基于整数阶PI无源控制的Boost变换器研究

为了解决在负载扰动和系统阻尼变化的条件下,Boost变换器存在电感电流超调量大的问题,采用整数阶PI无源控制策略进一步提高系统的动态稳定性。首先,将整数阶PI控制方法引入到传统的无源控制器,有效地提高了系统的控制性能。其次,采用Cohen-Coon法整定最优整数阶PI控制参数,从而达到降低电流纹波的目的。仿真结果表明,整数阶PI无源控制策略能够有效地抑制电感电流的瞬态超调,并具有响应速度快和鲁棒性强等优点。最后,在NI-PXI平台上搭建了整数阶PI无源控制器,通过电路实验验证了该方法的可行性。

Study on Boost converter based on integer order PI passive control

In order to solve the problem of large overshoot of inductive current in Boost converter under the condition of load disturbance and system damping change,the integer order PI passive control strategy was adopted to further improve the dynamic stability of the system.Firstly,the integer order PI control method was introduced into the traditional passive controller,which effectively improved the control performance of the system.Secondly,Cohen-Coon method was used to set the optimal integer order PI control parameters,so as to reduce the current ripple.The simulation results show that the integer order PI passive control strategy can effectively suppress the transient overshoot of the inductive current,and has the advantages of fast response and strong robustness.Finally,the integer order PI passive controller was built on the NI-PXI platform,and the feasibility of the method was verified by circuit experiments.