Third-order sliding-mode-based droop control for microgrid-connected parallel inverters with LC filters

A novel droop control method based on slide mode control for microgrids is proposed to enhance the power sharing performance and suppress disturbances from power components' parameters deviation and loads. The output voltage is controlled to be close to the reference voltage by a sliding mode control loop, which can maintain a good power sharing effect under the variation of system parameters or power loads' sudden fluctuation, i.e. being robust. The controller has high reliability in islanded small and medium-sized microgrids, for it merely requires voltage and current as input, and no additional communication for the proposed controller are required. Finally, by using MATLAB / Simulink, a simulation control model of two parallelled inverters is established to verify the feasibility and effectiveness of the presented controller in this paper.