Department of Electrical Engineering, Faculty of Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran.
Department of Electrical Engineering, Faculty of Engineering, Shahrekord University, Shahrekord, Iran.
ISA Trans. 2019 Feb;85:214-225. doi: 10.1016/j.isatra.2018.10.007. Epub 2018 Oct 22.
This study presents a novel control scheme for voltage regulation of a negative output cascade ultra-lift Luo converter (NOCULLC). Due to the complicated high order model of the converter, its performance is degraded against large load variations, input voltage changes and parametric uncertainties. In order to enhance the converter behavior, a PI compensator and a sliding mode current controller are combined to control the fourth order NOCULLC worked in a wide range of operating conditions. Because of the non-minimum phase structure of the converter, the output voltage of the converter is indirectly regulated by enforcing the input inductor current to track its reference signal. The sliding mode current controller improves the dynamic and static performances of the converter by minimizing the inrush current of the input inductor of the converter and also, the PI controller eliminates the steady state error of the output voltage of the converter. The closed loop system stability is demonstrated by using sliding mode theory. Furthermore, this paper proposes a systematic procedure to compute the gains of the controller based on the stability constraints which guarantees robustness of the developed controller. The experimental results show the robustness and effectiveness of the proposed controller against parametric variations and uncertainties of the converter. Also, a comprehensive comparison of the general aspects of the properties between the developed method and other existed controllers is provided.
本研究提出了一种新颖的负输出级联超高升压 Luo 变换器（NOCULLC）的电压调节控制方案。由于变换器的复杂高阶模型，其性能会因大负载变化、输入电压变化和参数不确定性而降低。为了增强变换器的性能，将 PI 补偿器和滑模电流控制器相结合，控制工作在宽工作条件下的四阶 NOCULLC。由于变换器的非最小相位结构，通过强制输入电感电流跟踪其参考信号来间接调节变换器的输出电压。滑模电流控制器通过最小化变换器输入电感的浪涌电流，改善了变换器的动态和静态性能，同时，PI 控制器消除了变换器输出电压的稳态误差。通过滑模理论证明了闭环系统的稳定性。此外，本文提出了一种基于稳定性约束的控制器增益计算的系统方法，该方法保证了所开发控制器的鲁棒性。实验结果表明，所提出的控制器对变换器的参数变化和不确定性具有鲁棒性和有效性。此外，还提供了所开发方法与其他现有控制器的一般性能方面的全面比较。
