电力系统保护与控制Issue(12)：61-66,6.
风电场送出线等传变距离保护
Equal transfer process-based distance protection for wind farm outgoing transmission line
摘要
Abstract
The fault features of outgoing transmission line in DFIG-based wind plant with the capacity of low-voltage ride-through (LVRT) are analyzed. The main frequency inconsistency between voltage and current of wind farm outgoing transmission line leads a serious impact on the action performance of traditional distance protection element based on power frequency voltage and current phasor. The differential equation algorithm based on the time-domain differential equation model of transmission line does not involve the frequency-domain information of the signal, thus it is unaffected by the main frequency inconsistency between voltage and current of wind farm outgoing transmission line. But the high-frequency characteristic of the differential equation algorithm is poor. Compared with the traditional differential equation algorithm, two processes are gained in the equal transfer process-based distance protection, low-pass filtering and re-structuring of the voltage at the fault point, which significantly improves the performance of the algorithm. The PSCAD/EMTDC simulation results show that the distance element which employs the equal transfer process-based distance protection algorithm can trip correctly and quickly while unaffected by the wind power transient voltage and current no matter what kind of fault occurs in the protection scope.关键词
风电场/双馈感应发电机/送出线/解微分方程算法/等传变距离保护Key words
wind plant/doubly fed induction generator (DFIG)/outgoing transmission line/differential equation algorithm/equal transfer process-based distance protection分类
信息技术与安全科学引用本文复制引用
裘愉涛,潘武略,倪传坤,何荷,明浩..风电场送出线等传变距离保护[J].电力系统保护与控制,2015,(12):61-66,6.基金项目
国家自然科学基金资助项目(51477061，51077061)This work is supported by National Natural Science Foundation of China (No.51477061 and No.51077061) （51477061，51077061）
