谐波干扰下电子式电能表动态计量误差分析

Analysis of dynamic measurement error of electronic watt-hour meter under harmonic interference

为了提高对谐波干扰下的电子式电能表动态计量误差分析性能,提出一种基于固有模态分解的谐波干扰下电子式电能表动态计量误差参量估计模型,建立谐波干扰下的电子式电能表的输出测量信号模型,采用时间间隔均衡采样方法进行计算数据采样,结合连续脉冲响应方法进行谐波干扰滤波,采用连续波谱检测方法进行误差测量,实现对谐波干扰下电子式电能表动态数据的固有模态分解,提取测量信号的谱特征,根据谱特征的偏移性进行误差估计。仿真结果表明,采用该方法进行谐波干扰下电子式电能表动态计量的误差较小,测量精度较高。

In order to improve the performance of dynamic measurement error analysis of electronic watt-hour meter under harmonic interference,a dynamic measurement error parameter estimation model of electronic watt-hour meter under harmonic interference based on inherent mode decomposition is proposed. The output signal model of the electronic watt-hour meter under harmonic interference is established. The time-interval equalization sampling method is used to sample the calculated data,and the harmonic interference filtering is combined with the method of continuous pulse response. Using the method of continuous wave spectrum to measure the error,the inherent mode decomposition of the dynamic data of the electronic watt-hour meter under harmonic interference is realized. The spectrum characteristic of the measured signal is extracted,and the error estimation is carried out according to the deviation of the spectrum characteristic. The simulation results show that,using this method,the error of dynamic measurement of electronic watthour meter under harmonic interference is small and the measurement accuracy is high.