基于功率潮流分析的电能计量新方法

Method of active power measurement under condition of distortion signal

针对非平稳畸变信号条件下电能准确合理计量问题,在非线性负载泛函级数模型的基础上,进行了功率潮流分析并提出畸变信号条件下电能计量新方法。根据泛函级数理论中Wiener核与Volterra核转换定理求得负载的Volterra核,应用Volterra级数理论将正弦输入信号条件下负载输出电流与电压用Volterra泛函级数表示。利用小波分解与重构算法对电流与电压信号进行分解与重构,求出功率潮流分析所需电流与电压的基波分量与畸变分量。结合IEEE-Std1459-2010标准定义,以半导体整流器、电力机车及两者组成的复合系统为例,对非线性负载进行功率潮流分析,依据各功率潮流的物理意义及潮流方向,提出畸变信号条件下电能计量新方法。仿真结果表明非线性负载功率潮流仿真结果与理论结果一致,基于功率潮流分析的电能计量新方法能够实现畸变信号条件下电能的合理计量。

For the problem of electrical energy measurement under the condition of non-stationary distortion signal, the power flow of the non-linear power load was analyzed based on the functional series models and a novel method of electrical energy measurement under the condition of distortion signal was presented. The Volterra kernel was calculated with Wiener kernel of non-linear power load on the conversion theorem of Wiener kernel and Voherra kernel. Then the output signal of sine input signal was expressed with Volterra functional series. The fundamental component and distortion component of current and voltage for power flow analysis was acquired with the decomposition and reconstruction of current and voltage signal using wavelet theory. The power flow analysis of non-linear power load was completed with the exam- ples of semiconductor rectifiers, electric locomotives and their composition, following the IEEE-Std1459- 2010 standard. A new method of power measurement under the condition of distortion signals is raised ac-cording to the physical meaning and flow direction of the electrical energy flow. The simulation results show consistency with theoretical result. This proves the new method based on the power flow analysis can implement the reasonable measurement of the electrical energy under the condition of distortion signal.