In order to solve the problem of unstable operation and output power decreasing of photovoltaic（ PV）cells caused by partial shade due to leaves

buildings

clouds

etc

propose a maximum power point tracking（ MPPT） of the shading condition PV systems based on GPPSO

and use it for MPPT of the complex shading condition PV systems. Results show that double optimized algorithm effectively improves the local accurate searching and global convergence ability of optimization space

in the process of the optimal solving of objective function

precision and convergence speed are improved obviously

which can rapidly adapt to environmental shade changes

can accurately track the maximum power point in complicated environment

and improve efficiency of PV systems.