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基于动态时间弯曲的差动保护算法

, PP. 133-141

Keywords: 发电机,差动保护,变压器,动态时间弯曲,多采样率,同步误差,匝间短路,抗电流互感器饱和

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Abstract:

多数字源环境下,保护从通信接口中接收不同采样率的数字量,导致差动保护误差较大。针对此问题,提出一种基于动态时间弯曲的发变组差动保护算法,利用该算法可比较差动保护两侧不同采样率数据序列的相似度,从而解决多数字源信号采样频率不一致问题,并且提高了保护的耐同步误差特性及速动性;同时,该算法通过设置浮动门槛,可在兼顾区外故障保护抗互感器(currenttransformer,CT)饱和性能的同时,进一步增强区内故障时保护的灵敏性。仿真结果表明,该保护在两侧不同采样率环境下可正确动作,且能够在轻微匝间故障时快速动作,动作时间约为15?ms。该算法为多数字源混和输入环境下保护算法的研究提供了新思路。

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