光伏发电系统中的一种改进型扰动观察法  

An Improved Perturbation and Observation Method for PV Power System

作　　者：罗宏亮[1] 丘浩 李春涛[1] LUO Hong-liang QIU Hao LI Chun-tao(College of Electrical Engineering, Guangxi University, Nanning 530004, Chin)

机构地区：[1]广西大学电气工程学院,广西南宁530004

出　　处：《电气开关》2017年第4期11-14,共4页Electric Switchgear

基　　金：国家自然科学基金资助项目(51267001);广西科学研究与技术开发计划项目(14122006-29);广西自然科学基金资助项目(2014GXNSFAA118338)

摘　　要：本文针对扰动观察法中步长的选择不能同时兼顾跟踪速度与精度这个缺点,提出了一种具有快速定位功能的改进扰动观察法。改进的方法在对光伏发电系统进行最大功率跟踪时可分为"历史信息库的建立"、"粗跟踪"及"细跟踪"三个过程。"历史信息库的建立"实质为利用光伏电池的输出特性曲线得到任意温度、日照强度下电池的近似最大功率点电压;"粗跟踪"通过调节光伏系统前级的Boost变换器使电池输出电压达到近似最大功率点电压,从而使得输出功率快速达到最大功率附近;"细跟踪"实质为以极小步长扰动近似最大功率点电压,使光伏电池的输出功率趋于最大,极小的步长可有效减小由扰动引发的跟踪振荡。在Matlab/Simulink仿真平台下对所提的改进扰动观察法进行仿真验证,结果证明了该方法的有效性。Since the choice of step size in the perturbation and observation method could not consider tracking speed and accuracy, an improved PO method with fast positioning capability is proposed in this paper. The improved method of maximum power tracking is divided into three processes, establishment of historical information database, coarse tracking and fine tracking are included. According to the outp point voltage of cell under different temperature and ut characteristic curve of PV cell, the approximate maximum power sunlight intensity can be obtained in the first process;in the second process,the output voltage can achieve approximate maximum power point voltage by adjusting Boost converter, the out- put power can also achieve nearly maximum value ; in the process of fine tracking, the output power tends to be maximum by disturbing output voltage with a small step length, and the tracking oscillation caused by disturbance can be sup- pressed effectively for the very small step size. In the Matlab/Simulink simulation platform, the effectiveness of the pro- posed method is proved.

关 键 词：光伏发电系统 最大功率跟踪 BOOST变换器 改进的扰动观察法 

分 类 号：TM71[电气工程—电力系统及自动化]