外加驱动控制法在Buck变换器非线性现象控制中应用

Application of external drive control method in the control of nonlinear phenomenon of Buck converter

针对电压模式控制Buck变换器运行时参数变化导致系统出现分岔和混沌等非线性现象问题,结合Buck变换器电路结构及其精确状态方程模型,运用Matlab/Simulink软件建立仿真模型并加驱动控制信号,通过控制信号幅值及相位调节,使系统达到最优非线性控制结果。仿真结果表明,当系统电路参数变化时,采用外加驱动控制法可有效抑制系统中非线性现象,系统稳定运行,通过搭建电压模式控制Buck变换器实验平台验证该方法对控制非线性现象具有可行性。

For variation of parameters when voltage mode control Buck converter in operation, which resulted in nonlinear phenomena such as bifurcation and chaos problem. With the circuit structure of Buck converter and its exact state equation model, Matlab/Simulink simulation software was used to establish the simulation model, and the simulation model has added driving control signal, through adjusting the control signal amplitude and phase, the system achieved an optimal nonlinear control results. Simulation results showed that the nonlinear phenomena in the system could be effectively suppressed by using external drive control method and the system stable operation, when the system circuit parameters changed. Verify feasibility of the method in controlling nonlinear pheno- mena by building a voltage mode control Buck converter experiment platform.