基于配网重构的交直流混联配电网可靠性分析  

Reliability Analysis of AC/DC Hybrid Distribution Network Based on Network Reconfiguration

作　　者：程林[1] 王旭[1] 黄俊辉 李琥 常垚 

机构地区：[1]清华大学电机工程与应用电子技术系,北京市100084 [2]国网江苏省电力公司经济技术研究院,南京市210009

出　　处：《电力建设》2016年第5期2-9,共8页Electric Power Construction

基　　金：国家高技术研究发展计划项目(863计划)(2015AA050102);国家自然科学基金项目(51177078)~~

摘　　要：传统10 k V等级供电区域为开环运行,并且区域之间联络开关都处于冷备用状态,一旦发生变压器故障,在联络开关闭合前负荷供电中断。同时变电站的主变设备设计容量大,主变压器平均负载率较低。一种好的解决方法是在传统10 k V交流配网中加入多端柔性直流互联装置建立交直流混联配电网。根据交直流混联配电网的特点,提出了一种适合于交直流混联配电网的可靠性评估方法,在保证系统可靠性的基础上,研究是否可以减小变压器容量冗余。建立了考虑备用元件的多端柔性直流互联系统的可靠性模型,采用支路交换法在变压器故障时进行配电网重构为负荷恢复供电。通过对加入多端柔性直流互联装置的10 k V配电网算例进行可靠性评估,结果证明了多端柔性直流互联装置接入配电网后,可以提高系统可靠性,同时根据系统配网重构的结果证明系统主变压器的设计容量可以减小。Traditional 10 k V distribution network runs in the open-loop mode and the contact switch between regions is in cold standby state. If a transformer fault occurs,before the contact switch closes,the load is out of power. M eanwhile,the main transformer in substation is designed with large capacity,and the average load rate of the main transformer is low. It＇s a good solution to establish AC/DC hybrid distribution network by adding the multi-terminal flexible DC interconnection into the traditional 10 k V AC distribution network. According to the characteristics of AC/DC hybrid distribution network,this paper proposes a newreliability evaluation method for AC/DC hybrid distribution network,in order to explore whether the transformer capacity redundancy can be reduced with keeping the reliability of the system. We construct the reliability model of multi-terminal flexible DC interconnection with considering the spare components,and adopt network reconfiguration to restore power to load with using branch exchange method during transformer fault. According to the reliability evaluation of a 10 k V distribution network with multi-terminal flexible DC interconnection, the results prove that the reliability of distribution network increases after adding the multi-terminal flexible DC interconnection. M eanwhile,the results of the network reconfiguration prove that the designed capacity of the main transformer can decrease.

关 键 词：交直流混联配电网 配网重构 可靠性 平均负载率 

分 类 号：TM732[电气工程—电力系统及自动化]