考虑750kV系统适用性的变压器中性点电抗优化配置方法  

Optimization of reactance confguration of transformer neutral point considering the applicability of 750 kV system

作　　者：何龙 杨振 巴特 朱咏明 吴伟丽 刘勇 HE Long;YANG Zhen;BA Te;ZHU Yongming;WU Weili;LIU Yong(Changji Power Supply Company of State Grid Xinjiang Electric Power Co.Ltd.,Changji 831199,China;Institute of electrical and control engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Anhui Zhengguang Television Power Technology Co.,Ltd.,Hefei 230088,China)

机构地区：[1]国网新疆电力有限公司昌吉供电公司,新疆昌吉831199 [2]西安科技大学电气与控制工程学院,陕西西安710054 [3]安徽正广电电力技术有限公司,安徽合肥230088

出　　处：《电气应用》2020年第10期82-88,98,共8页Electrotechnical Application

基　　金：国家电网公司科技项目(SGHEHD00JXJS1900653)电容器组开断过电压抑制方法研究。

摘　　要：变压器中性点运行方式对抑制系统短路电流和过电压水平具有十分重要的影响,750 kV变电站具有较多的出线,因此在中性点加装小电抗将具有更高的短路电流限制效率。为此,提出了考虑750 kV系统实用性的中性点小电抗优化配置方法:构建了中性点小电抗与短路电流关联模型,并以短路电流和小电抗为目标函数,以短路时中性点过电压为约束搭建了优化模型,并利用多目标优化求解工具NSGA-III进行优化迭代,得到了小电抗最优配置方案,利用15节点750 kV系统加以验证,说明了优化方法的可行性和适用性。研究结果可为工程上限制短路电流提供新思路。The operation mode of transformer neutral point has a very important infuence on the short-circuit level and over-voltage of the system. There are more outgoing lines in 750 kV substation, so adding a small reactance at the neutral point will have a higher short-circuit current limiting effciency. In this paper, a method of optimizing the confguration of neutral small reactance considering the practicability of 750 kV system is proposed: the correlation model between neutral small reactance and short-circuit current is constructed, and the short-circuit current and small reactance are taken as the objective functions, and the over-voltage of neutral point is taken as the constraint to build the optimization model. The multi-objective optimization solution tool NSGA-III is used to carry out the optimization iteration, and the optimal confguration of small reactance is obtained. The feasibility and applicability of the optimization method are demonstrated by using a 15 node 750 kV system. The research results can provide a new way to limit the short-circuit current in engineering.

关 键 词：中性点运行方式 短路电流 过电压 NSGA-III 优化 

分 类 号：TM41[电气工程—电器]