A Novel Approach to MPPT Photovoltaic Power Systems Using Sliding Mode Control and Iterative & Bisectional Technique

This paper presents an adaptive control method that is combined Sliding Mode Control (SMC) and the Iterative & Bisectional (IB) technique applied in maximum power point trackers (MPPT) of photovoltaic power systems. Mathematical models of photovoltaic power generation and a DC/DC boost converter corresponding to different operating conditions will be introduced to make clear objects and the research approach. A sliding surface is proposed with coefficients that are functions of the solar irradiance power. An equivalent control signal will be determined and the stability analysis will be also mentioned. Received simulation results carried out by MATLAB/SIMULINK software showed that the designed adaptive controller worked with high accuracy, especially in different variations of solar irradiance, maintaining stability and reducing the hysteresis band. The proposed method fixes the disadvantage of sliding mode control in the hysteresis band applied in photovoltaic power generations. The results also present the high accuracy of mathematical models and the feasibility of the proposed control method using real systems.