Control Strategy And Protection Of Dual Storage Microgrid

With the rapid development of the society and economic, the need of energy increasemore. Electricity as one of the main forms of energy plays an important role in theeconomy and society. However, during the transmission of electrical energy, thetraditional power grid highlights the problems. Through the integration of distributedgeneration microgrid technology has attracted more and more attention. Academicmembers generally consider that traditional centralized power systems combine withmicrogrid system is an effective way to solve the power system stability. Microgrid cantake advantage of a variety of local distribute generations, renewable energy, improveenergy efficiency and reduce the grid construction costs. Microgrid has two operatingmodes: Grid-connected mode and islanding mode. During grid-connected operation, thevoltage and frequency of the microgrid is controlled by the large grid. On island mode,the voltage and frequency of intermittent microgrid distributed generation or even proneto fluctuations mutation, power quality is difficult to control. This problem is difficult tocontrol the frequency and the voltage of the island microgrid, this paper presents themicrogrid frequency and voltage control for dual energy storage system. Battery energystorage system control, control super capacitor energy storage system, and thecoordination and control of the proposed dual-energy storage control strategies, thetheoretical analysis and simulation.Firstly, study the background and current status of research on microgrid summarizes,analyze various types of microgrid structure. Elaborate theoretical research and practicalsignificance. For structural features dual storage microgrid, the mathematical model andsimulation model for each core part of the foundation for the study ofthe whole subject. Themodel includes all distributed generations and storage systems. Secondly, make the typicalstructure of dual storage microgrid control strategy for the study of microgrid. Invertermicrogrid control strategy is analyzed, focusing on the control strategy of energy storage systems. Theoretical analysis of a single storage control, and coordination control of dualenergy storage system, and the control strategy proposed a simulation test to prove therationality of the control strategy. Finally, the protection of the micro-grid is studied.Analyzes the impact of distributed power access to micro-grid protection, Study somecommon protection schemes，proposed protection strategies micro power grid model andislanding mode. Design protection scheme of microgrid and predict the developmentdirectionof microgrid in the end.