Current control of constant hysteresis band for single phase photovoltaic grid-connected inverter

grid-connected inverter is a key electrical element for solar photovoltaic grid-connected electricity generation.Based on the simulation platform of Matlab/simulink,the mathematical models and simulation modules of photovoltaic array and MPPT(maximum power point tracking) are built in this paper,the electrical characteristic of photovoltaic module is studied and the maximum power point dynamic tracking is accomplished as well,in addition,the grid-connected inverter system models with the integration of photovoltaic module and MPPT controller and the scheme of current hysteresis band control are presented.The simulation result indicates that the photovoltaic mathematical model and the algorithm of MPPT are valid,the dynamic response of grid-connected inverter which affected by climate condition change is simulated,which reveals the current hysteresis band control scheme applied in the photovoltaic grid-connected inverter can improve the grid's power quality,with the result of unity of power factor for power grid.