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신뢰도비용을 고려한 풍력발전에 연계된 배터리의 최적 용량에 관한 연구
김욱원(Wook-Won Kim),김성열(Sung-Yul Kim),김규호(Kyu-Ho Kim),김진오(Jin-O Kim) 대한전기학회 2011 전기학회논문지 Vol.60 No.2
By introducing RPS(Renewable Portfolio Standard) for reduction of greenhouse gas, Renewable energy has becoming widespread gradually. Due to a large number of advantages, wind power, which is one of Renewable energy, has standing in the spot-light rather than other Renewable energy. Wind power, however, is difficult to control output and because of severe output fluctuation, it would cause some problems when it is connected with system. Using battery as a solution for these problems has been researched all over the world. In this paper, the reliability modeling of windfarm connected battery and reliability evaluation of system are executed. Also the optimum battery capacity is selected through evaluating reliability cost.
신재생에너지가 연계된 마이크로그리드에서 에너지 저장장치의 최적 용량 선정에 관한 연구
김욱원(Kim Wook-Won),이남형(Lee Nam-Hyung),이윤성(Lee Yun-sung),신제석(Shin Je-Seok),김진오(Kim Jin-O) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
By introducing RPS(Renewable Portfolio Standard) for reduction of greenhouse gas, Renewable energy sources have becoming widespread gradually. However, Renewable energy sources, such as wind power and PV are difficult to control the output and they have intermittent characteristics of the output. These characteristics would cause some problems when it is connected in the power system[1][2]. In order to solve these problems, Energy Storage Systems(ESS) are considered to use. Although there are many different storage devices, the utilization of Secondary Battery is the one of the best ways to stabilize an output fluctuation of RES because of its fast responsibility. For that reason, it would better fit a large-capacity of Secondary battery for stabilization. However, batteries cannot be installed with a large capacity blindly because of its expensive cost. So to select proper capacity of the battery is an important consideration. This paper presented a methodology for the optimal capacity and operation of ESS in microgrids.
전력 보조서비스 제공을 위한 전기자동차 충 / 방전 최적화
김욱원(Wook-Won Kim),신홍열(Hong-Yul Shin),김진오(Jin-O Kim),김규호(Kyu-Ho Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.8
Electric vehicles should be connected to power system for charge and discharge of battery. Besides vehicle"s battery is charged for a power source, it is also reversibly possible to provide power source from battery to power system. Researches on battery usage for regulation resources have been progressed and could cause cost increase excessively because they distribute regulation capacity equally without considering the battery wear cost of SOC, temperature, voltage and so on. This causes increase of grid maintenance cost and aggravate economical efficiency. In this paper it is studied that the cost could be minimized according to the battery condition and characteristic. The equation is developed in this paper to calculate the possible number of charge and discharge cycle, according to SOC level and weighting factors representing the relation between battery life and temperature as well as voltage. Thereafter, the correlation is inferred between the battery condition and wear cost reflecting the battery price, and the expense of compensation is decided according to the condition on battery wear-out of vehicle. In addition, using realtime error between load and load expectation, it is calculated how much regulation capacity should be provided.