Study On Voltage-frequency Control Strategy For Microgrid In Islanded Operation Mode

In recent years to build saving and sustainable society, the research in microgridbecomes essential. After the2008snow storm in southern china, it is necessary tospend on the research for the microgrid, ensuring the safety of power systems andeconomical loss of fauls. In particular the research on voltage-frequency controlstrategy for microgrid in intentional islanded operation mode shows great importance.In this case, distributed generation and microgrid are introduced, and theadvantages of the microgrid are analyzed. The theme of this dissertation is putforward, that is, the research on control strategies of the microgrid in intentionalislanded operation mode.The control strategies of microgrid include power control、voltage-frequencycontrol、synthetic control. They can meet the requirement of the rapidity of operation.However, as the microgrid is working in the mode of islanding operation disconnectedfrom the main power system, it will make the power system even worse and thecontrol objectives may not be achieved by means of the local control strategies. So weneed to research on the model and control strategies of islanded operation. The thesispresents some automatic control functions in the microgrid under the islandedcondition，including prevention、actual control and recovery. We mainly introduceclosed-loop control, then refer to the automatic control strategy. The results show thatthe approach is effective and can realize the stability of the system...