Dong-Ho Won, "스마트 인버터의 Volt-VAR 및 Volt-Watt 결합 제어를 통한 연계점 전압의 안정화," 아주대학교 공학석사 학위 논문, 2023. > Paper

This thesis proposes a method to improve the stabilization effect for a point of common coupling (PCC) voltage by combining Volt-VAR and Volt-Watt control in smart inverters. The number of distributed energy resources (DER) such as solar and wind power systems has been increasing according to the renewable energy 3020 policy of government. When the PCC voltage fluctuates as the DER increases, reverse power flow occurs and power quality decreases. To suppress the PCC voltage and frequency fluctuation, the smart inverter provides grid support functions. The Volt-VAR control of smart inverter adjusts capacitive/inductive reactive power based on the PCC voltage. The Volt-Watt control of smart inverter stabilizes the PCC voltage by decreasing active power. This thesis combines Volt-VAR control and Volt-Watt control to improve the stabilization effect of PCC voltage. The proposed control method reduces the active power while it controls the inductive reactive power to the maximum. The performance of the proposed method is verified by the simulation results and experiment results.