电网信号四象限功率测量原理及实现方法

Principles and Implementation of Four-quadrant Power Measurement for Electric Power Signals

针对传统电力仪表测量的功率不能正确反映电能计量点真实功率状态的缺陷,提出一种用于电网信号功率测量与分析的四象限功率测量原理及实现方法。首先深入分析了四象限功率测量原理。四象限功率测量原理从矢量的角度对功率进行分析,惟一确定了电能交换的真实状态和数值,提高了功率测量的准确度和适用性,是测量与分析电网信号功率的一种有效方法,既适用于功率传输方向确定的电能计量点的功率测量,也适应于功率传输方向变化的电能计量点的功率测量。然后给出了2种实现方法:间接法和直接法。最后给出了仿真验证结果,表明了四象限功率测量原理及实现方法的正确性和可行性。

Owing to the inability of the power measured with conventional instruments not to correctly reflect the actual power state at the electric energy measuring points, the four quadrant power measuring principles and implementation for measuring and analyzing the power of electric power signals are proposed. First an in-depth analysis is made of the principlcs of four quadrant power measurement, by which the power is analyzed from the point of view of the vector to uniquely determine the true state of electric energy exchange, thus increasing the accuracy and applicability of power measurement. As an effective method for measuring and analyzing the electric power signals, it is applicable not only to power measurement at electric energy measuring points with definite power transmission direction but also to that with variable power transmission direction. Then two implementing methods are given, the indirect method and direct method. Finally, the results of simulation are given, which show that the above-mentioned principles and implementing method are correct and feasible.