An improved droop control strategy in the islanding operation

For maintaining the stability of voltage and frequency, the droop control is often adopted when micro-grid is in islanding operational mode. Although this method can control the fluctuation of voltage and frequency, when the loads change, its implementation effect is weak In order to solve the mentioned problem, an improved dynamic self-adjusting droop control strategy is proposed: on the basis of the traditional one, PI control of voltage and frequency is introduced to control flow. The principle and implementation steps of this method are analyzed. Finally, the operating characteristics of overloading connection, overloading cutting-off and loads disturbance are simulated and discussed based on an islanding mode built in Matlab/Simulink. The results show the proposed method can control the voltage and frequency more effectively and faster than traditional droop control, and can enhance the stability of micro-grid in islanding operational mode.