快速变步长光伏电池最大功率点跟踪方法  

Rapid Variable Step Tracking of Maximum Power Point for Photovoltaic Cell

作　　者：周丽红[1] 安雪娥 徐江海[1] 王海燕[1] ZHOU Lihong;AN Xue ＇e;XU Jianghai;WANG Haiyan(School of Electronic Engineering, Huai＇ an Vocational College of Information Technology, Huai＇ an 223003, Jiangsu, China;School of Information Science Technology, East China Normal University, Shanghai 200062, China)

机构地区：[1]淮安信息职业技术学院电子工程学院,江苏淮安223003 [2]华东师范大学信息科学技术学院,上海200062

出　　处：《实验室研究与探索》2018年第3期37-41,共5页Research and Exploration In Laboratory

基　　金：淮安市科技支撑计划重点项目(HAG2015054)

摘　　要：光伏系统最大功率点跟踪的传统方法涉及步长和周期的选取,而变步长算法需依赖系统参数等条件,影响系统的跟踪响应速度以及稳定性。为了进一步加快最大功率点的搜索速度同时降低稳态时功率输出振荡,提出一种新型快速变步长搜索算法。此算法通过定义虚拟负载线并结合I-U曲线实现最大功率点的定向跟踪,可以在数个运算周期将工作点锁定在最大功率点附近。再通过对容许误差的定义,实现了稳态时输出功率无振荡。实验证明了所提算法能够显著提高搜索速度并保证了输出的稳定性,适应不同外部环境的快速变化。Traditional methods used in photovoltaic maximum power point tracking system involve selecting step and cycle track, and the variable step algorithm relies on the system parameters and other conditions, and also affects the stability of the system. To further accelerate the search of the maximum power point and reduce the steady-state power output oscillation, a novel variable step fast search algorithm is proposed. This algorithm tracks the maximum power point by defining a virtual line and load combination I - U curve, within several operational cycles it will be locked near the maximum power point. Then by definition of tolerance a steady-state power output is achieved without oscillation. Experimental results show that the proposed algorithm can provide significant search speed and ensure the stability of the output, adapt to rapid changes in different external environment.

关 键 词：光伏电池 最大功率点跟踪 快速变步长 

分 类 号：TM914.4[电气工程—电力电子与电力传动]