Research on Grid Control of Three-phase Optical Storage Microgrid System

Aiming at the stability problem of grid-connected operation of the power generation system composed of photovoltaic and energy storage, a grid-connected voltage control strategy with dispatchable capability of the three-phase photovoltaic grid-connected power generation system is proposed. The front-stage photovoltaic side uses the disturbance observation method for maximum power tracking (Maximum Power Point Tracking, MPPT), the energy storage unit uses a bidirectional DC/DC converter for charge and discharge control, and the back-stage grid-connected inverter uses dual-loop control. A simulation model of the system is built on the Matlab/Simulink simulation platform, which verifies that the control method can effectively maintain the DC bus voltage stability and reduce the grid-connected current distortion rate under load changes and photovoltaic power fluctuations.