Efficient global maximum power point tracking technique for a partially shaded photovoltaic string

Chakkarapani Manickam; Guru Praanesh Raman; Guru Raghav Raman; Saravana Ilango Ganesan; Nagamani Chilakapati

Efficient global maximum power point tracking technique for a partially shaded photovoltaic string

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Author(s): Chakkarapani Manickam ¹ ; Guru Praanesh Raman ¹ ; Guru Raghav Raman ¹ ; Saravana Ilango Ganesan ¹ ; Nagamani Chilakapati ¹
- Affiliations: 1: Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirappalli-620015, India
Source: Volume 9, Issue 14, 16 November 2016, p. 2637 – 2644
DOI: 10.1049/iet-pel.2015.1040 , Print ISSN 1755-4535, Online ISSN 1755-4543

Received 25/12/2015, Accepted 27/06/2016, Revised 03/06/2016, Published 16/11/2016

Maximum power point tracking (MPPT) is essential for a photovoltaic (PV) system in order to maximise the utilisation of solar energy. Under partially shaded conditions (PSC), PV strings with bypass diodes exhibit multiple peaks in the power–voltage (P–V) characteristics. Although various Global MPPT (GMPPT) algorithms have been proposed to address this issue, most of them cannot distinguish between PSC and uniform insolation, leading to the scan of the entire P–V curve under uniform insolation levels. This study introduces a general method to detect the occurrence of PSC in a PV string thereby dispensing the need to scan the entire PV curve under uniform insolation. Further, a simple technique is proposed to determine the GMPP with the minimum possible search space under PSC. The proposed algorithms for the detection of partial shading and GMPPT are validated experimentally.

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Efficient global maximum power point tracking technique for a partially shaded photovoltaic string

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