Control method and control device for energy storage inverter off-grid parallel system

摘要

The invention discloses an energy storage inverter off-grid parallel system control method, and the method comprises: controlling a main energy storage inverter to operate according to a given operating current value; detecting direct current voltage values of the main energy storage inverter and an auxiliary energy storage inverter; according to the operating current value of the main energy storage inverter and a direct current voltage difference value between the main energy storage inverter and the auxiliary energy storage inverter, determining an operating current value of the auxiliary energy storage inverter; and controlling the auxiliary energy storage inverter to operate according to a given operating current value. Based on the control method disclosed by the invention, along with each storage battery discharging process, the voltage of each storage battery in the energy storage inverter off-grid parallel system is gradually close to each other, so that common mode voltage between energy storage inverters is decreased, and common mode circulation between the energy storage inverters is decreased, when the voltage of each storage battery is the same, the common mode circulation between the energy storage inverters can be eliminated, and the stability of the system can be improved. The invention also discloses an energy storage inverter off-grid parallel system control device.