基于分离式MPPT技术的BAPV并网电站优化设计与实验研究

Optimized Design and Experiment Research on BAPV Grid-connected Plant Based on Separated MPPT Technology

针对集中式MPPT光伏发电系统的不足,本文提出了分离式MPPT光伏发电技术,并将其应用于实际的BAPV系统设计中。详细阐述了分离式MPPT技术提高发电量的原理,给出了电池板的电气接线图。用Matlab软件建立了光伏电池组件和光伏阵列的Bishop仿真模型,得到了不同遮挡情况下阵列输出的U-P和U-I特性曲线,并比较了在不同遮挡情况下分离式MPPT与集中式MPPT系统的输出功率。选取两个建筑光伏阵列进行了对比实验,得到了阴影遮挡时间内的发电功率曲线和全天的发电功率曲线。实验结果表明:分离式MPPT光伏发电系统的日发电量比集中式MPPT光伏发电系统提高了8.45%,经过连续4个月的发电量统计得到分离式单元将发电量提高了6.48%。

For the deficiency of the centralized MPPT photovoltaic power generation system, a separated MPPT photovoltaic technology is put forward and applied to the BAPV system design of a building. The principle of the separated MPPT technology is elaborated detailed and the electric diagrams of panels are given. The Bishop model of photovoltaic cell and photovoltaic array are built up. U-P and U-I characteristics curves of array under different sheltering are obtained. And the output power of separated MPPT photovoltaic system is compared with that of centralized MPPT photovoltaic system under different sheltering. Two photovoltaic arrays on the building are selected to do contrasting experiments. The power curves in the shade shielding time and in the whole day are obtained. The experimental results show that the daily generation power of the separated MPPT photovoltaie system is increased by 8.45% compared with that of the centralized MPPT photovoltaic system. Through the statistics of four consecutive months, the whole generation power of the separated MPPT unit is increased by 6.48%.