基于区域下垂控制的光伏逆变器过电压抑制方法

To mitigate over-voltages in distribution systems with high photovoltaic (PV) penetrations, this paper proposes a regional droop control method for PV inverters, considering the absence of line impedance and multi-source data. The proposed method is realized by setting the voltage feedback location in a PV-enriched region to the bus with the highest voltage in the region. To address the issue of voltage oscillations caused by introducing droop control, we further propose a regional droop control with memory and have proved that the voltage dynamic obtained by using the proposed method will be stable in the practical distribution systems. The proposed method necessitates only a limited number of measurements and communication links, rendering it particularly well-suited for underdeveloped areas of distribution systems with large PV penetrations. Numerical results demonstrate that the proposed control method can stabilize voltage dynamics and exhibit a superior performance in mitigating distribution overvoltages thereby enhancing PV penetrations by 5.8% and annual PV consumptions by approximately 150,000 kWh compared to the benchmark control method in a typical distribution system.