A Wavelet-Based Droop Control of Reactive Power Sharing and Frequency Regulation in Islanded Microgrids

Droop control method is an effective technique utilized in control of active/reactive power in microgrids without any need to communication links. However, the accurate reactive power-sharing cannot be achieved by conventional droop control because of mismatched line impedance and non-inductive local loads in microgrids. To overcome the problem, an enhanced droop control is proposed in this paper. The proposed method helps to decrease cost and increase the reliability of the system without the use of any communication links. It is based on a wavelet transform technique to recognize and synchronize the distributed energy resources when the load changes in the microgrid. Fast transient response, accurate frequency regulation and proper reactive power sharing are achieved by the proposed method. The simulations are carried out in MATLAB/Simulink and the obtained results demonstrate the appropriate performance of this method.