交流系统等值电抗对新型直流输电系统运行参数的影响  

Impacts of the AC System Equivalent Reactance on Operation Parameters of a Novel DC Transmission System

作　　者：罗隆福[1] 尚荣艳[1] 李勇[1] 邓淑娟[1] 许加柱[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》2008年第6期96-102,108,共8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：简要介绍了直流输电系统换流站的拓扑结构以及动模试验方案,分别建立了未接入滤波器和接入滤波器时计算传统及新型直流输电系统运行参数的数学模型。在此基础上,分析了交流系统等值电抗对直流输电系统运行参数的影响。结果表明,在换流器换相过程中,交流系统等值电抗使换流变压器网侧及阀侧线电压均发生了畸变。未接入滤波器时,传统与新型直流输电系统电压畸变后的波形相似;接入滤波器后,传统与新型直流输电系统的网侧线电压波形的改善效果相同,但新型直流输电系统阀侧线电压波形的改善效果明显优于传统直流输电系统,且换相角大大减小。计算结果与实验结果十分吻合,验证了理论分析和数学模型的正确性。为进一步深入研究新型直流输电系统运行特性以及换相特性提供了理论依据。The topological structure of the DC transmission converter station and the dynamic simulation test are introduced briefly. And the mathematical models to calculate the operation parameters of the traditional/novel DC transmission with filter and without filter are built respectively. Then, the impacts of the equivalent reactance of AC system on the operation parameters of DC transmission system are analyzed. Results show that the AC system equivalent reactance results in distortion both in the net-side line voltage and in the valve-side line voltage of the converter transformer during the converter commutes. If they have no filter, the novel DC transmission system and the traditional one have a similar waveform. And if they have a filter, the improvement in the net-side line voltage is also same. However, the improvement in the valve-side line voltage of the novel system is much better than that of the traditional one. what＇s more, the commutation angle of the novel system is greatly reduced. The theoretical results are consistent with the test results, which verify the correctness of the theoretical analysis and the accuracy of the mathematical models. This research provides theoretical basis to further study on the operation and commutation characteristics of the novel DC transmission system.

关 键 词：新型换流变压器 直流输电 感应滤波技术 换相失败 

分 类 号：TM46[电气工程—电器] TM721.1