局部阴影条件下光伏发电MPPT的研究  

Study on MPPT of Photovoltaic Power Generation under Partially Shaded Condition

作　　者：孙成正[1] 朱孝立[1] 赵春柳[1] 

机构地区：[1]安徽财贸职业学院,安徽合肥230601

出　　处：《青岛大学学报（工程技术版）》2017年第2期81-85,101,共6页Journal of Qingdao University(Engineering & Technology Edition)

基　　金：安徽省高等学校自然科学基金重点项目(KJ2014A007)

摘　　要：针对光伏发电系统传统的最大功率点跟踪算法在局部阴影下发生算法失效、功率损失较大以及无法准确找到最大功率点等问题。通过局部阴影下光伏阵列的理论分析,在Matlab/Simulink环境下搭建3.5kW单级式光伏并网逆变器仿真模型,并基于粒子群算法的全局最大功率点跟踪控制策略,对局部阴影遮蔽下的光伏阵列进行最大功率点跟踪,采用Matlab/Simulink仿真软件,对局部阴影条件下光伏阵列MPPT进行仿真研究。仿真结果表明,当不均匀光照发生时,光伏阵列输出功率曲线存在若干个局部最大功率点LMPP1、LMPP2、LMPP3,随着不均匀光照对象的增加,功率曲线的"阶梯状"越来越明显,光伏阵列特性受其影响越来越大。因此,该控制策略能够快速准确地实现均匀光照和不均匀光照条件下的光伏阵列最大功率点跟踪,有效地提高了光伏发电效率和实际应用水平。The traditional maximum power point tracking algorithm of photovoltaic system under partially shade conditions, has the problems of the algorithm failure, power loss and cannot find the maximum power point ac-curately. After theory analysis of the PV array under local shadow, we build 3. 5 kW simulation model of single stage photovoltaic grid connected inverter in matlab/Simulink environment, and maximum power point tracking for photovoltaic array under partially shaded conditions, which based on power point tracking control strategy of the particle swarm algorithm global maximum, using Matlab/Simulink, the photovoltaic array MPPT was studied under partially shade conditions. The simulation results show that the power curve of PV array have many local maximum power points LMPP1, LMPP2 and LMPP3 when uneven illumination occurs, with the in-crease of uneven illumination, the “ladder” of power curve is more and more obvious, the characteristics of photovoltaic array is affected more and more. Therefore, the control strategy can quickly and accurately achievethe maximum power point tracking of photovoltaic array under uniform illumination and non - uniform illumina-tion, and effectively improve the efficiency of photovoltaic power generation and practical application.

关 键 词：光伏发电 不均匀光照 模型 粒子群算法 局部阴影 全局最大功率点跟踪 

分 类 号：TM615[电气工程—电力系统及自动化]