东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (8): 1065-1069.DOI: 10.12068/j.issn.1005-3026.2015.08.001

• 信息与控制 •    下一篇

一种VWP分段模糊控制的光伏系统MPPT方法

李绍武, 高宪文, 冯玉昌   

  1. (东北大学 信息科学与工程学院, 辽宁 沈阳110819)
  • 收稿日期:2014-05-08 修回日期:2014-05-08 出版日期:2015-08-15 发布日期:2015-08-28
  • 通讯作者: 李绍武
  • 作者简介:李绍武(1979-),男,湖北恩施人,东北大学博士研究生; 高宪文(1955-),男,辽宁盘锦人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(61034005).

A VWP-Section Fuzzy MPPT Method for PV Systems

LI Shao-wu, GAO Xian-wen, FENG Yu-chang   

  1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2014-05-08 Revised:2014-05-08 Online:2015-08-15 Published:2015-08-28
  • Contact: GAO Xian-wen
  • About author:-
  • Supported by:
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摘要: 当天气情况快速变化时,如何同时优化光伏(photovoltaic, PV)系统在最大功率跟踪(maximum power point tracking, MPPT)控制中的快速性、准确性和平稳性目前仍是一个难题.针对这一问题,提出了一种可变天气参数(variable weather parameter,VWP)分段模糊MPPT方法.该方法采用两条VWP直线将输出功率曲线分为三个跟踪区域,每个区域采用一个模糊控制器进行控制,其总体控制决策为:在控制量远离理想最大功率点(maximum power point, MPP)时采用大步长以确保跟踪的快速性,在控制量接近MPP时采用小步长以确保跟踪的准确性和平稳性.仿真实验证明,该控制方法比传统扰动观察法具有更好的快速性、准确性和平稳性.

关键词: 光伏系统, 模糊控制, 最大功率跟踪, 可变天气参数, 分段控制

Abstract: It is difficult to simultaneously optimize the maximum power point tracking (MPPT) of the photovoltaic (PV) systems under the criteria of rapidity, accuracy and placidity, when the weather varies quickly. Aimed at solving this problem, a fuzzy MPPT method combined with variable weather parameters (VWP) is proposed. In this method, the power curve of the output signal is divided into three sections by the two VWP straight lines and each section has one fuzzy controller for tracking control. The overall control strategy is that a big tracking step-size is selected to ensure the MPPT rapidity when the control signal is far from its ideal value at maximum power point (MPP), while a small tracking step-size is used to ensure the MPPT accuracy and placidity. Simulation experiments verify that the method proposed outperforms the conventional perturbation and observasion (P & O) method in rapidity, accuracy and placidity.

Key words: PV generation system, fuzzy logic control, maximum power point tracking (MPPT);variable weather parameter (VWP), sectional control

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