电气技术  2018, Vol. 19 Issue (3): 55-59    DOI:
研究与开发 |
CCM Buck-Boost变换器非线性PID最优控制
兰志勇, 陈礼俊, 焦石, 李理, 王波
湘潭大学信息工程学院,湖南 湘潭 411105;
Nonlinear PID optimal control method applied to Buck-Boost converters
Lan Zhiyong, Chen Lijun, Jiao Shi, Li Li, Wang Bo
Information Engineering College of Xiangtan University, Xiangtan, Hu’nan 411105;
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摘要 为改善Buck-Boost变换器非线性系统的静态动态性能,本文将微分几何的非线性最优控制策略与传统PID结合,设计了一种针对Buck-Boost变换器输出电压进行调节的非线性PID最优控制器。控制器由两部分构成:①输出电压PI反馈控制,保证输出电压准确跟随期望电压;②系统状态反馈精确线性化最优控制,实现系统最优可控。该控制器保留了PID控制的优点,结构简单,易于实现。同时,引入了输出电压的非线性积分,有效的缩短过渡过程,提高稳态精度,增强了系统对参数变化的鲁棒性。实验波形对比分析显示,与传统PI控制方法相比,基于非线性PID最优控制策略的系统启动性能优越,稳态误差小,且对输入电压扰动和负载扰动均表现出更强的鲁棒性。
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兰志勇
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焦石
李理
王波
关键词 Buck-Boost变换器非线性PID最优控制精确线性化    
Abstract:In order to improve the control performance of DC/DC Buck-Boost power converters, a nonlinear optimal control strategy of differential geometry is combined with the traditional PID. The nonlinear PID optimal controller is designed to regulate the output voltage. This controller consists of two parts: one is the PI feedback control of the output voltage, to track the desired output accurately; the other part is the system state of linear accurate feedback model, realize the system optimal control. The controller retains the advantages of PID control, simple structure, easy to implement. It also can shorten the transition process, improve the steady-state accuracy, and enhance the system to the parameters of the robustness due to the nonlinear integral feedback of the output voltage. Compared with the traditional PID control method, the simulation results show that the system with the nonlinear PID optimal controller strategy, has small static error and superior performance, and has strong robustness to the input voltage disturbance and the load disturbance.
Key wordsBuck-Boost converter    nonlinear    PID    optimal control    exact linearization   
收稿日期: 2017-09-22      出版日期: 2018-03-19
基金资助:国家自然科学基金青年项目(51507148); 湖南省风力发电机组及控制重点实验室开放研究基金立项课题(2016FLFDYB02)
作者简介: 兰志勇(1980-),男,湖南茶陵人,博士,副教授,主要研究方向为大功率永磁同步电机设计及优化、精密伺服驱动器的研究与开 发等。
引用本文:   
兰志勇, 陈礼俊, 焦石, 李理, 王波. CCM Buck-Boost变换器非线性PID最优控制[J]. 电气技术, 2018, 19(3): 55-59. Lan Zhiyong, Chen Lijun, Jiao Shi, Li Li, Wang Bo. Nonlinear PID optimal control method applied to Buck-Boost converters. Electrical Engineering, 2018, 19(3): 55-59.
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