考虑交直流谐波交互影响的高压直流开关函数建模  

Switching Function Modeling of HVDC Converter Taking Into Account AC/DC Harmonic Interaction

作　　者：丁天皓 汪娟娟[1] 叶运铭 陈威 傅闯 DING Tianhao;WANG Juanjuan;YE Yunming;CHEN Wei;FU Chuang(School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,Guangdong Province,China;State Key Laboratory of HVDC(Electric Power Research Institute of China Southern Power Grid),Guangzhou 510663,Guangdong Province,China)

机构地区：[1]华南理工大学电力学院,广东省广州市510641 [2]直流输电技术国家重点实验室(南方电网科学研究院有限责任公司),广东省广州市510663

出　　处：《电网技术》2021年第7期2879-2887,共9页Power System Technology

摘　　要：开关函数法通过构造换流器的数学模型来分析换流器两侧电气量的响应特性,传统的开关函数模型受限于换流阀在交流故障时不对称导通特性的影响,不能准确地反映换流器的谐波特性。通过分析交流故障情况下换相电压相位以及触发角等关键电气量的变化,着重考虑了换流器两侧谐波对于换相时间的影响,给出计及交直流侧谐波交互影响的换相角计算方法,以此为基础建立了适用于换流器不对称运行条件的开关函数模型,在PSCAD/EMTDC中采用CIGRE高压直流标准测试模型和±500kV牛丛直流(同塔双回)工程模型进行仿真校验,验证了该方法的有效性和准确性。A switching function method analyzes the response of the electrical quantities on both sides of the converter by constructing a mathematical model of the converter.The traditional switching function model,restricted by the impact of the asymmetric conduction characteristics of the converter valve during the AC faults,cannot accurately reflect the harmonic features of the converter.By analyzing the changes of the key electrical quantities such as the commutation voltage phase and the firing angle under the AC fault conditions,the impact of the harmonics on both sides of the converter on the commutation time is emphatically considered,and a conversion that takes into account the interaction of harmonics on the AC and DC sides is given.Based on the method,a switching function model suitable for the asymmetric operating conditions of the converter is established.The CIGRE HVDC standard test model and the±500 k V Niu Cong DC(double-circuit on the same tower)engineering model are used to verify the effectiveness and accuracy of the method.

关 键 词：开关函数 不对称故障 谐波分析 换相角 

分 类 号：TM721[电气工程—电力系统及自动化]