors designed a laboratory-scale superconducting DC transmission line to investigate its applicability to an HVDC system. The superconducting DC transmission line was simulated in connection to a laboratory-scale HVDC system using PSCAD/EMTDC. The operating characteristics of the superconducting DC transmission line connected to HVDC system and the effects of the superconducting DC transmission line on HVDC system were analyzed and compared with the results of a conventional DC transmission line. The results of operating characteristics for the superconducting DC transmission line were discussed in detail.

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Design of HVDC System 550 Damping Controller Using Novel Eigenvalue Analysis Program (신고유치 해석 프로그램을 이용한 직류계통 축비틀림 진동 댐핑 제어기 설계)

  • 김동준;남해곤;문영환;김용구
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.3
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    • pp.140-151
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    • 2004
  • This paper presents the HVDC system modelling for analysis of subsynchronous oscillation and the design of the subsynchronous oscillation damping controller in HVDC system with the aid of novel eigenvalue analysis program. The HVDC system models include both the steady-state model for power flow calculation and the dynamic model for constructing the state matrix. The design procedures of the subsynchronous oscillation damping controller (SODC), which is integrated with PI controller at rectifier, consist of three steps:1) to identify the dominant torsional oscillation mode in the AC/DC system;2) to determine the parameters of the SODC for compensating the phase lagging due to the rectifier controller;3) to validate the control parameters and to determine the appropriate gain using a time-domain simulation program. The proposed design method has been tested against two AC/DC systems for validation.

±80kV 60MW HVDC Operational Strategy in Abnormal State (비상상태에서의 제주 ±80kV 60MW HVDC 운전 방안 연구)

  • Yoon, Jong-Su;Seo, Bo-Hyeok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.5
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    • pp.664-668
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    • 2012
  • This paper presents the operation strategy of KEPCO(Korea Electric Power COporation) ${\pm}80kV$ 60MW Bipole HVDC system that will be applied between Guemak C/S(converter station) and Hanlim C/S in Jeju island. Unlike intertie HVDC system, this system is located in AC power grid inside. Therefore, the enhancement of system security related with line flow and bus voltages can be major operation strategy. In this paper, in particular, the optimal operation algorithm in the abnormal(not steady state) power system is presented and simulated.

Evaluation of Optimal Transfer Capability in the Haenam-Jeju HVDC System Based on Cost Optimization

  • Son Hyun-Il;Kim Jin-O;Lee Hyo-Sang;Shin Dong-Joon
    • KIEE International Transactions on Power Engineering
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    • v.5A no.3
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    • pp.303-308
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    • 2005
  • The restructure of the electrical power industry is accompanied by the extension of the electrical power exchange. One of the key pieces of information used to determine how much power can be transferred through the network is known as available transfer capability (ATC). The traditional ATC deterministic approach is based on the severest case and it involves a complex procedure. Therefore, a novel approach for A TC calculation is proposed using cost optimization in this paper. The Jeju Island interconnected HVDC system has inland KEPCO (Korean Electric Power Corporation) systems, and its demand is increasing at the rate of about $\10[%]$ annually. To supply this increasing demand, the capability of the HVDC system must be enlarged. This paper proposes the optimal transfer capability of the HVDC system between Haenam in the inland and Jeju in Cheju Island through cost optimization. The cost optimization is based on generating cost in Jeju Island, transfer cost through Jeju-Haenam HVDC system and outage cost with one depth (N-1 contingency).

Insulation Design and Reliability Evaluation of ±80kV HVDC XLPE Cables

  • Jung, Chae-Kyun;Park, Hung-Sok;Kang, Ji-Won
    • Journal of Electrical Engineering and Technology
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    • v.9 no.3
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    • pp.1002-1008
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    • 2014
  • This paper describes insulation design and its reliability evaluation of ${\pm}80kV$ HVDC XLPE cable. Recently, the construction of HVDC transmission system, which is combined overhead line with underground cable, has been completed. This system is installed with existing 154 kV AC transmission line on the same tower. In this paper, the lightning transient analysis is firstly reviewed for selection of basic impulse insulation level and nominal insulation thickness. Then the electrical performance tests including load cycle test and superimposed impulse test based on CIGRE TB 496 are performed to evaluate the reliability of newly designed HVDC cable. There is no breakdown for ${\pm}80kV$ HVDC XLPE cable during electrical performance test. Finally, this system is installed in Jeju island based on successful electrical performance test (Type test). After installation tests are also successfully completed.

The development of 60MW HVDC System Design (60MW급 HVDC 시스템 설계 기술 개발)

  • LEE, UK-HWA;CHUNG, YOUNG-HO;SHIM, J.W.;MOON, H.B.
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.301-302
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    • 2012
  • 국내에서 HVDC (High Voltage DC transmission System) 관련 기술은 한국전력공사 및 전력연구원 중심으로 제주와 해남간 설치된 HVDC시스템의 설치 및 운영 기술에 많이 국한되어 왔었다. 그러나 기술을 바탕으로 2010년부터 민간기업인 LS산전과 한국전력공사의 공동 개발을 통하여 60MW ${\pm}80kV$급 전류형 HVDC시스템 설계 및 제작을 추진하여 시스템 설계, 기기 설계 사양, 제작사양서 등의 설계 핵심 기술을 상당부분 확보하는 계기가 되었다. 현재 설계된 Pilot HVDC 시스템은 제작 완료되었고, 제주 실증단지에 설치 및 시험 중에 있으며 2012년 내에 실증운전을 통해서 최종적으로 시스템 설계 기술을 검증할 계획이다. 이 같은 연구를 통하여 상당부분 HVDC 시스템에 대한 독자적인 설계 능력을 갖추게 될 것이다.

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Modeling Strategies of Cheju-Haenam HVDC System and Its Dyanmec Performance Study

  • Jung, Gil-Jo;Kim, Chan-Ki;Yang, Byeong-Mo;Kwak, Hee-Ro
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.11B no.2
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    • pp.40-50
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    • 2001
  • This paper deals with the development of the simulation models Cheju - Haenam HVDC system and its dynamic performance study and verify the control characteristics of the HVDC system. It discusses the model development requirement and criteria. It provides guedelines for developing large-scale simulation models for detailed electromagnetic studies and presents the results of the modeling project.