Analytical Modeling of Partially Shaded Photovoltaic Systems

Seyedmahmoudian, Mehdi; Mekhilef, Saad; Rahmani, Rasoul; Yusof, Rubiyah; Renani, Ehsan Taslimi

doi:10.3390/en6010128

Cited by 166 publications

(102 citation statements)

References 25 publications

(35 reference statements)

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“…Power ( The consequence of partial shading conditions on PV systems has been extensively studied in the recent studies [37,38]. The emergence of multiple peaks on the output characteristic curve of PV systems adversely affects the functionality of common MPPT approaches.…”

Section: Characteristics Of Photovoltaic Systemsmentioning

confidence: 99%

“…The number of particles is elective and depends on the user; however, the number of dimensions depends of the number of variables which need to be optimized. The location of particles is determined in the matrix given in Equation (3): The consequence of partial shading conditions on PV systems has been extensively studied in the recent studies [37,38]. The emergence of multiple peaks on the output characteristic curve of PV systems adversely affects the functionality of common MPPT approaches.…”

Section: Theorymentioning

confidence: 99%

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Efficient Photovoltaic System Maximum Power Point Tracking Using a New Technique

et al. 2016

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Abstract:Partial shading is an unavoidable condition which significantly reduces the efficiency and stability of a photovoltaic (PV) system. When partial shading occurs the system has multiple-peak output power characteristics. In order to track the global maximum power point (GMPP) within an appropriate period a reliable technique is required. Conventional techniques such as hill climbing and perturbation and observation (P&O) are inadequate in tracking the GMPP subject to this condition resulting in a dramatic reduction in the efficiency of the PV system. Recent artificial intelligence methods have been proposed, however they have a higher computational cost, slower processing time and increased oscillations which results in further instability at the output of the PV system. This paper proposes a fast and efficient technique based on Radial Movement Optimization (RMO) for detecting the GMPP under partial shading conditions. The paper begins with a brief description of the behavior of PV systems under partial shading conditions followed by the introduction of the new RMO-based technique for GMPP tracking. Finally, results are presented to demonstration the performance of the proposed technique under different partial shading conditions. The results are compared with those of the PSO method, one of the most widely used methods in the literature. Four factors, namely convergence speed, efficiency (power loss reduction), stability (oscillation reduction) and computational cost, are considered in the comparison with the PSO technique.

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Section: Characteristics Of Photovoltaic Systemsmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Efficient Photovoltaic System Maximum Power Point Tracking Using a New Technique

et al. 2016

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“…Thanks to the MPPT (maximum power point tracker) algorithm, PV inverters are controlled in a way that keep the DC voltage almost constant, as the MPP (maximum power point) voltages do not vary by very much [45]. The storage inverters, on the other hand, are characterized by a sensitive variation of the voltage on the battery; thus, they need a dedicated control of the voltage obtained by the insertion of a DC/DC bi-directional (buck-boost) chopper.…”

Section: Dc/dc Converter Modelmentioning

confidence: 99%

A Simplified Microgrid Model for the Validation of Islanded Control Logics

et al. 2017

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Microgrids (MGs) may represent a solution in the near future to many problems in the energy and electric world scenarios; such as pollution, high reliability, efficiency and so on. In particular, MGs' capability to work in an islanded configuration represents one of their most interesting features in terms of the improvement of the reliability of the system, the integration of renewable energy sources and the exploitation of the quick response and flexibility of power electronic devices in a stand-alone system. In order to study and validate innovative solutions and control strategies for islanded operation, there is a need to develop models for MG structures that can be reliable and sufficiently simple to be used for the purpose of the design and validation of innovative control systems. This paper proposes a simplified, first harmonic model for a generic structure of MG characterized by its use of only electronic power converter interfaced generation. The main advantages of the proposed method lie in the model's simplicity and its reduced solving time, thanks to the limited number of necessary parameters to describe the system. Moreover, the developed formulation allows the avoidance of specific (and often licensed) software to simulate the system. The performances of the proposed model have been validated by means of a comparative analysis of the results obtained against a more accurate representation of the system performed in the power system CAD-electromagnetic transient and DC (PSCAD-EMTDC) environment, which allows for the representation of each component with a very high level of detail. Such comparison has been performed using the University of Genoa Savona Campus Smart Polygeneration Microgrid testbed facility, due to the availability of all the necessary numerical values.

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“…Thermoelectric and photoelectric types are the most commonly used sensors to evaluate solar irradiation and mathematical models to describe commercial photovoltaic module have been proposed [49,50] Photoelectric sensors normally apply silicon solar cells and measure their short circuit current [51]. Such sensors are simple in construction [52] and the light intensity can be converted directly to an electrical signal.…”

Section: Background: the Use Of Solar Cells For Irradiation Assessmentmentioning

confidence: 99%

Modeling and Experimental Validation of a Low-Cost Radiation Sensor Based on the Photovoltaic Effect for Building Applications

et al. 2016

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Abstract:The energy consumed to cool buildings is very elevated and solar gains represent a high percentage of these cooling loads. To minimize the thermal load it is necessary to control external shading systems. This control requires continuous measurement of solar radiation in different locations of the building. However, for such applications the use of conventional irradiance sensors increases the cost and reduces the profitability of the installation. This paper is focused on the development, modeling, and experimental validation of low cost irradiation sensors based on photovoltaic effect in order to reduce the costs of dynamic external shading devices and to improve the profitability of the system. With this proposal, firstly, small commercial photovoltaic cells have been adapted for use as an irradiation measurement device. Subsequently, quasi-stationary and continuous experimental measurements of these silicon cells, facing south and installed horizontally, have been carried out in Jaén (Spain) in 2009 and 2010. Finally, a nonlinear multiparameter function has been developed to evaluate the irradiance using the electric current generated by the cell, cell temperature, ambient temperature, and absolute humidity. A favorable agreement between the model predictions and experimental data has been observed with a coefficient of determination around 0.996 for all cells.

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Analytical Modeling of Partially Shaded Photovoltaic Systems

Cited by 166 publications

References 25 publications

Efficient Photovoltaic System Maximum Power Point Tracking Using a New Technique

Efficient Photovoltaic System Maximum Power Point Tracking Using a New Technique

A Simplified Microgrid Model for the Validation of Islanded Control Logics

Modeling and Experimental Validation of a Low-Cost Radiation Sensor Based on the Photovoltaic Effect for Building Applications

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