A comparison of different global MPPT techniques based on meta-heuristic algorithms for photovoltaic system subjected to partial shading conditions

Rezk, Hegazy; Fathy, Ahmed; Abdelaziz, Almoataz Y.

doi:10.1016/j.rser.2017.02.051

Cited by 209 publications

(85 citation statements)

References 37 publications

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Section: Introductionmentioning

confidence: 99%

“…Figure 3 shows the P-V characteristics of a photovoltaic string during a partial shading condition. The highest peak is the global peak which represents the maximum power of the photovoltaic string, while the others are the local peaks [24,25]. Apparently, a photovoltaic system is highly susceptible to partial shading [26][27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…It was the most frequent state in which the inverters can be found. In it, the inverters ensure that the modules are in their optimum operating point for each external conditions, thus trying to extract the maximum power output of PV systems [39,78,79]. It can be observed that, except in the initial and final hours of the day, inverters were usually working in this state.…”

Section: Inverter Statesmentioning

confidence: 99%

Graphical Diagnosis of Performances in Photovoltaic Systems: A Case Study in Southern Spain

et al. 2017

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Abstract:The starting point of the operation and maintenance tasks in photovoltaic plants is the continuous monitoring and supervision of its components. The great amount of registered data requires a major improvement in the ways this information is processed and analyzed to rapidly detect any potential fault, without incurring additional costs. In this paper, a procedure to perform a detailed graphical supported analysis of the operation of photovoltaic installations, based on inverter data, and using a self-developed application, is presented. The program carries out the automated processing of the registered data, providing their access and visualization by means of color maps. These graphs allow a large volume of data set to be simultaneously represented in a readable way, enabling operation and maintenance operators to quickly detect patterns that would require any type of intervention. As a case study, the operation of a grid-connected photovoltaic plant located in southern Spain was studied during a period of three years. The average daily efficiency values of the PV modules and inverters were in the range of 7.6-14.6%, and 73.5-94% respectively. Moreover, the presence of shadings, as well as the hours and days mainly affected by this issue, was easily detected.

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“…11 Such diodes have no influence under normal conditions. These algorithms comprise flower pollination algorithm, 16 teaching-learningbased optimization, 17 Cuckoo search (CS), 18 moth-flame optimization, 19 mine blast optimization, 20 particle swarm optimization (PSO), 21 differential evolution, 22 Jaya algorithm, 23 grey wolf optimizer, 24 sine cosine algorithm (SCA), 25 and shuffled frog leap algorithm. This issue causes power versus voltage graph of the PVS during shadowing condition that contain some local MPPs and single global point.…”

Section: Introductionmentioning

confidence: 99%

An efficient single‐sensor global maximum power point tracking method for partially shaded photovoltaic battery chargers

Rezk

2019

Int J Energy Res

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SUMMARY Solar energy and other renewables like geothermal, biomass, and wind energy can minimize the release of the CO2 and other harmful gases produced in case of fossil fuel. Low efficiency is the main drawback of the solar photovoltaic system specifically under partial shadowing condition (PSC). Commonly, with uniform solar radiation distribution, the power‐voltage graph has single maximum power point (MPP). The single MPP can be definitely extracted by any traditional tracker like perturb and observe as an example. However, during PSC, the situation is completely different since the power‐voltage curve has many MPPs (ie, multiple local points and single global point). The conventional MPP tracking methods cannot discriminate among local peaks and global peak; consequently, they can be easily trapped on the first local peak. Therefore, smart MPPTs based on modern optimization are required to track the global MPP. Most of MPPT tracking methods in the literature require both voltage and current sensors, and sometimes the control system needs an additional solar irradiance sensor and/or temperature sensor, which increase the system cost. In this paper, for the first time, a simple single‐sensor–based global MPP tracking method for partially shaded photovoltaic battery chargers is proposed. A deterministic particle swarm optimizer is utilized to extract the global MPP. Several patterns of PSC are considered to test and evaluate the proposed strategy. The obtained results confirm the efficacy of a single‐sensor–based global MPP tracking method to catch the global MPP accurately. Considering this research reduces the number of sensors, cost, and difficulty and consequently increases the power density of the MPP tracking methods under partial shadowing conditions.

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A comparison of different global MPPT techniques based on meta-heuristic algorithms for photovoltaic system subjected to partial shading conditions

Cited by 209 publications

References 37 publications

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

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

Graphical Diagnosis of Performances in Photovoltaic Systems: A Case Study in Southern Spain

An efficient single‐sensor global maximum power point tracking method for partially shaded photovoltaic battery chargers

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