Research And Application Of AC Microgrid Energy Management System And Coordination Management Strategy

The increasingly serious of international energy shortage crisis and environmental degradation by the industrial pollution is providing development of the distributed generation and microgrid technology on the basic of renewable energy.In this context,the micro grid energy management system with coordination management strategies offer a solution for resolving the problem of microgrid coordination operation.The distributed generation technology can make full use of renewable energy and can largely alleviate the pollution of the environment by traditional fossil fuel.Large scale distributed generation into the power system will result in some negative influences such as stability and reliability.The microgrid technology is put forward to coordinate contradiction between the large power grid and distributed generation,take full advantages of all kinds of distributed generation and reduce the negative impact on the large power grid.But with the development of microgrid technology,more kinds of distributed generation access into the system,more complex structure of micro grid,and more uncertain of control strategy,it is need to study the microgrid energy management system and its coordination management strategy to ensure the stable operation of microgrid.The main contents are as follows:Firstly,the domestic and foreign research tendency of distributed generation technology and microgrid technology is introduced,the characteristics of microgrid energy management system is analyzed and the main functions of microgrid energy management system is summarized.To develop the research ideas of the whole study,the research goals,methods and procedures of microgrid energy management technology are analyzed.Secondly,aiming at the local intelligent control layer for the micro grid system,the working principle and output characteristic of the distributed generation and the hybrid energy storage system are introduced.The described control strategy for distributed generation including droop control,constant power control and constant voltage constant frequency control.Additionally,the control strategy for the multiple inverters units of microgrid system is studied including peer-to-peer control and master-slave control.Then,a microgrid energy management system including power distribution system and monitoring system for a microgrid is proposed.The microgrid energy management system provides online set monitoring points for each generator and load signals for consumers based on two control logical levels:expert coordination control layer and local intelligent control layer.The system operates stably and maintains a good working state in the laboratory.Finally,on the basis of the above research,the application of hierarchical control theory and multi-agent control theory in MGEMS are described.A energy coordination management strategy based on hierarchical control theory is proposed,taking full account of the energy management objectives under different operation conditions and the charge and discharge characteristics of energy storage system.The installation and debugging tasks of MGEMS is accomplished in the existent system,which proves the validity and practicability of the energy management strategy.