Maximum Power Tracking and Current Control for Solar Photovoltaic System Applications, Hybrid Dynamical System Approach

The problem of a DC-DC buck converter control to extract the maximum power from a photovoltaic (PV) system is considered in this paper. A controller is proposed based on the hybrid dynamical system approach dealing with both voltage and current control. This approach allows the system to track a desired voltage using the maximum power point tracking (MPPT) algorithm while keeping the output current at a moderate level. The stability of the closed loop of the full system is demonstrated by means of Lyapunov theory. The simulation utilizes realistic PV array parameters obtained using particle swarm optimization (PSO) identification algorithm. Experimental results are also presented showing the good performance of the proposed controller.