Control Strategies of a Wind / Photovoltaic / Storage Micro-Grid for Load Shifting Schedule of the Main Grid

Scheduling and control strategies of a wind / photovoltaic / storage micro-grid are studied to achieve the goals of the maximum use of renewable energy sources and load shifting of the main grid. The state space of the wind / photovoltaic / storage micro-grid is divided into 6 sub-state-spaces, according to its operation modes of connection with the main grid in conditions of peak/flat/valley periods and islanding with the balance between generation and load. Furthermore, the transfer premises between each state are analyzed. Based on the scheduling and control strategies for each state made through the studies above, the ultimate control program of charge / discharge power of the energy storage unit is obtained. Taking the demonstration project of wind / photovoltaic / storage micro-grid of an island in Guangxi as an example, simulation of operational control in representative days is conducted to verify the correctness and effectiveness of the proposed control strategies of load shifting schedule.