改进的最佳平方逼近算法在电力系统中应用

Application of revised best square approach algorithm in power systems

介绍了最佳平方逼近算法的原理及其在电力系统中的应用。提出了一种改进的最佳平方逼近算法,不仅能准确、快速地计算出测量信号中的周期分量,计算精度受非周期分量影响小,而且通过简化正规矩阵计算,减少了计算量、提高了计算速度。对系统含有低频分量和不含低频分量2种情况进行了仿真,分别采用改进最佳平方逼近算法和最小二乘法计算电流基波和各次谐波,结果表明,在系统发生故障情况下,其对基波及各次谐波计算仍能保持较高精度,有效地提高了对电力系统测量信号的分析精度。

The principle of the best square approach algorithm and its applications in power system are introduced. A revised one is presented,which can work out rapidly and accurately the periodic component from measured signals with less influence of the aperiodic component. It simplifies the calculation of normal matrix to improve the speed. The systems with and without low-frequency components are simulated,and the fundamental and harmonic currents are calculated with both the revised best square approach algorithm and the least square method. Results show that the proposed algorithm has higher calculation accuracy under system fault condition,which improves the analytic precision of power system measurements.