Stabilization of DC/DC Converter with Constant Power Load using Exact Feedback Linearization Method based on Backstepping Sliding Mode Control and Nonlinear Disturbance Observer

Abstract

Qualitative advancement in DC microgrids (MGs) has provided the use of various loads with special conditions and characteristics in the power grid. Optimal control of such grids requires the introduction of new tools and methods in the fields of power electronics. In this research work, by merging sliding mode and backstepping control approaches, the stability of DC-MG system using boost converter and constant power load (CPL) with nonlinear disturbance observer (NDO) is guaranteed. In this regards, first, the linear model of the canonical brunovsky form of the system is extracted to solve the problem of nonlinearity of the system, due to the existence of CPL and the problem of non-minimum phase of the boost converter. Then, using a nonlinear observer, the disturbance is estimated. Also, by combining sliding mode control and backstepping control, the desired control technique is implemented, and the overall stability of the system is achieved. In order to verify the effectiveness of the proposed stabilizing technique, the simulation is performed in MATLAB software package and the results confirm the superiority of dynamic proficiency and higher robustness of the suggested controller compared to other controllers.