DC/DC变换器模糊控制和PID控制比较研究

Comparative Study of Fuzzy Control and PID Control for DC/DC Converters

模糊控制器因具有控制鲁棒性强,设计不依赖于被控对象精确模型等优点而逐渐应用在电力电子变换器中。以Boost变换器为例,从设计方法、具体工程实现和实验结果三方面对传统线性比例积分微分(PID)控制器和模糊控制器进行了对比分析。详细阐述了PID控制器和模糊控制器的设计方法,对其设计的侧重点进行了对比。通过实验对比了线性PID控制器与模糊控制器的控制性能。实验结果表明,模糊控制技术相对于线性PID控制技术更能适应DC/DC变换器工作点的变化,具有更好的动态控制效果。

Fuzzy logic controller is now gradually being employed in power electronic converters, because it has strong robustness to the varying of operational conditions, and relevant to the designing is independent with the accurate model of the control objects.The conventional linear PID controller and fuzzy logic controller are compared for application to the Boost DC/DC converter.Comparison is made with regard to design methodology and experimentally measured performance.The design methodology of both PID and fuzzy logic controller are analyzed.The controlled performances using these two controllers are compared based on the experimental results performed by a prototype of a Boost converter.The results of which indicate that the fuzzy logic controller is much superior to the conventional linear PID controller.