A novel active power control strategy based on droop control method for parallel inverters

The conventional droop control method, which does not require communication lines, is an effective control scheme to dispatch power among inverters in the microgrid. However, this method has inherent tradeoffs: frequency vs. active power accuracy and amplitude regulation vs. reactive power sharing accuracy. To cope with this problem, this paper presents a novel active power control strategy to improve the active power sharing accuracy and eliminate the frequency deviation in steady state. Compared with existing methods, the proposed method do not need any communication line, since this method utilizes the system frequency as signals to coordinates parallel operations. The experimental results are presented to prove the validity of this approach.