In order to speed up the dynamic response of quasi-Z source photovoltaic grid-connected inverter

and to avoid the shortcomings of grid voltage vector-oriented control strategy which have to adopt decoupling control and multiple coordinate transformation

and to improve the adaptive range of grid connected current controller to grid frequency deviation

we introduced power feed-forward and quasi-PR control to the quasi-Z source grid-connected photovoltaic system.The complete control strategy of the grid connected system was designed by combining the power feed-forward

quasi-proportional resonant control strategy

and the shoot through segment SVPWM.Moreover

a simulation model of system was established and compared with the traditional control in Matlab/Simulink software.The simulation results show that the quasi-PR control strategy with power feed-forward can make the system transfer to another steady state quickly when the external environment changes and achieve no-static-error tracking of a given value in the stationary coordinate

meanwhile

the system is capable of resisting network frequency deviation.