新型换流变压器及其滤波系统的换相电抗的分析计算  

Analysis and Calculation of Commutated Reactance of Novel Converter Transformer and Its Filter System

作　　者：许加柱[1] 罗隆福[1] 李季[1] 张杰[1] 李勇[1] 刘福生[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电工技术学报》2007年第10期49-54,共6页Transactions of China Electrotechnical Society

基　　金：湖南省"十一五"重大科技专项资助项目(06GK1003-1)

摘　　要：换相电抗是高压直流输电系统中的一项重要技术参数。换流变压器的换相电抗计算常采用单相测量法。考虑到新型换流变压器及其滤波系统的接线方案较为特殊,了解其换相电抗与绕组之间的短路阻抗及阀侧滤波支路的基频阻抗之间的关系,对新型换流变压器的阻抗设计和阀侧无功补偿度的优化配置是十分必要的。为了有效解决换相电抗的对称性问题及阀侧滤波支路参数变化对其换相电抗的影响,本文提出了一种三相测量法,并采用单相及三相测量法对新型换流变压器在不接入和接入阀侧滤波器两种条件下的换相电抗进行计算。结果表明两种方法完全一致,并分析了阀侧滤波支路基频阻抗对系统换相电抗的影响。最后,通过对比理论计算值、仿真结果和实验结果,表明本文换相电抗的计算方法和计算结果是正确的。Commutated reactance is an important parameter in HVDC transmission system. Single-phase calculation method of commutated reactance is a traditional one. Taking the particularity of the connection scheme of novel converter transformer and its filter system into account, it＇s necessary to find out the relation between its commutated reactance and short-circuit impedances between windings and fundament frequency impedance of filter branch for impedance design of novel converter transformer and reactive power compensation degree at the valve side. For solving effectively the problems of commutated reactance symmetry and the influence of filter branch on commutated reactance, a three-phase calculation method is proposed. The single-phase and three-phase methods are both used to calculate the novel converter transformer＇s commutated reactance under the two conditions of switching on and switching off the filters at the valve side. The results indicate that the two methods are completely correspondent, and analyzing the fundamental impedance of filter branch how to influence the commutated reactance. In the last, through comparing the theoretic results, simulation ones and testing ones, it verifies that the above calculation methods and results are reliable.

关 键 词：换相电抗 新型换流变压器 阻抗设计 无功补偿度 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM42