Design, analysis, and implementation of an integral terminal reduced‐order sliding mode controller for a self‐lift positive output Luo converter via Filippov's technique considering the effects of parametric resistances

摘要

This paper analyzes the closed-loop stability of a self-lift positive output Luo converter under an integral terminal reduced-order sliding mode controller in continuous conduction mode. This converter has a high voltage gain and can be used in power sources, telecommunications, and industrial applications. However, the dynamic model of the proposed converter is highly nonlinear and time-varying, and also the series equivalent resistances of the diodes, switch, and inductors impact on the system function. In order to overcome these problems, a robust nonlinear controller is required to maintain the output voltage of the Luo converter at a fixed value. For this purpose, the proposed sliding mode controller is developed using Filippov's method considering the parasitic elements, load variations, and line disturbances. The controller performance is validated by simulations in PSIM software. Moreover, a laboratory prototype of the suggested control scheme has been constructed to highlight its effectiveness and feasibility. The results and comparisons demonstrate that the output voltage well tracks its reference signal under system uncertainties with a satisfactory response compared with the simple sliding mode approach.