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Open AccessArticle

Impact of Partial Shading on the P-V Characteristics and the Maximum Power of a Photovoltaic String

1
Faculty of Engineering, Technology & Built Environment, UCSI University No. 1, Jalan Menara Gading, Kuala Lumpur 56000, Malaysia
2
Institute of Power Engineering, Department of Electrical Power Engineering, Universiti Tenaga Nasional, 43000 Kajang, Malaysia
3
UM Power Energy Dedicated Advanced Centre, University of Malaya, Jalan Pantai Baharu, Kuala Lumpur 59990, Malaysia
*
Author to whom correspondence should be addressed.
Energies 2018, 11(7), 1860; https://doi.org/10.3390/en11071860
Received: 1 June 2018 / Revised: 21 June 2018 / Accepted: 26 June 2018 / Published: 17 July 2018
A photovoltaic system is highly susceptible to partial shading. Based on the functionality of a photovoltaic system that relies on solar irradiance to generate electrical power, it is tacitly assumed that the maximum power of a partially shaded photovoltaic system always decreases as the shading heaviness increases. However, the literature has reported that this might not be the case. The maximum power of a partially shaded photovoltaic system under a fixed configuration and partial shading pattern can be highly insusceptible to shading heaviness when a certain critical point is met. This paper presents an investigation of the impact of partial shading and the critical point that reduce the susceptibility of shading heaviness. Photovoltaic string formed by series-connected photovoltaic modules is used in this research. The investigation of the P-V characteristic curve under different numbers of shaded modules and shading heaviness suggests that the photovoltaic string becomes insusceptible to shading heaviness when the shaded modules irradiance reaches a certain critical point. The critical point can vary based on the number of the shaded modules. The formulated equation in this research contributes to determining the critical point for different photovoltaic string sizes and numbers of shaded modules in the photovoltaic string. View Full-Text
Keywords: photovoltaic; partial shading; P-V characteristics; solar energy photovoltaic; partial shading; P-V characteristics; solar energy
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Teo, J.C.; Tan, R.H.G.; Mok, V.H.; Ramachandaramurthy, V.K.; Tan, C. Impact of Partial Shading on the P-V Characteristics and the Maximum Power of a Photovoltaic String. Energies 2018, 11, 1860.

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