基于Posicast控制的双向Buck-Boost变换器改进控制策略研究  

Research on Improved Control Strategy of Bidirectional Buck-Boost Converter Based on Posicast Control

作　　者：汤德荣[1] 刘苏英[1] TANG Derong;LIU Suying(Anhui Technical College of Mechanical and Electrical Engineering,Wuhu Anhui 241002,China)

机构地区：[1]安徽机电职业技术学院,安徽芜湖241002

出　　处：《长春工程学院学报（自然科学版）》2024年第3期43-49,共7页Journal of Changchun Institute of Technology：Natural Sciences Edition

基　　金：安徽省自然科学基金(2023AH052701)。

摘　　要：双向Buck-Boost变换器被广泛应用于锂电池等储能系统,常采用电压电流双环控制策略,存在动态超调大且有残留振荡等缺点,影响了储能系统的正常运行。提出基于Posicast控制的改进控制策略,首先,分析了双向Buck-Boost变换器不同工作模式的数学模型,介绍了Posicast控制器的基本概念,并给出了提升Posicast控制鲁棒性的设计方法。其次,基于变换器双环控制,将Posicast控制算法引入电流控制器,以改善系统的动态性能,并给出了不同模式下各控制器的设计方法,分析了电感参数变化时的系统鲁棒性。最后,通过功率为10 kW的双向Buck-Boost变换器样机平台,用试验验证了所提控制策略的正确性。Bidirectional Buck-Boost converters are widely used in energy storage systems such as lithium batteries.A voltage current dual loop control strategy is often adopted,which has disadvantages such as large dynamic overshoot and residual oscillation,affecting the normal operation of the energy storage system.An improved control strategy based on Posicast control is proposed.Firstly,the mathematical models of different working modes of bidirectional Buck-Boost converter are analyzed,the basic concept of Posicast controller is introduced,and the design method to enhance the robustness of Posicast is provided.Secondly,based on the dual loop control of the converter,the Posicast control algorithm is introduced into the current controller to improve the dynamic performance of the system.The design methods of each controller under different modes are given,and the robustness of the system when the inductance parameters change is analyzed.Finally,the correctness of the proposed control strategy is verified through experiments on a prototype platform of a bidirectional Buck-Boost converter with a power of 10 kW.

关 键 词：双向Buck-Boost变换器 PI控制 Posicast控制 动态性能 

分 类 号：TM912[电气工程—电力电子与电力传动]