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A reconfigurable solar photovoltaic array under shadow conditions

Published on May 16, 2008
· DOI :10.1109/APEC.2008.4522840
Dzung Nguyen1
Estimated H-index: 1
(NU: Northeastern University),
Brad Lehman30
Estimated H-index: 30
(NU: Northeastern University)
Sources
Abstract
This paper proposes an adaptive reconfiguration scheme to reduce the effect of shadows on solar panels. A switching matrix connects a solar adaptive bank to a fixed part of a solar PV array, according to a model based control algorithm that increases the power output of the solar PV array. Control algorithms are implemented in real-time. An experimental reconfiguration PV system with the battery load is presented and is shown to verify the proposed reconfigurations.
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  • References (15)
  • Citations (53)
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#1D. D Nguyen (NU: Northeastern University)H-Index: 1
#2Brad Lehman (NU: Northeastern University)H-Index: 30
This paper proposes a modeling and computing algorithm to simulate and analyze the effect of non-uniform changing shadows (a passing cloud) on the output power of solar PV arrays. Each solar array is composed of a matrix of individual solar cells or solar modules interconnected in series and parallel. Bypass switches and diodes are also modeled. The model is able to determine the power loss in each solar cell and the hot spots of a shaded solar PV array as well as the PV output power. The model ...
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Most issues carried out about building integrated PV systems (BIPV) performance show average losses about 20-25% in electricity production. The causes are varied: mismatching losses, partial shadows, variations in I-V characteristics of PV modules due to manufacturing processes, differences in the orientations and inclinations of solar surfaces, temperature effects, etc. Most losses can be decreased by means of a suitable electronics. This paper shows the Intelligent PV Module concept, a low cos...
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#1N. D. Kaushika (IITs: Indian Institutes of Technology)H-Index: 2
#2N. K. Gautam (IITs: Indian Institutes of Technology)H-Index: 2
In this paper, the electrical characteristics of array interconnection schemes are investigated using simulation models to find a configuration that is comparatively less susceptible to shadow problem and power degradation resulting from the aging of solar cells. Three configurations have been selected for comparison: (i) simple series-parallel (SP) array which has zero interconnection redundancy; (ii) total-cross-tied (TCT) array which is obtained from the simple SP array by connecting ties acr...
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#1Shengyi Liu (USC: University of South Carolina)H-Index: 13
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An approach to model the solar cell system with coupled multiphysics equations (photovoltaic, electro-thermal, direct heating and cooling processes) within the context of the resistive-companion method in the Virtual Test Bed computational environment is presented.. Appropriate across and through variables are defined for the thermal terminal of the system so that temperature is properly represented as a state variable, rather than as a parameter of the system. This allows enforcement of the sys...
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Photovoltaic modules must generally be connected in series in order to produce the voltage required to efficiently drive an inverter. However, if even a very small part of photovoltaic module (PV module) is prevented from receiving light, the generation power of the PV module is decreased disproportionately. This greater than expected decrease occurs because PV modules which do not receive adequate light cannot operate on the normal operating point, but rather operate as loads. As a result, the ...
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This paper describes a novel utility interactive photovoltaic inverter. Since photovoltaic modules in photovoltaic power generation systems in urban areas are installed on roofs, shadows created by neighboring homes, utility poles, and trees may sometimes cover some part of the photovoltaic modules. In this case, power generated from each photovoltaic module becomes unbalanced and its total generation power is greatly decreased, especially when the photovoltaic modules are connected in series. T...
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Abstract In photovoltaics the actual curve of the current-voltage characteristics of a solar generator is often needed, for example if the maximum power point is to be determined. It is convenient to use a model for the description of the relationship between current and voltage, which is able to describe the solar cell in the generation region as well as the breakdowns at positive and negative voltages. As the mathematical expression cannot be given in an explicit form, a set of suitable numeri...
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#1V. Quaschning (Technical University of Berlin)H-Index: 1
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Shading of solar cells not only reduces the cell power P/sub MPP/, but also changes the open-circuit voltage V/sub OC/, the short circuit-current I/sub SC/, the fill factor FF, and the efficiency /spl eta/. The authors introduce a shading factor S describing the amount of shading. From the well-known solar cell equations, the authors have calculated approximate equations for the solar cell parameters as a function of the shading factor S. They then compare these equations with simulated values. ...
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#1Ward Jewell (WSU: Wichita State University)H-Index: 20
#2T.D. UnruhH-Index: 1
The cost and the effect on utility reliability of rapidly changing PV (photovoltaic) generation on a partly-cloudy day were investigated. When cloud shadows move across a PV array, the array's power output is reduced. It resumes full production when the shadow moves away. The utility must follow these changes with other types of generation. Under certain cloud conditions, these changes can be large and fast. A methodology is presented to assess the cost of such fluctuations in PV generation and ...
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#1M.A. El-Shibini (Cairo University)H-Index: 1
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It is noted that to overcome the problem of mismatch between solar cells and a given load, maximum power-point tracking should be used. A simple efficient maximum power-point tracking technique is developed. The connection strategy depends on a very simple criterion which is the measurement of the solar radiation level. The control strategy is based on appropriate logic that compares the signs of dP/dt and dV/dt. The proposed technique is applied to the cases of resistive load, resistive load wi...
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Abstract Partial shading is one of the major drawback which diminishes the power output of the PV array. One of the effective methodologies is reconfiguration strategies, namely shifting the location of PV modules from one place to different places so as to distribute shading effects over the array to increase maximum power output under PSCs. This paper proposed two novel puzzle arrangements followed by Ken-Ken (KK) and Skyscraper (SS) for 4 × 4 total-cross-tied (TCT) PV array and increase maxim...
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