A Novel Controller for Parallel Operation of Inverters Based on Active Disturbance Rejection Control Technique

In this paper, a novel high-precision control strategy for parallel operation of three-phase inverters is proposed. In this system, the instantaneous values of active power and current for each module are obtained first by a algorithm based on instantaneous values of output voltage and output current which are detected from each inverter. Then, adjust the output voltage phase and amplitude according to the difference of output active power and output reactive power between each inverter to achieve output current sharing. Moreover, instead of the conventional PI controller, Active Disturbance Rejection Controller is applied in the system in order to improve the control precision. Simulation and experiment result show effectiveness and advantages of the proposed parallel inverters control system.