基于换相电流时间面积的换相失败判别方法  

Current-time Area Method for the Identification of Commutation Failure

作　　者：李思思[1] 白仕雄 丁志林[2] 王渝红[1] 李兴源[1] 魏巍[1] 何鹏飞[1] 

机构地区：[1]四川大学电气信息学院,成都610065 [2]四川省电力公司超(特)高压运行检修公司,成都610041

出　　处：《电力系统及其自动化学报》2013年第2期98-102,共5页Proceedings of the CSU-EPSA

摘　　要：换相失败是高压直流输电逆变器最常见的故障之一。文中通过对换相过程的机理分析,用换相电流时间面积这一概念从能量的角度揭示换相过程的物理含义,提出一种可以判别直流系统是否发生换相失败的指标———换相电流时间面积,并给出相应的判据条件。直流控制方式、控制参数以及故障严重程度的不同,换相电流时间面积也不同。应用PSCAD/EMTDC电磁暂态仿真软件,在CIGRE高压直流输电系统标准模型中进行仿真,并与熄弧角判据进行对比验证,仿真结果证明了理论分析和判据的正确性。Commutation failure is one of the most frequent faults in HVDC （high voltage direct current） system. Based on the mechanism of commutation, the conception of commutation current-time area is proposed to reflect the energy conversion process. A novel index-commutation current-time area method is proposed to indentify commutation failure. Commutation current-time area is not a fixed constant due to the different DC control strategies, parameters and fault severity. This paper is based on GIGRE HVDC system simulation model, using PSCAD/EMTDC to verify the theoretic analysis and compare the results with extinction angle criterion. The simulation results show the accuracy of the analysis and criteria.

关 键 词：换相失败 换相电流时间面积 熄弧角 换相角 高压直流输电系统 交直流混联系统 

分 类 号：TM712[电气工程—电力系统及自动化]