低压微网综合控制策略设计  

Study on Control Strategies of a Low Voltage Microgrid

作　　者：牟晓春[1] 毕大强[2] 任先文[1] 

机构地区：[1]东北电力大学电气工程学院,吉林省吉林市132012 [2]电力系统国家重点实验室,清华大学电机系,北京市100084

出　　处：《电力系统自动化》2010年第19期91-96,共6页Automation of Electric Power Systems

摘　　要：考虑到微源和负荷的不同类型以及具有分散性的特点,根据微网的2种典型运行模式,采用不同的控制策略对低压微网进行综合控制。针对低压下线路参数成阻性的特点,在微网孤岛模式下对传统下垂特性进行重新设计,同时提出同步并网控制器的设计方法,有效降低了微源再并网时对低压微网的冲击,提高了系统的稳定性和可靠性。通过对低压微网运行模式的切换、孤岛模式下切/增负荷、孤岛模式下某一微源退出及重联到微网这3种情况下的运行特性进行仿真分析,证明了低压微网系统下所设计控制策略的可行性。Considering the micro source and load with different types and its dispersion,the low voltage microgrid can be controlled comprehensively by different control strategies based on the two typical microgrid operating modes. Given that the line parameters of a low voltage grid is resistive,the traditional droop characteristic feature is redesigned under islanding mode of the microgrid system. Meanwhile,a grid synchronization controller is proposed to effectively reduce the impact on low voltage grid systems by reconnecting the micro source to the grid. The controller can also improve the stability and reliability of the system. Through three detailed case studies,being （i） switching microgrid operation modes,（ii）cutting or increasing load in islanding mode,and （iii） cutting and reconnecting one micro source in islanding mode,the feasibility of the proposed control strategy for the low voltage system is validated.

关 键 词：低压微网 PQ控制 V/F控制 微源 联网模式 孤岛模式 

分 类 号：TM76[电气工程—电力系统及自动化]