一种基于S变换的动态电能计量算法

现代电力系统中的电压、电流已不再是较理想的稳态正弦波,具有复杂的动态变化特征。动态条件下如何才能足够准确地计量电能,已越来越受到关注。文中从S变换的数学原理出发,提出了一种动态电能计量算法。具体将电能的直流、基波、谐波和间谐波分量分开测算,利用行业协会团体标准中的六种动态测试信号作为该算法的输入,对其在稳态和非稳态情况下的电能计量性能和误差进行了仿真测试和分析,结果验证了相比于现有的两类典型算法,所提出算法在动态条件下能够更准确地计量电能。

A dynamic electric energy metering algorithm based on S transform

The voltage and current in modern power systems are no longer ideal steady-state sine waves, and have complex dynamic characteristics. It has?attracted some attention on how to accurately measure electric energy under dynamic conditions. The paper, based on the S transform principle, proposed a dynamic electric energy metering algorithm, which divides electric energy into four components, i.e. DC electric energy, fundamental wave electric energy, harmonic electric energy and inter-harmonic electric energy. To verify the proposed algorithm, various dynamic voltage and current waveforms are used as test signals, and the performance and errors of the electric energy metering under steady and non-steady states are analyzed. The obtained results verify that, compared with two conventional algorithms, the proposed algorithm has a better accuracy for measuring electric energy under dynamic conditions.