基于自适应变步长电阻增量法的最大功率点跟踪

发布时间：2018-04-26 06:22

本文选题：光伏发电 + 最大功率点跟踪　；参考：《华南理工大学学报(自然科学版)》2015年12期

【摘要】：为保证光伏系统在光照剧烈变化条件下仍可输出最大功率,提出一种自适应变步长电阻增量算法.该算法可根据外界环境的变化,通过步长转换函数自动将光伏系统工作区域划分为定步长区域和变步长区域:在定步长区域,基于短路电流和最大功率点电流的近似线性关系,提出一种整定初始定步长的方法;在变步长区域,结合步长转换函数与输出功率的关系,确定变步长控制策略的速度因子,保证了算法的收敛性.搭建光伏系统Matlab/Simulink仿真模型和基于DSP(TMS320F28035)控制的5 k W光伏系统实验平台,仿真和实验结果表明,所提算法在光照剧烈变化条件下可将光伏系统动态响应速度提高73%,并使得稳态跟踪精度达到98.9%.
[Abstract]:An adaptive variable step resistor increment algorithm is proposed to ensure the maximum output power of photovoltaic system under the condition of intense illumination variation. According to the change of external environment, the working area of photovoltaic system can be automatically divided into constant step size region and variable step size area by step size conversion function. In the fixed step size region, the approximate linear relationship between short circuit current and maximum power point current is based on the linear relationship between short circuit current and maximum power point current. In this paper, a method of setting initial fixed step size is proposed, and the speed factor of variable step size control strategy is determined in the variable step region, which ensures the convergence of the algorithm by combining the relationship between the step size conversion function and the output power. The simulation model of photovoltaic system Matlab/Simulink and the experimental platform of 5kW photovoltaic system based on DSP TMS320F28035) are built. The simulation and experimental results show that, The proposed algorithm can increase the dynamic response speed of photovoltaic system by 73 and make the steady-state tracking accuracy reach 98.9.
【作者单位】：华南理工大学电力学院;华南理工大学广东省绿色能源技术重点实验室;
【基金】：国家自然科学基金资助项目(51177050);国家自然科学基金青年基金资助项目(60904078)~~
【分类号】：TM615

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