Abstract
The microgrid multi-parallel inverters system with droop control strategy will produce microgrid frequency static error due to the reference power mismatch. In order to eliminate the frequency static error caused by droop control as well as enhance the stability of multi droop inverters system, a secondary frequency regulation and stabilization method for multi-parallel droop inverters system based on island operation of the frequency static error integral lead compensator is proposed. The proposed method includes no communication link among inverters. Through the state space modeling of the multi-parallel drooping inverter microgrid system based on the component connection method (CCM), the state space model of multi parallel inverters is established. Parameter design and analysis are carried out accordingly. The state space model of the load is also established with transfer function-state space mapping method as a comparison. The method proposed in this paper can effectively enhance the small signal stability of the system while realizing the frequency error-free operation of multiple parallel droop inverters. To verify the method proposed in this paper, MATLAB/Simulink simulation is conducted to compare the proposed method with the method based on communication consensus algorithm and proves the effectiveness of the proposed method and at the same time.
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