量测误差对高压线路零序参数辨识的影响机理分析  

Influence Mechanism of Measurement Error on High Voltage Transmission Line Zerosequence Parameter Identification

作　　者：唐景星 赵艳军 陈晓科 张跃 黄梓华[2] 毕天姝[2] TANG Jingxing ZHAO Yanjun CHEN Xiaoke ZHANG Yue HUANG Zihua BI Tianshu(Electric Power Research Institute, Guangdong Power Grid Corporation, Guangzhou 510080, China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广州510080 [2]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《电力系统及其自动化学报》2017年第7期125-130,150,共7页Proceedings of the CSU-EPSA

摘　　要：输电线路的零序参数是电力系统分析计算、保护整定的重要参数。随着PMU的广泛应用,采用PMU量测数据在线辨识成为输电线路零序参数获取的新方法。然而,现场PMU量测数据往往存在误差,影响了零序参数计算结果的精度。该文在输电线路π模型的基础上,分析了三相电压、电流相量量测误差对输电线零序参数辨识的影响机理。首先,通过数学推导,揭示了三相量测误差对零序分量的影响;其次,采用小扰动分析方法,研究了零序电压与零序电流的幅值、相角影响零序参数计算结果精度的机理;最后,通过仿真验证了所提理论的正确性。The zero-sequence parameters of transmission line are important parameters of power system analysis and protection setting. With the wide application of phasor measurement unit （PMU）, there is a new way to online identify the zero-sequence parameters of transmission line using PMU measurement data. However, there always exist errors in the in situ PMU measurement data, which affect the precision of calculation result of zero-sequence parameters. Based on the π model of transmission line, the influence mechanism of three-phase voltage and current phasor measurement error on the identification of zero-sequence parameters of transmission line is analyzed. Firstly, by mathematical derivation, the influence of three-phase measurement error on zero-sequence component is analyzed;secondly, the influence mecha- nism of the amplitude and angle of zero-sequence voltage and current on the precision of parameter identification is stud- ied by using small perturbation analysis method;finally, the proposed theory is verified through simulation.

关 键 词：输电线路 零序参数 PMU量测误差 小扰动分析 

分 类 号：TM726.1[电气工程—电力系统及自动化]