Computer simulation of the effects of electrical mismatches in photovoltaic cell interconnection circuits

Bishop, Jim

doi:10.1016/0379-6787(88)90059-2

Cited by 383 publications

(231 citation statements)

References 2 publications

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“…This is commonly known as a hot spot. Hot spot heating will not only reduce the array power output, but it will damage cell materials, putting entire arrays out of action (Bishop 1998). It is therefore vital to find a way to solve this problem.…”

Section: Pv Cell Model Under Pscsmentioning

confidence: 99%

A Two-Stage Particle Swarm Optimization Algorithm for MPPT of Partially Shaded PV Arrays

Mao

Zhang

Duan

et al. 2017

International Journal of Green Energy

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Abstract:The power-voltage (P-V) characteristic curves of a PV array are nonlinear and have multiple peaks under partially shaded conditions (PSCs). This paper proposes a novel maximum power point tracking (MPPT) method for a PV system with reduced steady-state oscillation based on a two-stage particle swarm optimization (PSO) algorithm. The grouping method of the shuffled frog leaping algorithm (SFLA) is incorporated in the basic PSO algorithm (PSO-SFLA), ensuring fast and accurate searching of the global extremum. An adaptive speed factor is also introduced into the improved PSO to further enhance its convergence speed. Tests results show that the proposed method converges in less than half the time taken by the conventional PSO method, and the power is improved by 33% under the worst PSCs, which confirms the superiority of the proposed method over the standard PSO algorithm in terms of tracking speed and steady-state oscillations under different PSCs.

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Section: Pv Cell Model Under Pscsmentioning

confidence: 99%

A Two-Stage Particle Swarm Optimization Algorithm for MPPT of Partially Shaded PV Arrays

Mao

Zhang

Duan

et al. 2017

International Journal of Green Energy

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“…The solution algorithm employed in this work is similar to the one proposed by Bishop [12], based on addition of PWL current-voltage curves in a nested series-parallel configuration. The algorithm differs from that of Bishop in the selection of break-points for the construction of PWL curves (it uses a dynamically adaptive method that guarantees a minimum given precision), and in that it incorporates a curve-sorting algorithm that improves calculation performance for very large systems (consider that each tracker in the simulated PV plant consists of hundreds of cell blocks with individual IV curves).…”

Section: Shading Loss By Circuit Solutionmentioning

confidence: 99%

High resolution shading modeling and performance simulation of sun-tracking photovoltaic systems

Capdevila¹,

Marola²,

Herrerías³

2013

AIP Conference Proceedings

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A set of tools is being developed to increase the accuracy of energy conversion predictions for one and two axis vertical trackers. The work is centered on demonstrating accuracy improvements through finer resolution of simulation time steps, along with a more realistic calculation of mutual shading losses. The shading analysis tool is embedded in a CAD software environment and provides enhanced functionality to define arbitrary tracker geometry, module placement and string layout. Topographical aspects of the site are represented based on digital elevation model data and integrated as 3D surfaces for the tracker deployment. A dedicated energy conversion algorithm reproduces the complex behavior associated with partial shading of the PV array through solution of the system's electrical circuit. Effects of time step resolution and module layout are presented for an existing two-axis-tracking CPV plant.

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“…A thermal runaway causes high temperature differences within a CPV module which possibly cause damages. A current injected into a solar cell can be prevented by the usage of string diodes [2]. However, the usage of string diodes introduces significant additional power losses in normal operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Modeling the thermal runaway effect in CPV modules

Steiner¹,

Siefer²,

Bett³

2013

AIP Conference Proceedings

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In this work current injections into solar cells due to parallel connection within CPV modules are investigated. A current injection into a solar cell increases its temperature. If the current injection is above a certain threshold a thermal runaway is started. The current injection into a solar cell is limited by the short circuit current generated by a string of parallel connected cells. The value of the short circuit current is determined by the number of cells in parallel and by the concentration factor of sun light used in the CPV module. In this work the value of current injection is calculated above which a thermal runaway is triggered. For these calculations a model is introduced and tested with an experimental setup. The model shows a satisfying agreement with the measurement. The model is used to calculate the maximum number of solar cells for which the temperature increase due to current injection is limited to 20 K and a thermal runaway is prevented. This maximum number is presented in dependence of the concentration factor of sun light.

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Computer simulation of the effects of electrical mismatches in photovoltaic cell interconnection circuits

Cited by 383 publications

References 2 publications

A Two-Stage Particle Swarm Optimization Algorithm for MPPT of Partially Shaded PV Arrays

A Two-Stage Particle Swarm Optimization Algorithm for MPPT of Partially Shaded PV Arrays

High resolution shading modeling and performance simulation of sun-tracking photovoltaic systems

Modeling the thermal runaway effect in CPV modules

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