数字保护中两种算法的比较研究

Comparison of two algorithms in digital protection

针对信号中非周期分量、频率偏移、分数次谐波和初相角变化对基波分量计算精度的影响,对卡尔曼滤波与全周傅氏算法进行了分析比较。仿真试验中的线路模型采取了依频线路模型,因此更接近实际情况。对各种故障进行大量的仿真试验,得出的结论是卡尔曼滤波在精度和速度上要优于傅氏算法。此结论对工程实际应用具有一定的指导意义。

This paper compares the Kalman filtering algorithm with one-cycle Fourier algorithm in the aspects of aperiodic component, frequency deviation, fractional harmonic and initial phase angle. The frequency dependent line model is adopted in the simulation tests. Through simulation tests of all kinds of line faults, it is concluded that the Kalman filtering algorithm is better than the Fourier algorithm in the speed and accuracy.