Research and simulation on inverter's control strategy in microgrid

ZHANG Chun， PAN Zai-ping
（College of Electrical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： Aiming at solving the problems of the fluctuations of voltage magnitude and frequency caused by the instable sources such as wind power and photovoltaic power when the microgrid is in islanding mode，a power compensation was investigated on the basis of using droop characteristic inversely to control the wireless inverter sources in parallel and all the distributed generations adjust the microgrid's voltage and frequency together.After the analysis of the relations between the output power and voltage，the formula of compensation power was established according to the differences of output voltage and frequency. A method was presented to change the regulable sources with a plus of power compensation and the regulable source was also operated in droop control as voltage source inverter. The method was evaluated by simulation on Matlab/Simulink，the fluctuation was tested. The results indicate that the control strategy has a significant effect on holding the voltage magnitude and frequency.
Key words： microgrid； inverter； droop control； power compensation； simulation