电网瞬时频率的一种跟踪算法

An Algorithm for Tracking Instantaneous Frequency of Power Grid

基于双正交数字滤波器与加权平滑相位差分法,提出了一种跟踪电网瞬时频率的方法,改进了目前基于双正交数字滤波器的电网频率跟踪方法。针对电力信号的几种模型,详细仿真了跟踪算法的动态特性,指出针对恒频率和变频率电力信号的跟踪误差分别为0.0001Hz和0.005Hz,并具体分析了影响跟踪误差和滞后效应的因素。研究表明,该方法不受同步采样限制,可较为准确、实时地跟踪各种电力信号的瞬时频率,其性能指标优于同类文献中的跟踪算法。

Based on dual orthogonal digital filters and weighted smoothing phase-dlfference method, an algorithm for tracking instantaneous frequency of power grid is proposed, which improves the dual orthogonal digital filter used currently. Detailed simulations on several typical models of power signals have been carried out to verify the algorithm＇s dynamic characteristics. Simulation results show that the frequency tracking errors are 0.000 1 Hz and 0.005 Hz respectively for constant-frequency and fluctuating-frequency power signals. The impact factors of tracking error and time delay are analyzed accordingly. The results show that, the algorithm is not subjected to the synchronized sampling criteria and can track the instantaneous frequency of different kinds of power signals accurately and instantly.