Abstract:Traditional droop control has become the most commonly used method for power control of distributed photovoltaic in distribution networks due to the lack of inter station communication. However, due to the differences in line impedance and the influence of complex load conditions, it cannot accurately control the reactive power output of each station. To address this issue, a reactive power adaptive control method of distributed photovoltaic based on virtual impedance is proposed for the distribution network. This method calculates the virtual power source based on the reactive power error and voltage drop difference of feeder impedance for each system. By applying virtual impedance to adaptive voltage compensation for distributed photovoltaic systems with different feeder impedances, accurate reactive power allocation between different distributed photovoltaic systems is achieved. The simulation takes a distribution network connected to three distributed photovoltaic systems as an example to compare the reactive power and voltage of each node under different power flow conditions, verifying the effectiveness of this method in reactive power balance distribution and voltage balance.