摘要
基于传统变步长扰动观察法在步长调整的过程中存在过大和过小,从而无法兼顾跟踪精度和响应速度的问题,在扰动观察法的基础上提出一种自适应变步长扰动观察法,实现扰动步长的自动调整,再通过控制Boost升压电路占空比实现光伏系统的最大功率跟踪。并在MATLAB/SIMULINK软件中分别搭建基于传统的变步长扰动观察法与自适应变步长扰动观察法的模型进行仿真。通过对比表明,随着外界条件的变化时,所提方法极大地提高了对最大功率点的跟踪速度且减少了功率的波动,使光伏系统的发电效率得到很好的改善。
Based on the traditional variable step size perturbation observation method,there are too large and too small in the process of step adjustment,so that the tracking accuracy and response speed cannot be considered.Based on the perturbation observation method,an adaptive variable step perturbation observation method is proposed.The automatic adjustment of the disturbance step is realized,and the maximum power tracking of the photovoltaic system is realized by controlling the duty ratio of the boost voltage circuit.The model based on traditional variable step size perturbation observation method and adaptive variable step size perturbation observation method is built in MATLAB/SIMULINK software.The comparison shows that with the change of external conditions,the proposed method greatly improves the tracking speed of the maximum power point and reduces the fluctuation of power,so that the power generation efficiency of the photovoltaic system is improved.
作者
郑年伟
吉培荣
刘浩
刘婧珂
ZHENG Nianwei;JI Peirong;LIU Hao;LIU Jingke(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443000,China)
出处
《电力科学与工程》
2019年第9期9-14,共6页
Electric Power Science and Engineering
关键词
自适应变步长
扰动观察法
最大功率跟踪
光伏系统
adaptive variable step size
disturbance observation method
maximum power tracking
photovoltaic system
