Analysis on the Reactive Power Regulation of Inverter and Voltage in Distribution Network

Recently, more and more distributed photo-voltaic power generation is connected to the distribution network, but while connecting to the distribution network, it will encounter the situation of overload or under load of the current, which may lead to high or low node voltage of the bus nodes in the distribution network, and in order to ensure the safe and stable operation of the distribution network system, there is a great necessity to analyze the distribution of the voltage in the distribution network. In this paper, the LinDistFlow model of distribution network is firstly introduced, and then, considering the difficulty of modeling, the distribution network current model in the form of correlation matrix is derived, and then, the current model is combined with the Q-V droop control and the inverter output reactive power to study the characteristics of the inverter reactive regulation curve and the voltage of the distribution network. The combined model is tested and compared using variability indices on an IEEE 33 system considering droop settings. The results show that the Q-V regulation curve incorporating inverter droop control in the distribution network studied in this paper can improve the voltage distribution of the distribution network well.