高频电力线信息传输的电机模型与仿真

Modeling of a Motor at High Frequencies in Power Line Data Transmission

研究在电机驱动系统中,电力线通信的建模问题,着重讨论在高频时电机输入阻抗的特性下,电机模型的建立。通过实验测量得到电机和电力线在频率100 kHz～40 MHz的输入阻抗特性曲线,并分析高频输入阻抗的谐振特点。在Matlab中,提出基于阻抗公式的分析法、最小均方值误差估计法以及最优化方法进行模型的参数识别,将得到的参数代入模型中可以得到电机的阻抗模型。电机模型的精确度可以通过仿真曲线和测量曲线的逼近程度看出,从结果看仿真得到的阻抗曲线跟实际测量的阻抗曲线走向基本一致。

This paper studies the modeling of power line communication in a motor driving system. The emphasis is laid upon the establishment of the motor model under the condition of the characteristics of the motor input impedance at high frequencies. Through experiments, the input impedance curves of the motor and the power line at frequencies i00 kHz- 40 MHz are obtained, and the resonant characteristics of the input impedance under high frequencies are thus analyzed. In Matlab, by the use of the analysis method based on the impedance formula, the minimization error method and the optimization method, the parameters can be identified. Put the gained parameters into the model, and the impedance model of the motor thus comes into formation. The accuracy of the motor model can be shown through the approximation ratio between the simulation and measurement curves. And the tendency of the impedance curve by simulation is basically the same with that gained from the actual measurement.