基于预测控制的宽范围输入直流变换器
发布时间：2019-06-01 14:41
【摘要】：在燃料电池供电系统、新能源发电系统等领域,宽范围输入直流变换器得到了广泛应用,其中,双管Buck-Boost变换器因具有输入输出电压极性相同、开关管电压应力低等优点成为研究热点。双管Buck-Boost变换器的传统控制方法根据输入电压范围选择工作模式,本文采用模型预测控制,通过在线优化选择最优的工作模式,为宽范围输入直流变换器的控制器设计提供一种方案。本文从双管Buck-Boost变换器的工作原理出发,分析了变换器的不同工作模式。在考虑电感电流实时变化条件下,通过求解系统状态方程,建立了双管BuckBoost变换器在Buck工作模式和Boost工作模式下的预测模型,为控制器的设计提供依据。结合双管Buck-Boost变换器和模型预测控制的特点,为了减少开关损耗,在传统三模式控制方式的基础上,提出了混合工作模式代替Buck-Boost工作模式。根据工作模式不同,构造了以输出电压和电感电流为优化量的代价函数。基于模型预测控制设计了只考虑开关管开通和关断两种情况的0-1简化算法;为了解决0-1简化算法电感电流纹波较大的问题,在不增加计算量的情况下设计了占空比估计算法;设计了根据系统状态和代价函数反解出最有占空比的公式解析算法。在Simulink软件平台进行仿真,对比了三种算法的控制效果。设计了双管Buck-Boost变换器的硬件参数,搭建18V~72V输入、36V输出的双管Buck-Boost变换器实验平台,采用DSP实现模型预测控制,对提出的控制算法进行了实验验证。实验结果表明将模型预测控制应用于宽范围直流变换器控制系统中的方案是可行、有效的。
[Abstract]:In the fields of fuel cell power supply system, new energy power generation system and so on, wide range input DC converter has been widely used. Among them, the double transistor Buck-Boost converter has the same polarity of input and output voltage. The advantages of low voltage stress of switch tube have become a hot research topic. The traditional control method of dual-transistor Buck-Boost converter selects the working mode according to the input voltage range. In this paper, the model predictive control is adopted, and the optimal working mode is selected by online optimization. It provides a scheme for the controller design of wide range input DC / DC converter. Based on the working principle of double-transistor Buck-Boost converter, the different working modes of the converter are analyzed in this paper. Under the condition of considering the real-time variation of inductance current, the prediction model of double-transistor BuckBoost converter in Buck mode and Boost mode is established by solving the state equation of the system, which provides the basis for the design of the controller. Combined with the characteristics of dual-transistor Buck-Boost converter and model predictive control, in order to reduce switching loss, a hybrid working mode is proposed to replace Buck-Boost mode on the basis of traditional three-mode control mode. According to the different working modes, the cost function with output voltage and inductance current as the optimized quantity is constructed. Based on the model predictive control, a simplified algorithm of 0 鈮，
本文编号：2490348
[Abstract]:In the fields of fuel cell power supply system, new energy power generation system and so on, wide range input DC converter has been widely used. Among them, the double transistor Buck-Boost converter has the same polarity of input and output voltage. The advantages of low voltage stress of switch tube have become a hot research topic. The traditional control method of dual-transistor Buck-Boost converter selects the working mode according to the input voltage range. In this paper, the model predictive control is adopted, and the optimal working mode is selected by online optimization. It provides a scheme for the controller design of wide range input DC / DC converter. Based on the working principle of double-transistor Buck-Boost converter, the different working modes of the converter are analyzed in this paper. Under the condition of considering the real-time variation of inductance current, the prediction model of double-transistor BuckBoost converter in Buck mode and Boost mode is established by solving the state equation of the system, which provides the basis for the design of the controller. Combined with the characteristics of dual-transistor Buck-Boost converter and model predictive control, in order to reduce switching loss, a hybrid working mode is proposed to replace Buck-Boost mode on the basis of traditional three-mode control mode. According to the different working modes, the cost function with output voltage and inductance current as the optimized quantity is constructed. Based on the model predictive control, a simplified algorithm of 0 鈮，
本文编号：2490348
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