基于DSP控制的单相光伏并网逆变系统的设计

Design of single phase photovoltaic grid-connected inverse system based on DSP

阐述了基于数字信号处理器TMS320F2812控制的单相光伏并网逆变系统的设计,该系统主要应用于小功率光伏并网发电系统。分析了系统的结构和控制原理,设计了最大功率跟踪MPPT(Maximum power point tracking)算法和锁相环的软件设计流程图,构建了实验室样机。实验结果表明并网电流波形良好,但含有少量的高次谐波,逆变器输出的电流基本与电网电压同频同相,并网的功率因数近似为1。

This paper presents the design of single phase photovoltaic grid-connected inverse system based on the digital signal processor TMS320F2812 .The system mainly has application in the small power photovoltatic grid-connected generation system. The paper analyzes the constitute and control principle of the system and designs the software flow chart of MPPT（Maximum Power Point Tracking） algorithm and the phase lock loop. An experimental prototype is built up. The experimental results show the wave of grid-connected current is better except for a little amount high-order harmonical wave. The wave of grid-connected current has the same frequency and phase as the utility voltage. The power factor of grid-connected has reached to nearly 1.