Thermography-Based Virtual MPPT Scheme for Improving PV Energy Efficiency Under Partial Shading Conditions

被引:87
作者
Hu, Yihua [1 ]
Cao, Wenping [2 ]
Wu, Jiande [3 ]
Ji, Bing [4 ]
Holliday, Derrick [5 ]
机构
[1] Univ Strathclyde, Dept Elect Engn, Glasgow G1 1XQ, Lanark, Scotland
[2] Queens Univ Belfast, Sch Elect Elect Engn & Comp Sci, Belfast BT9 5AH, Antrim, North Ireland
[3] Zhejiang Univ, Coll Elect Engn, Hangzhou 310058, Zhejiang, Peoples R China
[4] Newcastle Univ, Sch Elect & Elect Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[5] Univ Strathclyde, Dept Elect & Elect Engn, Glasgow G1 1XW, Lanark, Scotland
基金
中国国家自然科学基金; 英国工程与自然科学研究理事会;
关键词
Fault diagnosis; maximum power point tracking (MPPT); partial shading; photovoltaics (PVs); thermography; SYSTEMS;
D O I
10.1109/TPEL.2014.2325062
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper proposes a new thermography-based maximum power point tracking (MPPT) scheme to address photovoltaic (PV) partial shading faults. Solar power generation utilizes a large number of PV cells connected in series and in parallel in an array, and that are physically distributed across a large field. When a PV module is faulted or partial shading occurs, the PV system sees a nonuniform distribution of generated electrical power and thermal profile, and the generation of multiple maximum power points (MPPs). If left untreated, this reduces the overall power generation and severe faults may propagate, resulting in damage to the system. In this paper, a thermal camera is employed for fault detection and a new MPPT scheme is developed to alter the operating point to match an optimized MPP. Extensive data mining is conducted on the images from the thermal camera in order to locate global MPPs. Based on this, a virtual MPPT is set out to find the global MPP. This can reduce MPPT time and be used to calculate the MPP reference voltage. Finally, the proposed methodology is experimentally implemented and validated by tests on a 600-W PV array.
引用
收藏
页码:5667 / 5672
页数:6
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