利用磁滞回线辨识变压器励磁电感研究

Distinguishing magnetizing inductance of power transformer based on hysteresis loop

针对变压器在空载情况下副边电压,电流数据未知,励磁电感不易获取的缺陷,提出了利用变压器磁滞回线上的离散数据点求励磁电感的方法。该方法具体步骤是首先根据变压器空载时原边的电压电流采样数据点找出此时关于磁链与电流的函数关系(磁滞回线),然后由磁滞回线上关于磁链和电流的离散数据点找出算法求励磁电感。通过ATP和Matlab软件相结合,仿真出了磁滞回线和相对应的励磁电感,得出了磁滞回线和励磁电感变化情况与理论分析相符。此方法可以求出空载时的励磁电感。

On account of difficulty in finding magnetizing inductance when the transformer is no load and secondary-side voltage and current data are unknown, a method is put forward to solve magnetizing inductance of transformer based on hysteresis loop of dispersed data point. The concrete step is as follows. Firstly, according to the voltage and current sample data point of the primary-side when transformer is no-load, the hysteresis loop of flux linkage and current is found. Then magnetizing inductance is solved through flux linkage and current discrete data point of hysteresis loop. ATP and MATLAB simulation softwares are used to get hysteresis loop and magnetizing inductance. It is concluded that the hysteresis loop and variation of magnetizing inductance are similar to theoretical analysis. So the method can obtain magnetizing inductance when it is no load.