Robust hybrid control of parallel inverters for accurate power-sharing in microgrid

International audienceThe communication link, low reliability, inaccurate power sharing and voltage and frequency deviations are some challenges in control methods of parallel inverters in high voltage microgrids. This paper proposes a hybrid control method using the impedance-power droop and conventional droop methods. In the proposed hybrid method, the impedance-power droop method works as the main strategy in steady state and the conventional droop method is employed as auxiliary strategy during startup and transient states. The notable advantages of the proposed method are low virtual impedances, no need for recognition of system parameters, simple and low calculations. Moreover, the voltage deviation in the steady state is minimized and the frequency deviation is completely eliminated. Finally, the performance of the control method is validated by simulation