Method for adjusting voltage and frequency through micro power grid self-adaption droop control based on PI control

The invention relates to a method for adjusting a voltage and a frequency through micro power grid self-adaption droop control based on PI control. When a traditional droop control is used and a micro power grid operates in an isolated island operation manner, no matter a load increases or reduces, the frequency or the voltage deviates a rated value. Aiming at the existing problem of traditional droop control, a droop coefficient is improved through a PI controller. Firstly, a difference between output power after a change and a given value is made, a difference between the former difference after passing through the PI controller and a traditional droop control coefficient then, and the improved droop coefficient is obtained. Under the action of the improved droop control coefficient, the object of frequency and voltage adjustments can be achieved, that is to say, the voltage and the frequency of a system is maintained within reasonable scopes.