高压直流换流阀器件高频建模  

High-Frequency Modeling of Valve Components in High Voltage Direct Current Converter Stations

作　　者：孙海峰[1] 崔翔[1] 齐磊[1] 王琦[2] 黎小林[2] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]中国南方电网技术研究中心,广州510623

出　　处：《电工技术学报》2009年第11期142-148,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50707008;50777017);"十一五"国家科技支撑计划重大项目基金(2006BAA02A20)资助项目

摘　　要：高压直流(HVDC)换流站电磁干扰主要由阀体内的晶闸管在周期性的导通和关断过程中产生,该干扰中的高频分量通过辐射和传导两种形式会对换流站内的通信设备、计算机和载波系统操作等产生影响。所以,建立换流阀高频电路模型对该干扰进行预测,研究其时频特性是进行干扰机理分析的前提条件。本文对HVDC阀体内的晶闸管、阻容吸收电路和饱和电抗器的阻抗频率特性进行了测量(频率范围:100kHz～50MHz),在此基础上,通过矢量匹配方法对测量所得的离散点进行有理函数逼近,基于阻抗综合理论建立了阀体主要器件的高频等效电路。该电路能够直接应用于EMTP和PSCAD进行仿真,可为换流站内其他设备的抗干扰度以及阀厅屏蔽设计提供可靠依据。仿真结果和测量结果的比较,验证了本文建模方法的正确性。Electromagnetic interference （EMI） is generated by the periodic switching of the valves in HVDC converter station. This EMI can cause high frequency radiative interference and conducted interference to the adjacent communication, computer equipment and carrier system operations. So a high-frequency model of converter valves is necessary to predict the characteristic of the EMI source. The modeling method is based on the impedance measurement of thyristor, snubber circuits and saturable reactor and the frequency range is from 100kHz to 50MHz. Vector fitting （VF） is used to approximate the rational functions and impedance synthesis theory is applied to provide equivalent circuits suitable to EMTP and PSCAD. These models can be used to analyze the characteristic of EMI sources in converter stations and have a guide on immunity and screening design. For validity, a comparison between the simulated and measured is conducted.

关 键 词：换流阀 矢量匹配 阻抗综合 高频模型 

分 类 号：TM133[电气工程—电工理论与新技术]