China International Youth Conference on Electrical Engineering (CIYCEE 2020)

The droop control strategy is widely used in parallel inverter systems. However, when the line impedance of each inverter is not matched, it will result in the reactive power sharing error. At the same time, due to the droop characteristics, the output voltage accuracy will be reduced. Aiming at the reactive power sharing error and voltage control accuracy in droop control, an improved droop control scheme is proposed. First, the principle of droop control is introduced, and the power sharing model is established. Secondly, a multi-dimensional adaptive droop control strategy is proposed to achieve better reactive power sharing performance. Then, the frequency and voltage compensation control is added to improve the accuracy of PCC voltage. Finally, a simulation model of the parallel inverter system is built to illustrate the effectiveness of the proposed scheme.

Droop control;Parallel;Reactive power