Research And Development On Dsp-based Photovoltaic Grid-connected Inverter

Nowadays, green energy such as wind, solar and tidal energy have been developing greatly because of energy crisis. Solar energy technology and applications are given more attention under industrial policy. Grid-connected photovoltaic (PV) system is an important area of solar energy applications. It not only supply a shortage of electricity in remote areas, but also relieve the power shortage situation in the city. So, grid-connected photovoltaic technology is the main direction of future development.The paper firstly introduced the present condition of photovoltaic synchronization power generation and then presented the working principle, topology structure and control algorithm of photovoltaic synchronization power generation. It emphasized on the analysis of how to realize the control algorithm of voltage space-vector.On the aspect of individual power supply of inverter, single phase inverter was developed for local load power supply adopting the analogous circuit to control SPWM. It provided a simple and reliable plan for the small volume local load power supply.On the aspect of synchronization inverter, the paper described the design process of photovoltaic system in detail. As to the maximum power point tracking, the stabilized voltage supply was adopted on the said of direct current because of no suitable characteristic curve of photovoltaic output. So the paper emphasized on introduction of the working principle and strategy control.Finally,the author develop a DSP28016-based three-phase inverter in the laboratory based on theoretical analysis and design specification above. The result of test experiment show that the system can correctly implement the SVPWM control algorithm, and the grid current can keep the pace with grid voltage. The grid fault(island effect) also can be identified and then disconnected the inverter with the grid. The whole system meets the requirement of security, reliable operation.