风电场送出线等传变距离保护

裘愉涛; 潘武略; 倪传坤; 何荷; 文明浩

引用本文:	裘愉涛,潘武略,倪传坤,等.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.
	QIU Yutao,PAN Wulüe,NI Chuankun,et al.Equal transfer process-based distance protection for wind farm outgoing transmission line[J].Power System Protection and Control,2015,43(12):61-66

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风电场送出线等传变距离保护
裘愉涛¹, 潘武略¹, 倪传坤², 何荷³, 文明浩³
1.浙江省电力公司，浙江杭州 310007;2.许继电气股份有限公司，河南许昌 461000;3.强电磁工程与新技术国家重点实验室(华中科技大学)，湖北武汉 430074

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

分类号:

基金项目:国家自然科学基金资助项目(51477061，51077061)

Equal transfer process-based distance protection for wind farm outgoing transmission line

QIU Yutao¹, PAN Wulüe¹, NI Chuankun², HE He³, WEN Minghao³

1.Zhejiang Electric Power Company, Hangzhou 310007, China;2.XJ Electric Co., Ltd., Xuchang 461000, China;3.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

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