CAJ | 학술논문

提出一种基于三阶动态时间弯曲(DTW)算法的变压器差动保护算法。该方法利用差动保护两侧数据窗内的电流采样值构成最短距离矩阵,通过最短距离搜寻算法,在该矩阵内寻找到一条最短路径,将该路径所经过的局部最短距离元素的总距离的平均值作为两侧采样电流的差流。在数字化变电站由于通信原因造成数据延时及数据丢包的情况下,利用该差动保护算法,可使得区外故障时保护不误动作；区内故障时,保护可靠动作。仿真验证了不同延时状况及不同丢包率情况下,区内、区外故障时常规相量差动保护及DTW差动保护的动作性能。结果表明,DTW差动保护在抗延时性能、抗丢包性能及灵敏性上明显优于常规相量差动保护。
제출일충기우삼계동태시간만곡(DTW)산법적변압기차동보호산법。해방법이용차동보호량측수거창내적전류채양치구성최단거리구진,통과최단거리수심산법,재해구진내심조도일조최단로경,장해로경소경과적국부최단거리원소적총거리적평균치작위량측채양전류적차류。재수자화변전참유우통신원인조성수거연시급수거주포적정황하,이용해차동보호산법,가사득구외고장시보호불오동작；구내고장시,보호가고동작。방진험증료불동연시상황급불동주포솔정황하,구내、구외고장시상규상량차동보호급DTW차동보호적동작성능。결과표명,DTW차동보호재항연시성능、항주포성능급령민성상명현우우상규상량차동보호。
A transformer differential protection algorithm is proposed based on the third-order dynamic time warping (DTW). This method makes use of the current sample value within the bilateral data window of differential protection to constitute the shortest distance matrix.Via the shortest distance searching algorithm,a shortest path can be found in the matrix and take the average value of local shortest distance elements in the matrix through which the path passes as the differential current of bilateral sample current.Should data delay and data packet-loss happen in a digital substation for communication reasons,by using this differential protection algorithm,protection malfunction due to external faults can be avoided and protection can act reliably during internal faults.Simulation has verified the action performance of conventional phase differential protection and DTW differential protection during external or internal faults in different delay circumstances and different packet loss rates conditions.The results show that DTW differential protection has obvious advantages over conventional phase differential protection in delay-resistant,packet loss-resistant performance and sensitivity.