Grid Current Control of Microgrid with Cascaded Micro Source Inverters Based on Dynamic Phasors Model

In order to research grid connected operation performance of microgrid with cascaded micro source inverters, the dynamic phasors model of cascaded inverters link is established firstly. Then, the quasi-PR controller in two-phase stationary reference frame and PI controller in synchronization rotating reference frame are used respectively to control the grid current of system. And detailed comparation and analysis are made to the two control methods mentioned above, from the aspect of steady-state error, response speed and grid current quality. Finally, the quasi-PR controller in two-phase stationary reference frame is applied to control the grid current of the microgrid that each phase contains ten cascaded micro source inverters and simulated by MATLAB/Simulink. The simulation results show that the current of system has high power quality and fast response under different operating conditions.