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Improving power sharing between parallel voltage source inverters using enhanced droop controller

A new control method to improve in transient response of parallel inverters in islanded Microgrids is presented in this paper. The conventional droop is a good choice for controlling VSIs in microgrid disconnected from main grid. But this method has some drawback such as inappropriate transient response. The proposed scheme, based on the droop control method, uses current feedback signal that passed from a controller and is subtracted from no load frequency. This method is applied to obtain good active power sharing and decreasing circulating current in transient. In this work, a great improvement in transient response is achieved by introducing this new scheme. Simulation results that achieved by MATLAB, verify the improvements in the proposed method.