A Sun Tracking Error Monitor for Photovoltaic Concentrators

Luque-Heredia, I.; Cervantes, R.; Quéméré, Goulven

doi:10.1109/wcpec.2006.279553

Cited by 28 publications

(19 citation statements)

References 1 publication

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“…Concentration factors which correspond to a given angular restriction are marked, suggesting that very high single-junction efficiencies are possible using existing two-axis solar tracking technology. 19,20 While the results in Figure 2a are encouraging, they assume all recombination is radiative, which is unrealistic in a real material. Since GaAs can be fabricated with very high purity and excellent surface passivation via III-V capping layers, we consider only Auger recombination as it is the sole intrinsic, unavoidable source of nonradiative recombination.…”

Section: (2)mentioning

confidence: 92%

Highly efficient GaAs solar cells by limiting light emission angle

et al. 2013

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In a conventional flat plate solar cell under direct sunlight, light is received from the solar disk, but is re-emitted isotropically. This isotropic emission corresponds to a significant entropy increase in the solar cell, with a corresponding drop in efficiency. Here, using a detailed balance model, we show that limiting the emission angle of a high-quality GaAs solar cell is a feasible route to achieving power conversion efficiencies above 38% with a single junction. The highest efficiencies are predicted for a thin, light trapping cell with an ideal back reflector, though the scheme is robust to a non-ideal back reflector. Comparison with a conventional planar cell geometry illustrates that limiting emission angle in a light trapping geometry not only allows for much thinner cells, but also for significantly higher overall efficiencies with an excellent rear reflector. Finally, we present ray-tracing and detailed balance analysis of two angular coupler designs, show that significant efficiency improvements are possible with these couplers, and demonstrate initial fabrication of one coupler design.

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Section: (2)mentioning

confidence: 92%

Highly efficient GaAs solar cells by limiting light emission angle

et al. 2013

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“…6. The inner loop block corresponds to the transfer function (13); set the gains to K lp ¼ 0.069 and K li ¼ 1. …”

Section: Tuning Of the Stol Controllermentioning

confidence: 99%

“…[11] resorts on an ON-OFF controller with hysteresis. Luque et al [13] compare the performance of a Proportional Integral (PI) controller with the EUCLIDES algorithm. Ref.…”

Section: Introductionmentioning

confidence: 99%

Cascade closed-loop control of solar trackers applied to HCPV systems

Garrido

Díaz

2016

Renewable Energy

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a b s t r a c tHigh concentration photovoltaic (HCPV) modules require a high precision tracking system for reaching their highest conversion efficiency. One way to accomplish this goal is by using a closed-loop mechanism and a sun sensor to track the sunlight. This paper proposes a cascade control algorithm capable of achieving a sun tracking error of 1 0 for its application in high concentration photovoltaic systems. The algorithm follows an inner loop-outer loop topology. The inner loop employs a Nonlinear ProportionalProportional Integral (NP-PI) controller and the outer loop resorts on a Proportional Integral (PI) controller. A tuning procedure for setting up the cascade controller is also described. Experiments on a laboratory prototype compare the performance of the proposed cascade controller with a PI controller not resorting on an inner loop. These outcomes show that the proposed control law provides improved tracking accuracy with less actuator wear.

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“…Actually this is only half of the dissipating area available in a non-concentrating module (which dissipates the heat through the back and front faces). As the non-concentrator modules have a typical thermal increase of some 20 C above the ambient temperature including a large drop across the insulating layers it follows that in a concentrating module we may have roughly a thermal increase close to 40 C, which means that the cell will be at about 65 C for an ambient temperature of 25 C. Surprisingly the removal of heat is easier in point focus concentrators than in line focus ones in spite of the lower concentration that the latter can produce, because in line focus solutions we do not normally use an area equal to the entry aperture except through some kind of multi-finned solution.…”

Section: Receivermentioning

confidence: 99%

“…Hybrid control based on an error model may greatly reduce the calibration requirements. 20 Instrumentation to assess the tracking performance of concentrators is necessary to complete the development cycle of a concentrator. This instrumentation which may make use of today's solid-state image sensors is to monitor tracking accuracy with respect to peak power output and produce its statistics as shown in Figure 5 to uncover tracking problems.…”

Section: Trackingmentioning

confidence: 99%

Photovoltaic concentration at the onset of its commercial deployment

Ĺuque

Sala

Luque-Heredia

2006

Progress in Photovoltaics

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An overview of the field of photovoltaic concentration is provided taking into account that we think we are at the onset of its real commercialization. This belief is justified in this paper. It first contains a description of the different elements in a concentrator, stressing the challenges associated with each element, and then we describe briefly the different concentrators that we think are currently in a real pre-commercial stage. Finally, we discuss a number of issues associated to the deployment of the field including cost, experience, and market tendencies. This paper goes on to summarize the Conclusions.

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A Sun Tracking Error Monitor for Photovoltaic Concentrators

Cited by 28 publications

References 1 publication

Highly efficient GaAs solar cells by limiting light emission angle

Highly efficient GaAs solar cells by limiting light emission angle

Cascade closed-loop control of solar trackers applied to HCPV systems

Photovoltaic concentration at the onset of its commercial deployment

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