分布式电源对380V低压配电网熔断器保护的影响研究  

Analysis of the Impact of DG on Fuse Protector of 380V Low-Voltage Distribution Network

作　　者：王文焕[1] 杨国生[1] 王德林[2] 周泽昕[1] 刘宇[2] 李伟[1] 张志[2] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]国家电力调度通信中心,北京市西城区100031

出　　处：《电网技术》2015年第7期2029-2033,共5页Power System Technology

基　　金：国家电网公司科技项目(JB71-15-042)

摘　　要：分布式电源(distributed generation,DG)的接入改变了380V低压配电网的拓扑结构,将影响380 V低压熔断器的的可靠性。为此,在PSCAD/EMTDC平台上建立系统数字仿真模型,研究了逆变器型DG接入、旋转电机型DG及逆变器和旋转电机型DG混合接入3种接入方式下的380 V低压配电网故障特性。研究了3种方式下,DG接入容量和接入位置对380 V低压配电网的障特性的影响,并根据系统故障特性和熔断器熔断特性,分析DG接入对380 V低压配电网熔断器保护动作特性的影响。结果表明,DG接入会引起熔断器拒动或误动,危及低压配电网的供电可靠性。最后提出将DG的控制策略和熔丝的反时限特性相配合的措施,保证在发生反向故障时能够有选择性地切除故障。Integration of distributed generation（DG） changes the structure of 380 V LV distribution network, affecting the reliability of fuse protector. With PSCAD/ EMTDC distribution system is simulated, and the failure characteristics of 380 V LV distribution network are analyzed for integration of inverter type, rotary motor type and hybrid DG. The fault characteristics of 380 V LV distribution network for different capacities and locations in the three integration types are studied. According to the failure characteristics of the system and fusing characteristics of fuse protector, the impact of DG on fuse protector of 380 V LV distribution network is analyzed, 380 V LV distribution network protection strategies＇ optimization is proposed. The simulation results show that integration of DG will cause operation rejection or misoperation of fuse protector, endangers the reliability of LV distribution network. Finally, it is proposed that combining DG control strategies with inverse time characteristics of fuse protector will ensure that reverse fault is eliminated selectively.

关 键 词：分布式电源 熔断器保护 380 V低压配电网 逆变器 旋转电机 

分 类 号：TM734[电气工程—电力系统及自动化]