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中文摘要：
磁悬浮轴承开关功率放大器系统为一非线性系统,开关功率放大器的性能影响磁悬浮轴承控制系统的稳定性,为此,提出了一种建立磁悬浮轴承开关功率放大器系统模型的方法。在分析三电平功率放大器工作原理的基础上,对系统中非线性部分进行分析,以相应的傅里叶级数表达式来代替,建立了非线性网络的传递函数并推导了开关功率放大器闭环系统的稳态数学模型。MATLAB软件的仿真和试验验证结果表明,该系统模型能有效反映开关功率放大器和闭环控制系统的实际工作特性,建模的方法是可行有效的。
英文摘要：
Switching power amplifier of magnetic bearing was a nonlinear system.The performance of the switching power amplifier affected the stability of the magnetic bearing control system.A way of establishing the closed-loop system model of magnetic bearing was presented.Based on the analysis of three-level power amplifier principle,the nonlinear circuit model was replaced by using Fourier series and the transfer function of the nonlinear net was established.A closed-loop system math model of three-level power amplifier was obtained.The model was verified by MATLAB simulations and experiments.The results show that the deduced system model can effectively reflect the actual characteristics of control system for three-level power amplifier and the proposed model is feasible and effective.
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