基于等效负载阻抗扰动的分布式MPPT方法研究  

A distributed maximum power point tracking method based on the equivalent load impedance disturbance

作　　者：黄建明[1] 吴春华[1] 徐坤[1] 付立[1] 

机构地区：[1]上海大学自动化系,上海市电站自动化技术重点实验室,上海200072

出　　处：《电力系统保护与控制》2012年第24期125-130,共6页Power System Protection and Control

基　　金：国家自然科学基金(51107079);上海大学'十一五'211建设项目资助~~

摘　　要：介绍了光伏优化器系统的工作原理及最大功率点跟踪的本质。针对光伏优化器系统中每块光伏组件进行MPPT控制,造成传统MPPT方法由于负载阻抗扰动而引起误判断的问题,提出了一种基于等效负载阻抗扰动的分布式最大功率点跟踪方法。该方法综合考虑控制量扰动和负载阻抗扰动进行MPPT判断,避免光伏优化器系统中各个独立模块之间的相互影响。通过对比实验证明提出的基于等效负载阻抗扰动的最大功率点跟踪方法具有快速的响应能力及抗负载阻抗扰动能力,其稳定性优于传统的MPPT方法。The operation principle of photovoltaic optimizer system and the essence of maximum power point tracking （MPPT） are introduced. Each PV module adopts MPPT control algorithm in photovoltaic optimizer system, which leads to wrong judgment of the traditional MPPT method due to the load impedance perturbation. Based on the equivalent load impedance perturbation, the distributed maximum power point tracking （DMPPT） is proposed to solve the problem. Considering the disturbance of control variables and load impedance to track MPP, the interaction between individual modules in the photovoltaic optimizer system is avoided. Finally, comparative experiments prove that the DMPPT method based on the equivalent load impedance perturbation proposed in this paper has the advantage of quick response and perturbation resistance to load impedance. Furthermore, the stability of this method is better than conventional MPPT method.

关 键 词：光伏优化器 等效负载阻抗 最大功率点跟踪 

分 类 号：TM615[电气工程—电力系统及自动化]