태양광 발전과 ESS 시스템의 연계운전시 단독운전 방지 사례 연구
A Case Study on the Islanding Detection Protection of PV system and ESS system
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초록
The installation of BIPV or BAPV which is installed on building is increased in Korea, so that the cumulative installation has increased. However, the quality of power gird including distributed power sources such as PV system and wind power might degrade due to fluctuation of their output power by the source. As a solution to it, there is a method to connect PV system and ESS system. However, the ESS and PV system connected to grid in parallel can cause problems with electrical safety. This paper presents the results of case studies to detect islanding operation, which are electrical safety in situations that the photovoltaic system and ESS systems are connected in parallel to grid. The experiments were conducted under a various non-islanding detection in operating conditions. In the experiment result, when a individual inverter(PV inverter or ESS inverter) was operated under the islanding condition, it was stopped within 0.5 seconds on the Korean grid standard. However, when two inverters(PV inverter and ESS inverter) were operated at the same time in the islanding situation, the anti-islanding algorithm is not operated and two inverters continually supply the connected RLC load. So, the algorithm of islanding detection developed by each inverter manufacturer could cause this phenomenon. Therefore, the new test standard should be presented for islanding detection.
Abstract
The installation of BIPV or BAPV which is installed on building is increased in Korea, so that the cumulative installation has increased. However, the quality of power gird including distributed power sources such as PV system and wind power might degrade due to fluctuation of their output power by the source. As a solution to it, there is a method to connect PV system and ESS system. However, the ESS and PV system connected to grid in parallel can cause problems with electrical safety. This paper presents the results of case studies to detect islanding operation, which are electrical safety in situations that the photovoltaic system and ESS systems are connected in parallel to grid. The experiments were conducted under a various non-islanding detection in operating conditions. In the experiment result, when a individual inverter(PV inverter or ESS inverter) was operated under the islanding condition, it was stopped within 0.5 seconds on the Korean grid standard. However, when two inverters(PV inverter and ESS inverter) were operated at the same time in the islanding situation, the anti-islanding algorithm is not operated and two inverters continually supply the connected RLC load. So, the algorithm of islanding detection developed by each inverter manufacturer could cause this phenomenon. Therefore, the new test standard should be presented for islanding detection.
참고문헌 (10)
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