764 / 2019-04-28 12:40:59

Study on control strategies of off-grid island Microgrid

off-grid；island microgrid；double-layer DC bus; Voltage Level; control strategies

Compared with single-layer DC bus microgrid, double-layer DC bus microgrid improves the ability of supplying power to loads with different voltage levels. Based on the output characteristics of different distributed generations and the output power of DC bus of different voltage layers, this paper puts forward the operation modes of Wind power generation, Wind power storage and power generation, Wind power generation, Photovoltaic power generation, Wind-solar-diesel Power Generation as well as the high voltage layer supplying power to the low voltage layer.Through the implementation of maximum power tracking control, voltage stabilizer control, start-stop control and the Power electronics transformation, we can achieve the active switching between different modes of operation.