Micro-grid Droop Control Strategy Optimization and Simulation

In order to reduce the fluctuation of the frequency and voltage and improve the electric power quality of the micro-grid, the micro-grid control strategy is optimized which based on the droop control strategy. The frequency correction segment which the PID parameters can be adjusted is added to the P-f control section to improve the frequency stability of the micro-grid. At the same time, the fuzzy self-adaption PID controller is added to the Q-U control section to reduce the voltage fluctuation. The phase synchronization and voltage amplitude adjustment (PSVAA) module is designed to achieve the smooth and fast transition between grid-connected mode and islanded mode. Finally, the above optimizations and designs are validated on the simulation models that built in the MATLAB/SIMULINK. The simulation results indicate that the proposed control strategy can achieve the stable operation of the micro-grid.