Design and evaluation of a protection algorithm for a wind turbine generator based on the fault-generated symmetrical components
Design and evaluation of a protection algorithm for a wind turbine generator based on the fault-generated symmetrical components
复制标题
基于故障对称分量的风电机组保护算法设计与评估
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Y. Kang
中科院分区：
文献类型：
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作者：
T. Zheng;S. Cha;B. Lee;P. Crossley;M. Song;Y. Kang
提出了一种基于故障对称分量的涡轮机保护方案。在第1阶段，继电器使用故障电流中的正序分量的大小来区分连接到同一馈线的并联WTG上的故障，或者相邻馈线上的故障与连接的馈线上的故障、收集总线上的故障、内部联络线上的故障或电网上的故障。对于前一种故障，继电器应保持稳定和快速动作，而对于后一种故障，则需要瞬时或延时跳闸。在阶段2，首先使用故障生成的对称分量的关系来评估故障类型。然后，故障电流中正序分量的大小再次用于决定瞬时或延迟操作。继电器的操作性能，然后使用各种故障情况下使用EMTP-RV建模验证。这些场景涉及故障的位置和类型以及故障相的变化。结果证实，继电器可以成功地区分故障，需要一个瞬时，延迟或非操作响应。
A protection relay for a wind turbine generator (WTG) based on the fault-generated symmetrical components is proposed in the paper. At stage 1, the relay uses the magnitude of the positive-sequence component in the fault current to distinguish faults on a parallel WTG, connected to the same feeder, or on an adjacent feeder from those on the connected feeder, on the collection bus, at an inter-tie or at a grid. For the former faults, the relay should remain stable and inoperative whilst the instantaneous or delayed tripping is required for the latter faults. At stage 2, the fault type is first evaluated using the relationships of the fault-generated symmetrical components. Then, the magnitude of the positive-sequence component in the fault current is used again to decide on either instantaneous or delayed operation. The operating performance of the relay is then verified using various fault scenarios modelled using EMTP-RV. The scenarios involve changes in the position and type of fault, and the faulted phases. Results confirm that the relay can successfully distinguish between faults that require an instantaneous, delayed or non-operation response.