摘要
本文用变压器数字式差动保护的仿真模型,求得变压器的涌流和故障电流波形,并以此为依据,研究在变压器差动保护中用卡尔曼滤波算法时,其滤波方程中各参数的选择原则及滤波的状态方程数,分析了卡尔曼滤波在时间常数设定不精确情况下和频率变化时的滤波性能,并指出文献[1]计算结果的局限性。文中提出的结论,均经过大量计算,对卡尔曼滤波在数字保护中的应用有普遍意义。
This paper uses imitation model of digital differential protection of transformer to obtain current waves in inrush and fault conditions, which is the base to analyse the selection principle of each parameter in KALMAN filter equation when KALMAN filtering algorithm is used in differential protection of transformer, and also to analyse filtering characters of KALMAN filter under the conditions of inperfect decay time constant and of frequency-varied. The limitation of the results in reference[1] is indicated. The results in this paper are obtained through large calculations, which have common sense for the application of KALMAN filter in digital protection.
