| 引用本文: | 裘愉涛,潘武略,倪传坤,何荷,文明浩.风电场送出线等传变距离保护[J].电力系统保护与控制,2015,43(12):61-66.[点击复制] |
| QIU Yutao,PAN Wulüe,NI Chuankun,HE He,WEN Minghao.Equal transfer process-based distance protection for wind farm outgoing transmission line[J].Power System Protection and Control,2015,43(12):61-66[点击复制] |
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| 摘要: |
| 分析了具备低电压穿越(LVRT)能力的双馈式风电场送出线路故障暂态特性。风电送出线路风场侧保护测得的电压与电流主要频率分量不一致，致使传统的依据工频电压、电流相量的距离保护元件动作性能受到严重影响，无法正常工作。基于输电线路时域模型的解微分方程算法不涉及信号的频域信息，可以克服送出线电压、电流主频不同带来的影响，但受高频分量的影响较大。等传变距离保护相较传统的解微分方程算法，增加了低通滤波及故障点电压重构两个环节，显著改善了算法的测距性能。PSCAD/EMTDC仿真结果表明，线路不同位置处发生不同类型故障时，等传变距离保护算法均可以实现快速、准确测距。 |
| 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 |
| DOI：10.7667/j.issn.1674-3415.2015.12.010 |
| 投稿时间：2014-09-22修订日期：2014-11-26 |
| 基金项目:国家自然科学基金资助项目(51477061，51077061) |
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| Equal transfer process-based distance protection for wind farm outgoing transmission line |
| QIU Yutao,PAN Wulüe,NI Chuankun,HE He,WEN Minghao |
| (Zhejiang Electric Power Company, Hangzhou 310007, China;XJ Electric Co., Ltd., Xuchang 461000, China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology
(Huazhong University of Science and Technology), Wuhan 430074, China) |
| 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. |
| Key words: wind plant doubly fed induction generator (DFIG) outgoing transmission line differential equation algorithm equal transfer process-based distance protection |
