交流电力测试系统中关键采样点的估计方法研究

Research on Estimation of Key Sampling Point in AC Power Test System

以交流电压为例,分析了交流电力测试系统信号处理中关键采样点对特征参数的影响,提出了关键采样点基于误差最小均方法和拉格朗日插值法的估计方法,指出这些方法能提高测试的抗干扰能力,在不增加额外硬件开销的情况下有效提高测试系统的精确性和可靠性。实验结果表明,采用这些估计方法可减少2倍左右用于分析的采样点数,初始相位角的测试误差减小到原来的25%左右,干扰幅值的要求从小于信号幅值的5%可放宽到信号幅值的15%。

Based on AC voltage,the effect of key sampling data on the parameters of characteristics during the voltage signal processing in AC power test system was analyzed.Estimation methods of key sampling data based on error LMS method and Lagrange interpolation were proposed.It was pointed out that the estimation methods could enhance the anti-jamming capability and improve the accuracy and reliability of the test system effectively without additional hardware overhead.Simulation results show that the estimation methods can reduce number of the sample data for the power analysis by about two times,the test error of the initial phase angle to about 25%,and the noise amplitude can be permitted from less than 5% to 15% of signal amplitude.