中性点接地电力系统铁磁谐振理论分析

Theoretical Research on the Ferro-Resonance in Neutral-Grounded Power System

中性点接地电力系统的铁磁谐振是电力工程中的重要问题。目前的研究方法大致分为实验研究、仿真研究、理论研究3种。实验研究和仿真研究有独特的优势,但理论分析不够全面和深入。由于目前还没有合适的理论的描述,使该问题的深入研究受到很大的局限。因此,为了寻找一种恰当的理论描述方式,利用线性系统的理论结合采用非线性电路的相关方法,建立了对中性点接地电力系统的铁磁分析的理论模型,并利用平衡点理论,得到了消除这种谐振的理论条件。利用这些条件,可以很方便地分析系统中的各参数在谐振下的作用,特别是可以找出消除中性点接地电力系统的铁磁谐振的相关参数条件,这在电力工程中有重要的应用价值。

The ferro-resonance in neutral-grounded power system is a very important problem in electrical engineering. The recent research methods includes experimental research, simulative research and theoretical research. Experimental research and simulative research have their own peculiar advantages,but without the overall and deep-going ability compared with theoretical research. Because at present there is no appreciate theoretical description for this problem, deep-going research of this problem is largely limited. So,in order to research a appreciate theoretical description,with the help of the linear system theory and nonlinear circuit theory, the theoretical model on the ferro-resonance in neutral-grounded power system was set up. And the theoretical condition for eliminating this kind of ferro-resonance are obtained based on balance-point theory. From these conditions, the functions of different elements in the system ,especially the related condition for clearing-up this kind of resonance which has important practical value in electrical engineering, can be analyzed systematically.