小功率太阳能电源逆变装置的设计

Design of the Inversion Device for the Mini-types Solar Power Supply

以TMS320LF2407型DSP为核心,采用两级结构设计了小功率太阳能电源逆变装置。前级为升压斩波器,用于实现最大功率跟踪(MPPT);后级为全桥式逆变器,用于实现对并网电流的控制。针对传统PI控制的不足,采用了PI控制和重复控制相结合的控制策略,以实现并网电流与电网电压可靠同步。实验证明,所设计的逆变装置具有良好的稳定性和可靠的控制策略,可广泛用于家庭、单位或社区里的光伏电源系统。

The inversion device of the mini-types solar power supply is realized by two stage-frames, based on the technology of the digital signal processor and the TMS320LF2407.The front stage is the Boost chopping circuit to realize the maximum power point tracking （MPPT）, the later stage is the full bridge inverter to realize the grid-connected current control. Aiming at the shortcoming of PI control, a strategy which combines PI control and repetitive control is adopted to synchronize the utility voltage with the grid current credibly.Experiments show the inversion device has good stability and reliable control strategy, thus it is widely applied to the mini-types solar power supply in the home, unit and community.