基于分离式MPPT技术的BAPV并网电站优化设计与实验研究
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摘要
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 photovoltaic 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%.
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 photovoltaic 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%.
引文
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[13]MEYER E L,ERNEST VAN DYK E.Assessing the reliability and degradation of photovoltaic module performance parameters[J].IEEE Transactions on Reliability,2004,53(1):83-92.
[14]JABOORI M G,HANAFY S M.A contribution to the simulation and design optimization of photovoltaic systems[J].IEEE Transactions on Energy Conversion,1991,6(3):401-406.
[2]CARRASCO J M,FRANQUELO L G,BIALASIEWICZ J T,et al.Power-electronic systems for the gridintegration of renewable energy sources:a survey[J].IEEE Trans.Industrial Electronics,2006,53(4):1002-1016.
[3]胡寅.太阳能发电系统相关技术方案设计[J].上海建设科技,2009(1):12-15.
[4]Ralf Muenster.电源优化器技术:集中式与分布式MPPT的分析和比较[J].电子设计应用,2009(9):63-64.
[5]陈剑,赵争鸣,袁立强,等.光伏系统最大功率点跟踪技术的比较[J].清华大学学报(自然科学版),2010,50(5):700-704.
[6]周德佳,赵争鸣,袁立强,等.具有改进最大功率跟踪算法的光伏并网控制系统及其实现[J].中国电机工程学报,2008,28(5):94-100.
[7]贺凡波,赵争鸣,袁立强.一种基于优化算法的光伏系统MPPT方法[J].电力电子技术,2009,43(10):11-13.
[8]唐峰.两种形式太阳能并网逆变电源发电效率的研究[J].电源世界,2010(8):46-48.
[9]时剑,刘俊,刘凯,等.中大功率组合型逆变器的优势[J].中国建设动态:阳光能源,2011(2):68-69.
[10]Michele Sclocchi.分布式MPPT提高太阳能光伏系统的效率[J].集成电路应用,2009(12):40-41.
[11]ALONSO-GARCIAA M C,RUIZB J M,CHENLO F.Experimental study of mismatch and shading effects in the I-V characteristic of a photovoltaic module[J].Solar Energy Materials&Solar Cells,2006,90(3):329-340.
[12]ALONSO-GARCIAA M C,RUIZB J M.Analysis and modeling the reverse characteristic of photovoltaic cells[J].Solar Energy Materials&Solar Cells,2006,90(10):1105-1120.
[13]MEYER E L,ERNEST VAN DYK E.Assessing the reliability and degradation of photovoltaic module performance parameters[J].IEEE Transactions on Reliability,2004,53(1):83-92.
[14]JABOORI M G,HANAFY S M.A contribution to the simulation and design optimization of photovoltaic systems[J].IEEE Transactions on Energy Conversion,1991,6(3):401-406.