适用于双馈风电场联络线的距离保护方案

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摘要风电场联络线作为风电场向电网输送功率的重要通道,其稳定运行对于风电场和电网的安全稳定运行具有重要影响。双馈风电机组故障电流特性复杂,将导致基于全波傅里叶算法的传统距离保护应用在双馈风电场联络线上时性能严重劣化,难以满足实际电网安全运行要求。因此提出一种距离保护方案。该方案以瞬时值表征的微分方程算法为基础,通过数字低通滤波、故障点电压重构和故障距离迭代计算等技术保证距离测量的正确性。仿真结果表明,该距离保护方案的整体性能明显优于传统距离保护方案,可较好地满足工程应用要求。

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	杨增力
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	周虎兵

关键词 ：双馈风电场, 联络线保护, 距离保护, 保护算法, 仿真分析

Abstract：Since the interconnection line of wind farm is the key for power transmission from wind farm to power grid, its operation safety plays an important role to operation stability of power grid. The complicated fault current characteristics of doubly-fed induction generator (DFIG) deteriorate the performance of the conventional distance protection schemes when they are applied on the interconnection lines of DFIG-based wind farm. Therefore, a new distance protection scheme is proposed in this paper. The proposed scheme is based on the R-L differential equation represented by the instantaneous values. Moreover, a series of measures ensures the accuracy of the measured fault distance, such as the low-pass filter, reconstruction of voltage at the fault point and iterative calculation of the fault distance. Simulation cases show that the performance of the proposed distance protection scheme is much better than that of the conventional distance protection schemes.

Key words： Doubly-fed induction generator based wind farm, interconnection line protection, distance protection, protection algorithm, simulation study

收稿日期: 2014-09-03 出版日期: 2017-01-03

PACS:

TM77

基金资助:国家自然科学基金资助项目（51177058、51077061）

作者简介: 杨增力男,1982年生,博士,高级工程师,研究方向为电力系统继电保护。E-mail: yangzl8@hb.sgcc.com.cn;孔祥平男,1988年生,博士,研究方向为应对分布式电源大规模接入的电力系统继电保护及安全稳定控制。E-mail: kongxphust@163.com（通信作者）

引用本文:

杨增力, 孔祥平, 王力军, 张哲, 周虎兵. 适用于双馈风电场联络线的距离保护方案[J]. 电工技术学报, 2016, 31(24): 252-260. Yang Zengli, Kong Xiangping, Wang Lijun, Zhang Zhe, Zhou Hubing. Distance Protection Scheme for Interconnection Line of Doubly-Fed Induction Generator Based Wind Farm. Transactions of China Electrotechnical Society, 2016, 31(24): 252-260.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I24/252

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