特高压换流变压器网侧绕组电流检测系统设计及谐波特性分析  

Design of Detection System and Harmonic Characteristic Analysis for the Grid Side Winding Current of UHVDC Converter Transformer

作　　者：赵涛[1] 刘乐康 孙建涛 梁宁川 张民 刘书铭 ZHAO Tao;LIU Lekang;SUN Jiantao;LIANG Ningchuan;ZHANG Min;LIU Shuming(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric Power University,Baoding 071003,China;China Electric Power Research Institute,Beijing 100192,China;State Grid Corporation of China,Beijing 100031,China;Electric Power Research Institute of State Grid Henan Electric Power Corporation,Zhengzhou 450052,China)

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,保定071003 [2]中国电力科学研究院有限公司,北京100192 [3]国家电网有限公司,北京100031 [4]国网河南省电力公司电力科学研究院,郑州450052

出　　处：《高电压技术》2021年第4期1443-1450,共8页High Voltage Engineering

基　　金：国家电网有限公司科技项目(5200–201955096A–0–0–00)。

摘　　要：为分析特高压换流变压器绕组电流谐波对变压器损耗、内部温升及振动噪声等问题造成的影响,基于现场换流变压器绕组电流信号的检测要求和换流站内谐波电流产生机理,研究了换流变网侧绕组谐波电流检测方案。将电流信号提取、信号同步采集、光纤传输、谐波群集频率算法等技术相结合,构建了一套换流变压器网侧绕组谐波电流检测系统。在双极平衡定功率稳态运行工况下,通过对某特高压换流站内换流变网侧绕组电流的现场检测及对其谐波特性的分析,验证了所提谐波检测系统的准确性。在此基础上,对直流输送功率上升过程中的换流变网侧绕组谐波电流进行了检测分析,结果表明,随着直流输送功率的增大,11、17、19、23、29、31、35、37、41、43、47、49次特征谐波畸变率有较明显的下降趋势,且总谐波畸变率也逐渐降低。Based on the on-site detection requirements of winding current and generation mechanism of the harmonic current in the converter station, this paper presents a system for detecting harmonic current in the grid side windings of the converter transformer to obtain the winding current harmonic and analyzes its influence on power loss, internal temperature rise and vibration noise of the transformer. The technologies of current signal extraction, signal synchronous acquisition, optical fiber transmission, and harmonic cluster frequency algorithm are combined in the winding harmonic current detection system. Under the steady-state operation condition of bipolar equilibrium constant power, the effectiveness of the detection system is verified by the results of on-site detection and the simulation analysis of the harmonic characteristics. Based on this, the harmonic current of the grid side winding is detected and analyzed during the process of dc transmission power rise. The results show that, with the increase of DC transmission power, the distortion rates of 11 th, 17 th, 19 th, 23 rd, 29 th, 31 st, 35 th, 37 th, 41 st, 43 rd, 47 th and 49 th harmonics have a significant decline trend, and the total harmonic distortion rate reduces gradually.

关 键 词：UHVDC 换流变压器 绕组电流 谐波 检测系统 

分 类 号：TM721.1[电气工程—电力系统及自动化]