• 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.

• 전기학회논문지
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• 제60권9호
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• pp.1656-1662
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• 2011

In a previous paper, the EMTP modeling technique using search coil test is established through various transient analysis including system grounding condition and grounding resistance for HVDC submarine cables. It was also proved by comparison with real test results. Based on this EMTP modeling technique, in this paper, it will be applied for modeling of ${\pm}180kV$ real HVDC submarine system(Jeju~Haenam). This paper variously analyses the effects of fault resistance including the resistance between core and sheath, the resistance between sheath and amore and the resistance between amore and sea water through EMTP modeling of search coil method. The results can contribute to the accuracy of detailed fault point prediction of search coil test for HVDC submarine cables.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 A
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• pp.557-559
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• 2002

KEPCO has been operating since March 1998 a HVDC link between Cheju Island and the mainland that it constructed to save high generation cost & ensure the system stability and the supply of electric power of Cheju island (approximately 100km from south of mainland). The purpose of this study is to consider the complete maintenance of the HVDC Submarine Cable after its construction in 1997 while proposing future direction for the stable operation of the HVDC Submarine Cable.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.159-160
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• 2015

현재 한국 전력계통의 경우 신재생전원의 보급 확대 및 전력수요의 증대에 따라, 국가적으로 대정전 사태 사전방지 등 신뢰도 높은 전력전송을 위한 노력으로서 HVDC 송전기술 도입이 폭넓게 검토되고 있다. 우리나라 전력 계통은 송전망 건설이 지연되고 있는 상황에서 수도권 부하는 증가하고, 발전 단지는 대규모화되고 있어 전력 계통 사고 및 그 파급이 점점 대형화되고 있다. 증가하는 전력수요에 대응하여 발전소를 건설해도 송전망 건설이 어려워 전력전송 능력이 점점 취약해지고 있다. 초대형화된 발전단지와 취약해진 송전망은 송전선의 혼잡을 증가시켜 불시에 기능정지가 될 경우, 사고의 영향력은 광역 정전으로 발전될 만큼 매우 커질 수 있다. 따라서 제 6차 전력수급 기본계획에 신규 반영되는 대규모 발전소의 계통 연계방안과 계통 신뢰도 측면으로 고려하여 장거리 전력 전송을 위한 HVDC 적용이 검토 됨에 따라 국내 HVDC 적용의 신규 시장이 될 가능성이 높다.

• 조명전기설비학회논문지
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• 제20권7호
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• pp.21-28
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• 2006

본 논문은 HVDC 시스템의 고장 시 고장 원인과 소음의 원인 및 기계적인 균열에 관하여 분석한 논문이다. 본 논문에는 전기설비의 소음과 진동의 원인을 분석하였고, 시스템의 고장을 정량적으로 분석하였다. 최종적으로 고장전류와 소음과 진동 방정식을 이용하여 Smoothing 리액터의 지지물의 균열의 원인이 분석되었다.

• Journal of Power Electronics
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• 제19권5호
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• pp.1171-1181
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• 2019

Modular Multilevel Converter (MMC)-based HVDC power transmission using a real-time simulator is one of the key technologies in power electronics research. This paper introduces the design methodology of a physical MMC-HVDC control system based on a Field-Programmable Gate Array (FPGA), which has the advantage of high-speed parallel operation, and validates the accuracy of MMC-HVDC control when operated with a Real-Time Digital Simulator (RTDS). Finally, this paper compares and analyzes the characteristics of capacitor voltage balancing methods such as Nearest Level Control (NLC), NLC with a reduced switching frequency, and tolerance band modulation implemented on physical control system.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 추계학술대회 논문집
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• pp.133-134
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• 2013

현재 LS산전과 한국전력공사의 공동 개발을 통하여 60MW급 ${\pm}80kV$ 전류형 HVDC(High Voltage Direct Current) Transmission System 내 알고리즘 국산화 개발을 진행하고 있다. 제어 알고리즘 여러 레벨(AC Yard Control, Master Control, Pole Control, Phase Control)에서 운전하기 전 여러 고려사항 중 DC Yard 내 DC Switch의 투입/개방의 조건이 있다. 본 논문에서는 이러한 DC Line에 DC Switch의 상태를 효율적으로 제어하는 방법에 대해 소개하고자 한다.

• 대한전기학회논문지
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• 제37권7호
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• pp.434-441
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• 1988

This paper proposes a new invention of the integrated generator converter system for the HVDC transmission. And it analyses the general formula for eddy currents in the rotor iron using the double Fourier series in order to trace the smallest eddy current losses of the system which connects a new designed synchronous generator windings or conventional synchronous generator windings with the v Graetz bridges.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 C
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• pp.1053-1055
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• 1998

Using EMTP model which describes bipolar HVDC system, switching level simulation results are presented in this paper. Voltage synchronization at point of common coupling, gate pulse generation and current control loops are represented in TACS module. The system consists of 100 km submarine cable rated 300 MW and 12 pulse rectifier and inverter stations which are connected to equivalent three-phase sources and loads through the 154 kV AC lines, respectively. In convertor stations, harmonic filters and capacitor banks are equipped to cancel out the harmonics generated by converters and to supply the required reactive power.

• Journal of Power Electronics
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• 제18권1호
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• pp.225-233
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• 2018

This paper proposes a universal system control strategy for voltage source converter (VSC) based high voltage direct current (HVDC) systems. The framework of the designed control strategy consists of five layer structures considering the topology and control characteristics of the VSC-HVDC system. The control commands sent from the topmost layer can be transmitted to the next layer based on the existing communication system. When the commands are sent to each substation, the following transmission of commands between the four lower layers are realized using the internal communication system while ignoring the communication delay. This hierarchical control strategy can be easily applied to any VSC-HVDC system with any topology. Furthermore, an integrated controller for each converter is designed and implemented considering all of the possible operating states. The modular-designed integrated controller makes it quite easy to extend its operating states if necessary, and it is available for any kind of VSC. A detailed model of a VSC-HVDC system containing a DC hub is built in the PSCAD/EMTDC environment. Simulation results based on three operating conditions (the start-up process, the voltage margin control method and the master-slave control method) demonstrate the flexibility and validity of the proposed control strategy.