Study on double-loop control technique for micro-grid inverters

A three-phase full-bridge voltage inverter based on voltage-current double-loop control strategy is proposed. The voltage-current double-loop controller is set up through analyzing the mathematical model of the inverter in the two-phase synchronous rotating coordinate system. In order to improve the dynamic response character and interference rejection ability, outer voltage loop includes the feedforward of load current and output filter capacitance current decouple component, inner current loop includes the feedforward of output filter inductance voltage decouple component. The simulation results verified that the control system has good dynamic performance and steady-state performance.