LCL 필터 내 댐핑 강화 및 인버터 내 가상 임피던스 제어를 통한 인버터와 계통 간 상호작용 발생 조건 회피 연구

다국어 초록 (Multilingual Abstract)

This paper introduces the method of avoiding control interaction conditions by using virtual impedance control and connecting a R-damper to the capacitor section of an inverter containing an LCL filter connected to the power system. For this purpose, we set the parameters of the inverter and LCL filter. Then, equations were employed to appropriately determine the values of the damping resistor of the filter and virtual impedance. Utilizing these configured values, the overall transfer function was represented using the transfer functions of the inverter and filter. Subsequently, it was examined whether unstable resonance, as compared to the system impedance, could be avoided when using the virtual impedance control and adding resistor to filter. Furthermore, in the frequency domain, We assess how much the voltage harmonics decreased when the virtual impedance and damping resistor was included, compared to when only the LCL filter was present.