A PV inverter Grid-Connected system based on SVPWM is designed here, which is consisted of DC/DC circuit, TMS320F2812 , optical isolating circuit and driver circuit, three-phase inverter bridge, Grid signal acquisition circuit. Besides,program of the system is built with CCS3.3. SVPWM, MPPT, Grid-Connected, control comes true with the help of C language. Improved variable step size perturbation and observation method is applied in MPPT, which saves time of searching maximum power point and avoids oscillation generated. The experimental results show that the system can not only meet the design requirements, the Grid-Connect effect is also ideal.

An embedded PV inverter Grid-Connected system based on STM32F103 whose main program is built with Keil uVision4 is designed here, which is consisted of control core unit, SPWM wave modulating unit, dead-band and optical isolating unit，IR2110 driver unit, three-phase inverter unit, RC filter unit, Grid signal acquisition unit and LCD320x240 unit. The dead time of the designed dead-band unit is adjustable, which can effectively prevent inverter subversion. The experimental results show that the system can not only meet the design requirements, but also make the Grid-Connected effect ideal.