Unbalanced Voltage Compensating and Current Sharing Strategy of Parallel Converters in Islanded Microgrids

This paper proposes an unbalanced voltage compensating and current sharing control strategy for voltage source converters (VSC), which can improve the power quality and share the negative sequence currents accurately in islanded microgrid. To achieve the control targets, resonant controller and virtual impedance are implemented in VSC control loop. The control performance of compensation controller and virtual impedance are also analyzed in the paper. The simulation model with the parallel operation of two VSCs in the islanded microgrid is developed and the simulation result validates the effectiveness of proposed control strategy.