Study on the precise distribution of reactive power in parallel inverters

To address the limitations of traditional Droop Control (DC) methods stemming from differences in transmission line impedance within parallel inverter systems, which often result in inaccurate reactive power distribution, we propose an enhanced DC strategy incorporating adaptive virtual impedance. Firstly, the mathematical model of inverter parallel system is established to analyses the reason why the reactive power of traditional DC cannot be equally divided; Secondly, adaptive virtual impedance is integrated into the control loop to streamline the complex decoupling control algorithm. The value of the virtual impedance is adjusted based on the feedback of active power, thereby enhancing the accuracy of power allocation and achieving equitable power distribution. Finally, a simulation model of the inverter parallel system is constructed using MATLAB/Simulink. The simulation results validate the effectiveness of the proposed method.