磁滞回线测量方法与Simulink仿真分析研究

针对变压器磁滞回线间接测量存在的电路参数复杂和测量结果准确性难以评价等问题,通过对RC积分器测量方法的电路时域微分方程求解和Simulink仿真结果的分析,提出了一种确定电路参数的方法。借助Simulink饱和变压器的模型,仿真测量了在不同电压下饱和变压器磁滞回线图像,进一步画出了基本磁化曲线;通过对比基本磁化曲线测量值与Simulink中模型值的差异,结果显示利用该方法能仿真得到饱和变压器的磁滞回线,其测量误差可用电路参数估算和控制。根据该方法设计了测量电路,得到了实际变压器的磁滞回线,验证了该方法的正确性。研究结果表明,该方法揭示了RC积分法测量的电路参数,并能预测测量误差,具有准确性高的特点,为非线性饱和变压器磁滞回线测量电路参数设计提供了参考依据。

Analysis of hysteresis loop measurement and Simulink simulation

Aiming at the problems of circuit parameters and measurement accuracy of the hysteresis loop,the method to determine RC integrator circuit parameters was put forward.The method was based on the results of the time domain differential equation and Simulink simulation.A group of hysteresis loops were simulated at different voltages according to the transformer model in Simulink.Then,the fundamental magnetization curve was plotted.Compared with the Simulink model curve,the simulation curve was plotted.The error of measurement was estimable and controllable by the circuit parameters.Based on the method,an experiment was designed.The real transformer hysteresis loop was measured,and the method was proved right.The results indicate that the proposed method reveals the circuit parameters and predicts the error of measurement.The method is characterized of high accuracy,and the reference basis of circuit design is provided for hysteresis loop measurement of nonlinear saturable transformer.