MPPT control of solar energy collecting circuit based on state estimation of solar cells

In order to maximize the power output efficiency of Solar cells and the solar energy collection efficiency of collecting circuit, it is needed to track the real-time status of Solar cells, and force solar cells to work at its MPPT working point by an appropriate control method. Aiming at the solar energy collecting circuit based on Boost structure DC/DC converter, a MPPT control method based on the state estimation of Solar cells (MPPT-SE) is presented. In the MPPT-SE control method, the MPPT current value of solar cells is estimated by detecting solar cells' output status and estimating its internal equivalent state, and the actual output current of solar cells is controlled to track its MPPT current value by current closed-loop control, this can force solar cells to work near its MPPT working point and maximize the power output efficiency of Solar cells and the solar energy collection efficiency of collecting circuit. The theoretical analysis and experiment results validate that the solar energy collecting circuit based on MPPT-SE method has higher power output efficiency and solar energy collection efficiency.