基于同步电压源的微电网分层控制策略设计  

Synchronous Voltage Source Based Design of Hierarchical Control Strategy for Microgrid

作　　者：鲍薇[1] 胡学浩[1] 李光辉[1] 何国庆[1] 刘思言[2] 

机构地区：[1]中国电力科学研究院,北京市100192 [2]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电力系统自动化》2013年第23期20-26,共7页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA05A106;2011AA05A301)~~

摘　　要：提出了一种基于同步电压源的不同时间尺度的分层控制策略。在一次控制中,分析了传统同步电压源控制存在的无功功率均分问题,采取增大下垂系数法提高功率均分的精度,这种方法适用于带本地和公共负载的各种拓扑结构的微电网;在二次电压和频率控制中,详细给出了下垂曲线二次调整量的计算方法,提高了系统的电压和频率质量;此外,在二次控制中,还提出了基于同步电压源的无缝切换和联络线功率控制方法,在微电网并网同期过程中能够维持各微源的功率均分关系,在微电网并网运行时能实现微电网和主网之间的联络线功率控制,并使各微源按比例均分负荷和联络线功率。最后,利用PSCAD/EMTDC仿真验证了所提出的控制策略的合理性。A new hierarchical control strategy for the microgrid based on the synchronous voltage source converter on different time scales is proposed.In the primary control,the reactive power sharing problem of conventional synchronous voltage source converter control is analyzed.And the method of increasing the droop coefficient is adopted to improve the accuracy of power sharing.This method is suitable for the microgrid with various topologies involved in the local and public load.In the secondary voltage and frequency control,the calculating method of the droop curve adjustment in the secondary control is elaborated in detail,improving the voltage and frequency quality of the power system.In addition,the seamless transition control between interconnection and islanding mode and the tie-line power control between microgrid and main grid are proposed in the secondary control.And power sharing can be maintained in mode transition while the tie-line power can be controlled in the interconnection mode.Finally,the rationality of the proposed control strategy is verified by simulation in PSCAD/EMTDC software environment.

关 键 词：同步电压源 微电网(微网) 分层控制 功率均分 无缝切换 

分 类 号：TM76[电气工程—电力系统及自动化]