دانلود رایگان مقاله انگلیسی طراحی کنترل حالت لغزشی انتگرال برای مبدل های DC-DC - الزویر 2018

Abstract

The development and implementation of an integral sliding mode control algorithm for closed loop control of a DC-DC buck converter is presented in this paper. Integral sliding mode controller (ISMC) is formulated to tackle the variable switching frequency problem faced during load and supply variations in conventional sliding mode controlled buck converters. Variable switching frequency is undesirable as it leads to complications while designing filters for the system. ISMC aims to alleviate this problem through appropriate transformation of the sliding mode control lawmaking use of pulse width modulation scheme. The control algorithm is validated through detailed simulation studies in MATLAB/Simulink environment. Comprehensive comparative assessment of the converter control system using ISMC is carried out with conventional sliding mode control (SMC) scheme which reveals the fixed frequency functioning of ISMC under diverse operating conditions.

5. Conclusion

An integral sliding mode control of a DC-DC buck converter feeding a resistive electronic load has been presented in this paper which proficiently achieves the aim of containing the switching frequency variations caused in conventional SMC system due to load and supply variations.The system under consideration was simulated under varying load and supply voltage operating conditions.Detailed comparative analysis of the ISMC was performed alongside a conventional SMC. The output voltage regulation under such operating conditions was found to be satisfactory with ISMC exhibiting slightly greater overshoot in voltage response during start-up than in conventional SMC. However, the average switching frequency variation with ±13.33% changes in supply voltage is greatly reduced from 19% in conventional SMC buck converter system to 1.2 %in ISMC. Thus, ISMC exhibits almost fixed frequency operation and provides an efficient means of implementing sliding mode control for DC-DC buck converter.