ABSTRACT

In this article, a new discrete-time sliding mode predictive control (DSMPC) with a PID sliding function is proposed for synchronous DC–DC buck converter, and its stability analysis is reported. The model predictive control, along with digital sliding mode control (DSMC), is able to further reducing the chattering phenomenon, steady-state error, overshoot and undershoot. The proposed control implementation only requires output error voltage evaluation. The effectiveness of the proposed DSMPC is proved through simulation results executed by the MATLAB/SIMULINK software. These results demonstrate its superior performance to DSMC. In other words, it represents a significant reduction of the chattering, overshoot and undershoots of output voltage response by an optimised control law during load and line variations. The proposed DSMPC almost overcomes the steady-state error (0.02%) and decreases the ripple value to about 0.2%. The overshoot and undershoot are 1.5% and 1%, respectively. Moreover, when the input voltage is changed by 26%, there is approximately no overshoot and undershoot. Also, some experimental results are presented to further illustrate the effectiveness of the proposed system. Experimental studies have been performed using a Spartan-6 field programmable gate array platform by Xilinx for the implementation of the digital control and relevant logic.

摘要

本文针对同步 DC-DC 降压转换器提出了一种新的具有 PID 滑动函数的离散时间滑模预测控制 (DSMPC)，并对其稳定性进行了分析。模型预测控制与数字滑模控制 (DSMC) 一起能够进一步减少颤振现象、稳态误差、过冲和下冲。建议的控制实施只需要输出误差电压评估。通过 MATLAB/SIMULINK 软件执行的仿真结果证明了所提出的 DSMPC 的有效性。这些结果证明了其优于 DSMC 的性能。换句话说，它表示通过优化的控制律在负载和线路变化期间显着减少输出电压响应的抖动、过冲和下冲。所提出的 DSMPC 几乎克服了稳态误差 (0.02%) 并将纹波值降低到约 0.2%。过冲和下冲分别为 1.5% 和 1%。此外，当输入电压变化 26% 时，几乎没有过冲和下冲。此外，还给出了一些实验结果，以进一步说明所提出系统的有效性。使用赛灵思的 Spartan-6 现场可编程门阵列平台进行了实验研究，以实现数字控制和相关逻辑。给出了一些实验结果以进一步说明所提出系统的有效性。使用赛灵思的 Spartan-6 现场可编程门阵列平台进行了实验研究，以实现数字控制和相关逻辑。给出了一些实验结果以进一步说明所提出系统的有效性。使用赛灵思的 Spartan-6 现场可编程门阵列平台进行了实验研究，以实现数字控制和相关逻辑。