畸变电功率的模型化测量方法

本文为畸变电功率提出了一模型化的测量方法。在对待测畸变瞬时功率信号建立一参数化模型的基础上，证明了畸变电功率可由其瞬时功率信号采样值的加权平均准确获得，并推导出了由采样值求权参数的方法。提出的方法，允许畸变的瞬时功率信号含有电网频率的非整数次谐波（Ｓｕｂｈａｒｍｏｎｉｃ），允许采样过程小于电网的周期，据此方法获得的测量结果在理论上严格成立。一个算例验证了其有效性

A Measurement Approach of Distorted Power Based on Model

A method based on model to measure the distorted power is proposed in this paper. First, a parametric model via the signals of distorted instantaneous power is deduced. It is shown that the distorted power can be accurately obtain on account of weight a verage of the sampling values which are the signals of distorted instantaneous power. Next, an approach to calculate weight indexes are inferred.The proposed method in this paper permits that the signals of distorted instantaneous power include subharmonic, and that the sampling periods are much less that of signals. Yet the measurement results are theoretically strict accuracy under given conditions. An example shows the validity about the proposed method.