Design of three-phase photovoltaic grid-connected inverter based on DSP

Abstract

Grid-connected photovoltaic (PV) system is the development trend of photovoltaic systems. According to the grid-connected PV system characteristics, this paper presents the design of a three-phase photovoltaic grid-connected inverter based on the digital signal processor (DSP) TMS320F28016. The hardware circuit is designed and the main parameters of device are calculated. Using space vector pulse width modulation algorithm (SVPWM) and designing the algorithm of software control flow chart. The experimental results show that the proposed scheme has very good dynamic and static properties, and the wave of grid-connected current has the same frequency and phase as the grid voltage, meanwhile, highly accurate steady output and less harmonic disturbance is gained.