An Improved Method of Jiles-Atherton Hysteresis Model Based on Variable Time-Step Simulation

To efficiently and accurately model the waveform characteristics of the magnetizing inrush current, an improved hysteresis model based on the Jiles-Atherton theory is proposed, which mainly improves the simulation efficiency. Based on classical theory, considering the characteristics of the large slope of the linear region of the hysteresis loop and many high-frequency components, interpolation and heuristics are introduced to solve the problem of low simulation efficiency in small time steps. Finally, an improved transformer model is established on the CloudPSS simulation platform, and the accuracy and efficiency of the model were verified by comparing the running time and waveform matching degree.

I. Introduction

With the development of large-scale power system, accurate and efficient analysis of system-level electromagnetic transient (EMT) phenomena becomes increasingly important. Among these transients, the overvoltage caused by transformer inrush current attracts extensive attention. The severe inrush current are mainly generated during the start-up or reclosing process of the transformer, due to the saturation and remanence of the core. Such transients can easily lead to switching overvoltage and result in mis-operation of the relay protection device. In large-scale AC-DC system, it may transfer through the power networks and cause commutation failures of remote HVDC lines.