串联和并联结构的多微网系统分层主从协调控制方法分析-analysis of hierarchical master-slave coordinated control method for multi-microgrid systems with series and parallel structures.docx

重庆大学硕士学位重庆大学硕士学位论文英文摘要 PAGE PAGE VIABSTRACTThis thesis was supported by independent research project of State Key Laboratory of Power Transmission Equipment System Security and New Technology (2007DA1051270 9208) and National Natural Science Foundation of China .The microgrid is a individually controllable system, which contains distributed generation (DG), distributed energy storage (DS) and the corresponding load. Microgrid has advantages of autonomous operation, fault recovery, mutually reinforcing, optimize management and coordination. The microgrid is divided into multiple sub-microgrids to realize large-scale distributed generation accessing, enhance reliability and ensure power quality of microgrid. So the coordination control among DGs, DSs, local load ,switch of microgrid and multi-microgrid system should be established, ensure that the microgrid can meet the power requirements of the local user under different operating conditions.This paper designs two-level hierarchical control scheme of multi-microgrid system with series and parallel structure, research micro source controller(MGCC)’s function of power control, state management and synchronization control. Analysis operation states and trigger events of the multi-microgrid system, simplify and classified operation states, a scheme of operation state transition is established under its current operation state and trigger event. According to the characteristics of multi-micro-grid system tie-line power control and synchronization control,paper design coordination strategy of MGCC. The main contents are as follows:The paper analysis the characteristics of multi-microgrid system with series and parallel structure, designs two-level hierarchical control scheme of multi-microgrid system,which contains master-slave MGCC. The relationship of sub-microgrids with series structure is upstream and downstream. When upstream sub-microgrid is islanding, the downstream is islanding. The relationship o