신재생에너지 출력제한 개선을 위한 VPL의 최적용량 산정방안에 관한 연구 = Estimation method of Optimal Capacity for VPL to improve Power curtailment of Renewable energy sources

다국어 초록 (Multilingual Abstract)

The installation of renewable energy sources is rapidly being increased according to the basic roadmap for national greenhouse gas reduction by 2030 and the 10th Basic Plan for Long-Term Electricity. However, power curtailment of renewable energy sources frequently has occurred due to the imbalance between the power supply and the demand. To solve these problems, an investment in power facility infrastructure is required, which has enormous cost and a long period of construction. Therefore, this paper presents the operation characteristics of a VPL to improve the power curtailment of renewable energy sources and avoid investment in the power system infrastructure. We propose a method to calculate the optimal capacity of ESS for a VPL. An estimation method of optimal capacity is the minimum capacities of ESS (kW and kWh) are estimated based on the active power required to maintain voltages within the allowable limits for customers. The modeling of a VPL-connected distribution system was performed, which is composed of distribution substations, a VPL, a PV system, customer loads, and an energy prosumer using PSCAD/EMTDC S/W. The simulation results confirmed that the customer voltages are maintained within the allowable voltage limit according to the operation characteristics of a VPL. Therefore, power curtailment of renewable energy sources can be improved economically without investment in power facility infrastructure.