电功率微机测量新算法的研究

Study on Novel Algorithm for Electric Power Measurement

详细分析了电功率与电压、电流分量之间存在的逻辑关系,提出了一种基波及谐波电压、电流分量的提取算法和等效瞬时导数法,给出了基波及谐波瞬时有功功率和无功功率的定义,提出了一种新的电功率微机测量新算法。数学推理和仿真结果表明,该算法能够从任意时刻开始计算,无需获得电压、电流的具体幅值和相位信息,能够克服基于频域分析常规算法的一些缺陷,有利于提高电功率测量的准确性和稳定性;所需的数据窗少,对滤波器的要求较低;数学公式不复杂,运算量小,有利于微机的实现和电功率的高精度测量。

The logic connection in the electric power and voltage and current components is introduced. A new method of extracting fundamental and harmonic components and instantaneous derivative method is suggested. Two concepts of instantaneous active and reactive power of fundamental harmonic components are defined. A new digital algorithm for electric power measurement is proposed to improve the precise. The extent of depending on the high-wavelet＇s ability can be well promoted. It can start computing at any time without obtaining the amplitude and phase information of the fundamental and harmonic components, which overcomes some insufficient aspects of regular algorithms, and improves the precise and stability of electric power measurement. Mathematical reasoning progress and simulation resuits show that, this algorithm has better real-time performance and less length of digital filter window, and has simple mathematical expressions and less calculation.