基于IFOINC算法的光伏系统MPPT研究  

Research in MPPT of photovoltaic system based on IFOINC algorithm

作　　者：吴铁洲[1] 何淑婷[1] 王越洋[1] 戢理 李倩颖[1] 

机构地区：[1]湖北工业大学电气与电子工程学院太阳能高效利用湖北省协同创新中心,湖北武汉430068

出　　处：《可再生能源》2016年第9期1272-1279,共8页Renewable Energy Resources

基　　金：国家自然科学基金项目(51247004)

摘　　要：针对光伏系统传统的最大功率点跟踪(MPPT)算法跟踪速度慢、易振荡、跟踪精度低等不足,提出一种改进的分数阶电导增量(IFOINC)算法,即将基于功率预测的变步长扰动观察(P&O)算法和分数阶电导增量(FOINC)算法结合使用。IFOINC算法具体跟踪过程,先采用基于功率预测的变步长P&O算法快速跟踪到MPP附近,再采用FOINC算法进一步搜索MPP从而完成整个跟踪过程。文章研究了光伏系统结构,光伏电池的等效模型,设计了IFOINC算法,建立了光伏系统MPPT仿真模型,在Matlab/Simulink下进行仿真。在光照均匀的条件下,改变其它环境条件,研究IFOINC算法的MPP跟踪效果与基于功率预测的变步长P&O算法和FOINC算法之间的差异。研究结果表明,IFOINC算法的跟踪速度比FOINC算法提高了42.3%,IFOINC算法的跟踪精度比基于功率预测的变步长P&O算法提高了3.9%,且消除了跟踪过程的振荡。Aimed at the deficiencies of slow tracking speed, easy oscillation and low tracking precision of traditional maximum power point tracking （MPPT）algorithm in a photovohaic system, an improved fractional order incremental conductance （IFOINC）algorithm is proposed, which combines variable step size P＆O algorithm based on power prediction and fractional order incremental conductance （FOINC）algorithm, and firstly uses variable step size P＆O algorithm based on power prediction to track rapidly nearby MPP, and then uses FOINC algorithm to further search the MPP to complete the tracking procedure. The photovoltaic system structure, equivalent model of photovohaic cells are studied, IFOINC algorithm is designed, the simulation model of photovohaic system is established, and the simulation is carried out in Matlab/Simulink in this paper. The MPPT tracking effect differences of IFOINC algorithm with variable step size P＆O algorithm based on power prediction and FOINC algorithm are studied at uniform illumination with changed environmental condition. Research results show that as compared with FOINC algorithm, the tracking speed in using IFOINC algorithm is improved by 42.3%, and while as compared with variable step size P＆O algorithm based on power prediction, the tracking precision in using IFOINC algorithm is improved by 3.9% , and oscillation is eliminated.

关 键 词：光伏系统 MPPT IFOINC P&O MATLAB/SIMULINK 

分 类 号：TK513[动力工程及工程热物理—热能工程] TM615[电气工程—电力系统及自动化]