一种提高系统稳定性的改进谐振控制器

通过分析输入与输出信号的频域关系,推导了一种改进谐振控制器,该控制器与传统控制器具有不同的形式,通过频域分析可以得到,改进谐振控制器与传统谐振控制器有着相同的作用,在谐振频率处具有较高的增益,能够实现对交流信号的无静差跟踪,而且改进谐振控制器在谐振频率处具有较大的相位裕度,有利于增强系统稳定性。采用电压电流双环控制,控制器采用改进谐振控制器,通过分析不同负载下系统开环传递函数,说明了改进谐振控制器的控制效果,最后通过仿真实验验证了理论分析的正确性。

Application of Improved Resonant Controller in Medium Frequency Inverter

By analyzing the frequency-domain relationship between the input and output signals,an improved resonant controller was derived.The controller had different forms from the traditional controller and could be obtained by frequency domain analysis.The improved resonant controller had the same function as the traditional resonant controller and had a high gain at the resonant frequency,which could track the AC signal without static error.Moreover,the improved resonant controller had a large phase margin at the resonant frequency,which was helpful to enhance the stability of the system.The voltage and current double loop control was used,and the improved resonant controller was used in the controller.By analyzing the open loop and closed loop transfer functions of the system,the improved resonant controller was explained.In the end,the correctness of the theoretical analysis was verified by the simulation experiment.