电力负荷的谐波建模

电力负荷的谐波响应可以用其集总效应来描述.文章叙述了电力负荷谐波建模的研究现状;提出了通用谐波模型和利用系统辨识技术建立电力负荷谐波模型的新方法.通过对星形和三角形不同联接方式下负荷模型的分析,导出了描述三相负荷集总效应的数学表达式,并将单相负荷谐波的建模方法推广到三相负荷谐波建模.用一虚拟算例说明了三相负荷谐波建模过程中应当注意的问题.

HARMONIC MODELING OF ELECTRIC LOADS

The harmonic response of electric loads can be characterized by their aggregate effect. In this paper firstly the development of studies in modeling electric loads is reviewed, then a versatile harmonic model for power load is provided and a new method to establish the harmonic models of power loads based on system identification technique is presented. Through the analysis on the two power load models with different connections, the mathematical expressions describing the aggregate effect of three phase loads are derived, and the modeling method for single phase power load is spreaded to three phase power loads. At last, the problems during the modeling which should be paid attention to are illustrated by a virtual example.