非正弦网络功率的分析

对于某些谐波频率来说,非线性负载或者是周期性时变负载不应该被认为是吸收能量的,而是作为电源来看待,这种现象可以用它的等效电路来解释。这种等效电路通常是由谐波电源和无源元件组成,这一等效电路产生的功率现象要比线性电路复杂得多。由于这些现象决定了输电效率及功率因数改善的可能性,影响了能量的计算,所以,有必要深入理解这些现象。本文提出的非正弦网络功率的分析方法是将视在功率分解成四个分量:有功功率、分散功率、无功功率、外加视在功率。这四个功率分量与有功电流、分散电流、无功电流三个具有不同物理意义、相互正交的电流分量有关。文章举了一个例子说明了各功率分量、电流分量的计算。

Analysis of Power in Nonsinusoidal Networks

For some harmonic frequencies, a nonlinear or periodically time-variant load has to be considered, not as a receiver, but as a source of energy. This can be explained in terms of its equivalent circuit. It is usually composed of passive elements and harmonic sources which make the power phenomena in such a circuit much more complex than that in a linear circuit. The necessity of comprehension of these phenomena stems from the fact that they determine the efficiency of the power transmission and the possibility of power factor improvement and affect the energy accounts. An analytic method of power in nonsinusoidal networks is suggested for the apparent power decomposition into four components, active power, scattered power, reactive power, and forced apparent power. Thiese power components are related to three mutually orthogonal current components (active current, scattered current, and reactive current) of distinct physical interpretation. An example is cited in this paper for illustrating the calculation of power and current components.