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하이브리드 타입 커패시터 뱅크를 이용한 공급신뢰도 및 전력품질 개선 방안 연구
이한상,윤동희,Lee, Hansang,Yoon, Dong-Hee 한국전기전자학회 2014 전기전자학회논문지 Vol.18 No.3
전력계통운영의 목표는 전력시스템의 안정성과 신뢰성을 유지하여 원활한 전력을 공급하는 것이다. 안정적인 전력 공급을 위하여 무효전력과 모선 전압에 대한 고려를 해야 하는데, 모선의 전압을 일정 범위 이내로 유지하기 위하여 커패시터 뱅크를 비롯한 다양한 방안이 사용되고 있다. 본 논문에서는 계통 안정도와 전력공급 신뢰도를 상시키기 위한 하이브리드 타입의 커패시터 뱅크 설계 과정에 대하여 기술하였다. 설계 과정에는 커패시터 뱅크의 용량 산정, 리액터 타입 결정 및 리액터 용량 산정과정이 포함된다. 기존의 커패시터 뱅크의 설계과정과 같이 정상상태 Q-V 해석이나 상정사고 분석과 같은 방법을 통하여 무효전력 마진을 계산하여 저전압이 발생하는 모선에 무효전력 보상량을 산정한다. 그리고 고조파 실측을 통해 산출된 개별 고조파의 성분 크기를 기반으로 직렬 리액터의 크기를 산정하는 방식으로 설계과정을 제안하였다. 논문에서는 제안된 방법을 통하여 고조파의 크기가 감소함을 증명하였으며, 특히 5차와 7차 고조파의 저감에 효율적임을 보여주었다. The objectives of power system operations are to preserve system stability and reliability as well as to supply proper electric power. For an activation of these objectives, voltage and reactive power should be considered. There are a number of types about reactive power sources, and an insertion of shunt capacitor banks are one of the method to support bus voltage adjacent. This paper includes the design procedure to determine the hybrid type capacitor bank configurations on power system to improve stability and reliability. This procedure includes the capacitor bank capacity calculation, reactor type selection, and reactor capacity calculation. The total capacity calculation of capacitor bank is based on the reactive power margin which is calculated through system studies such as, contingency analysis and Q-V analysis. In the second step, the reactor type and its capacity can be determined through the harmonic analysis. This paper shows that the harmonics are decreased by the proposed hybrid type capacitor bank, especially 5th and 7th harmonics.
이한상,Jaewon Kim,Changmu Lee,Joorak Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2
Owing to the consistently increased request about efciency improvement through utilization of regenerative energy from braking railway vehicle in the DC electric railway systems, there are a lot of researches about energy storage applications. However, the feasibility of ESS technology application is usually limited by economic factors rather than technical factors of it. Therefore, this paper proposes the application of heterogeneous energy storage system based on ramp-rate-considered cooperative controller in order to improve economics. The heterogeneous combination of energy storage devices with different technical advantages can gives a more economical solution to respond to individual specifcations required by the system. A ramp-rate-considered cooperative controller for the heterogeneous ESS application is presented numerically, and efectiveness of the proposed method has been verifed through electromagnetic transient simulation.
도시철도시스템 전력조류계산 알고리즘을 이용한 회생에너지 최적 활용 방안 연구
이한상(Hansang Lee),송지영(Jiyoung Song),이한민(Hanmin Lee),이장무(Changmu Lee),장길수(Gilsoo Jang),김길동(Gildong Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문은 철도부하의 이동을 고려한 전력조류계산 알고리즘에 기반하여, 에너지 저장장치를 설치하였을 때 철도계통의 영향 해석에 관한 논문이다. 철도부하는 위치적 변화 뿐 만 아니라 기동-타행-제동의 운전모드의 변화에 따라 전력소비 패턴이 달라지는데, 제동 시에 발생하는 회생에너지를 에너지 저장장치를 이용하여 활용함으로서 에너지 절감 효과 및 가선전압 안정화를 구현할 수 있다. 본 논문에서는 서울지하철 2호선의 실계통에 대한 사례연구를 수행하여, 실계통에 에너지 저장장치를 적용함으로서 그 필요성을 증명하였다.
전기철도 회생에너지 활용 극대화를 위한 에너지 저장장치 최적 동작 전압 결정 알고리즘에 관한 연구
이한상(Hansang Lee),이한민(Hanmin Lee),이장무(Changmu Lee),장길수(Gilsoo Jang),김길동(Gildong Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
In this paper, the optimized charging-discharging scheme for energy storage systems (ESSs) on the railway systems are presented to enhance the energy efficiency around the Korean suburban railway systems. To coordinate the control of ESSs, continuous de railway loadflow analysis considering ESSs has been performed with the real railway operation data. First, the total amount of charged energy with the specific charging voltage is calculated. Then the discharging voltages are calculated with the optimization algorithm to discharge all amounts of charged energy. To verify the effects of the boundary variation, case studies for Seoul Metro Line had been performed. Consequently, the energy efficiency is enhanced and the storage capacity is optimized with the operation boundary optimization algorithm.
A Study for DC 1500V Railroad System Modeling Using EMTDC
이한상(Hansang Lee),이장무(Changmu Lee),이한민(Hanmin Lee),장길수(Gilsoo Jang) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper is about modeling on 1500V DC electric railroad system. Electric railroad systems have peculiar characteristics against other electric system. The characteristics arc that the railroad systems have electric vehicle loads which arc power-varying and location-varying with time. Because of this load characteristic, the electric railroad system modeling which reflects its own characteristics on EMTDC simulation could not be achieved. However, to reflect load characteristic on EMTDC, this paper suggests electric railroad system modeling by using TPS (Train Performance Simulator) that was developed in Korea Railroad Research Institute. A TPS program has various kinds of input data, such as operation condition, vehicle condition, and power system condition. By these data, TPS calculates mechanical power consumption and location, especially it decide electric power consumption on the basis of the fact that consumed electric and mechanical power are equal. Moreover, on this paper, movement of vehicle is reflected on EMTDC simulation as variation of feeder impedance. Also, an electric vehicle load is modeled as time-varying constant power load model.
9도체 전기철도 모델링을 이용한 고장점 표정 방안 연구
이한상(Hansang Lee),이장무(Changmu Lee),이한민(Hanmin Lee),장길수(Gilsoo Jang),창상훈(Sanghoon Chang) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because there is a long distance, 40 ㎞ or longer, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, the catenary system must be modeled exactly to analyze fault current magnitude and fault location. In this paper, before suggestion for the novel scheme of fault location, a 9-conductor modeling technique that includes boost wires and impedance bonds is introduced, based on the characteristics of Korean AC electric railway. After obtaining a 9-conductor modeling, the railway system is constructed for computer simulation by using PSCAD/EMTDC. By case studies, we can verify superiority of a new fault location scheme and suggest a powerful model for fault analysis on electric railway systems.