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An Improved Incremental Conductance Method for MPPT Control of PV Systems under Partially Shaded Conditions

  • CHEN Ling-yu ,
  • HUANG Lei ,
  • ZHANG Ji-yuan ,
  • WANG Hao ,
  • CUI Qiong ,
  • SHU Jie
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  • 1. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
    2. School of Electric Power, South China University of Technology, Guangzhou 510640, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2016-10-21

  Revised date: 2016-11-30

  Online published: 2016-12-28

Abstract

Under partially shaded conditions, traditional maximum power point tracking (MPPT) methods may be trapped in local maximum power point due to the multiple peaks of PV array output caused by different output characteristics of series-connected PV modules. This paper proposes an improved incremental conductance method for two-level grid-connected PV system under partially shaded conditions. By analyzing the variation range of maximum power point voltage, voltage searching range is set to improve searching efficiency. And the voltage is controlled by the duty cycle of DC/DC boost converter. The proposed method can search out every local maximum power point and ensure PV system working at global maximum power point. Simulation results confirm that the proposed method can find out maximum power point under partially shaded or unshaded conditions, and improve the PV generation efficiency significantly.

Cite this article

CHEN Ling-yu , HUANG Lei , ZHANG Ji-yuan , WANG Hao , CUI Qiong , SHU Jie . An Improved Incremental Conductance Method for MPPT Control of PV Systems under Partially Shaded Conditions[J]. Advances in New and Renewable Energy, 2016 , 4(6) : 486 -491 . DOI: 10.3969/j.issn.2095-560X.2016.06.009

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