Transient analysis and control for microgrid stability controller

This work develops a microgrid stability controller to support microgrid switching its operation mode and provide DG units in the microgrid with the additional functionality of working in island mode without changing their control strategies. When microgrid works in grid connected mode, microgrid stability controller compensate power variation and reduces power fluctuation. When the main grid is not available, microgrid operates in island mode, microgrid stability controller provide output voltage and frequency reference for DG units. Its operation is analyzed by studying its control strategies, islanding detection techniques and black box arc model of circuit breaker at the Point of Common Coupling (PCC). Furthermore this paper analyzes its transient characteristics based on the dynamic performance of the microgrid during a fault in distribution network. Simulation and experimental results validates the feasibility of the microgrid stability controller.