Research of Mode and Topology of Hybrid Renewable Energy System in DC Bus Microgrid

As an essential part of energy internet, micro grids with renewable sources arise rapidly in recent decades to meet the power requirements and solve environmental problems. In this paper, a research of virtual synchronous machine control strategy of hybrid renewable energy in DC micro grid is proposed. System configuration and control methods of key devices are given. Aiming at stabilizing the bus voltage in every possible situation, a virtual speed regulator and a virtual excitation regulator are also designed to make sure that the grid control center can dispatch micro grid using the same way as dispatching synchronous machines. Finally, a DC micro grid model is built in MATLAB platform and operation results shown the high performance of the designed control strategy.