基于双端电气量的输电线路故障测距算法  

Fault Location Algorithm of Transmission Line Based on Two-terminal Electrical Power Quantities

作　　者：洪亚[1] 谭阳红[1] 张海霞[1] 宋建立[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电力系统及其自动化学报》2016年第11期20-24,共5页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61102039;51107034);湖南省自然科学基金资助项目(14JJ7029);中央高校基金资助项目

摘　　要：为了解决单端故障测距受故障点的过渡电阻和对端系统阻抗的影响,提出了基于双端电气量的比相式故障测距方法。首先推导出了分布参数模型输电线路的电流分布系数公式,分析了单端比相式测距算法误差产生的原因;然后求出输电线路两端系统的非同步角;再通过将线路一端的电压电流和线路另一端的电流进行对称分量变换与反变换,推算出沿线各点的故障支路的电压和电流,利用故障支路的电压和电流相位差最小值的特征进行定位;最后采用分布参数线路模型建立超高压输电系统仿真模型在Matlab/Simlink中进行全面系统的仿真验证。结果表明所提的故障测距算法不受过渡电阻、系统阻抗、故障类型等因素的影响。To overcome the influences of transition resisance and far-end equivalent impedance on the single-terminal fault location algorithm, this paper introduces a phase-comparison algorithm for two-terminal fault location based on two-terminal electrical power quantities. It first deduces the current distribution coefficient formula of transmission line using distribution parameter model, then analyzes the error due to phase-comparison algorithm for single-terminal fault location. It also calculates the non-synchronous angle of transmission line at the two ends. The voltage and current of fault branches along the line are calculated through comparing the voltage and current at one end with the current at the other end using phase-mode transformation and inverse transformation. The minimum value of the characteristic phase shift between the voltage and current of fault branch is thus used in the location. In this paper, distributed parameter line model is used to established ultra-high voltage power transmission system, then simulation is done in Matlab/Simu- link. It is proved that the proposed fault location algorithm is not affected by transition resistance, system impedance or fault type, etc.

关 键 词：双端电气量 比相式 分布参数模型 故障测距 电流分布系数 

分 类 号：TM711[电气工程—电力系统及自动化]