Voltage Control Strategy of Active Distribution Network Considering Reactive Power Margin of Photovoltaic Inverter

Aiming at the problem of voltage fluctuation caused by large-scale distributed photovoltaic access to distribution network, this paper proposes a voltage control strategy for active distribution network considering reactive power margin of photovoltaic inverter. Firstly, based on the voltage sensitivity matrix, the interaction mechanism between distributed photovoltaic power control and node voltage change is clarified in detail, so as to determine the compensation priority of each node. Secondly, considering the capacity and load characteristics of photovoltaic inverters, the reactive power regulation margin index of distributed photovoltaic distribution network is proposed, and the voltage control model is established based on the regulation margin index and node compensation priority. Then, the particle swarm optimization algorithm of precoding technology is used to solve the problem efficiently, so as to obtain better voltage control effect of distribution network. Finally, the effectiveness of the proposed method is verified by the simulation of the modified IEEE33 node.