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

Teo, J.C. and Tan, Rodney H.G. and Mok, V.H. and Ramachandaramurthy, Vigna K. and Tan, Chia Kwang (2018) Impact of Partial Shading on the P-V Characteristics and the Maximum Power of a Photovoltaic String. Energies, 11 (7). p. 1860. ISSN 1996-1073

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Official URL: https://doi.org/10.3390/en11071860

Abstract

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.

Item Type: Article
Uncontrolled Keywords: photovoltaic; partial shading; P-V characteristics; solar energy
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 26 Feb 2019 03:39
Last Modified: 26 Feb 2019 03:39
URI: http://eprints.um.edu.my/id/eprint/20491

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