陶彩霞1,王伟斌1,祝曦2,高锋阳1,王冉冉1,杨乔礼1.带恒功率负载Buck变换器的模型预测控制[J].湖南大学学报:自然科学版,2021,(8):96~102
带恒功率负载Buck变换器的模型预测控制
A Model Predictive Control for Buck Converter with Constant Power Load
  
DOI:
中文关键词:  Buck变换器  恒功率负载  模型预测控制  高阶滑模观测器  小信号分析
英文关键词:Buck converter  constant power load  model predictive control  high-order sliding mode observer  small signal analysis
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作者单位
陶彩霞1,王伟斌1,祝曦2,高锋阳1,王冉冉1,杨乔礼1 (1. 兰州交通大学 自动化与电气工程学院甘肃 兰州 7300702. 国家铁路局装备技术中心北京 100891) 
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中文摘要:
      针对含恒功率负载(Constant Power Load,CPL)的Buck DC-DC变换器稳定性和负荷不确定性问题,提出一种含高阶滑模观测器的模型预测(Model Predictive Control,MPC)控制策略. 首先,根据MPC理论,构建Buck变换器的目标函数,建立滚动优化跟踪方程并求解最优控制律. 其次,构建高阶滑模观测器,提高电压的控制精度并消除抖振及相对阶问题. 最后,对其进行小扰动的稳定性分析,建立源、负载侧的等效模型. 在CPL与阻性负载投切较为频繁时,与传统双闭环PI调节和MPC控制进行比较,仿真结果表明:在负载变化时,基于高阶滑模观测器的MPC控制具有良好的动态性和鲁棒性且能对母线电压进行精确跟踪与控制.
英文摘要:
      To solve the problems of stability and load uncertainty of Buck DC-DC converters with constant power load (CPL),a model predictive control(MPC) strategy with high-order sliding mode observers is proposed. Firstly,the objective function of the Buck converter is constructed according to MPC theory,and the rolling optimization tracking equation is established to solve the optimal control rate. Secondly,a high-order sliding mode observer is constructed to improve the voltage control accuracy and eliminate chattering and the relative order problem. Finally,the stability analysis of small disturbance is carried out to establish the equivalent model of source and load side. When CPL and resistive load are switched frequently,the simulation results show that the MPC control based on high-order sliding mode observer has good dynamics and robustness,compared with the traditional double closed-loop PI adjustment and MPC control. In addition,it can control and track the bus voltage when the load changes.
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