Abstract：A control strategy for three-phase boost-type grid-connected inverter is proposed. The operation principle of the inverter is analyzed in detail. The output characteristics of the grid current are derived. The digital control system is based on digital signal processing (DSP) TMS320LF2407. The simulation and experimental results show that current-source grid connection with high power factor can be realized by single-stage boost DC/AC conversion. Moreover, the power frequency inductors in traditional current-source inverter are removed and only two switches are communicated at any time. Therefore, the proposed inverter has advantages of small volume, low cost, high efficiency, flexible control, high stability and high quality grid current based on the DSP control.
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2009, Vol. 24 
