An Investigation into Spectral Parameters as they Impact CPV Module Performance

Self Cite

Abstract. The IEC Working Group 7 (WG7) is in the process of developing a draft procedure for an outdoor concentrating photovoltaic (CPV) module power rating at Concentrator Standard Operating Conditions (CSOC). WG7 recently achieved some consensus that using component reference cells to monitor/limit spectral variation is the preferred path for the outdoor power rating. To build on this consensus, the community must quantify these spectral limits and select a procedure for calculating and reporting a power rating. This work focuses on statistically comparing several procedures the community is considering in context with monitoring/limiting spectral variation.

Section: Analysis/discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Procedural considerations for CPV outdoor power ratings per IEC 62670

Muller¹,

Kurtz²,

Rodriguez³

2013

Self Cite

“…PW absorbs the direct normal irradiance in the range that the bottom subcell (Germanium) corresponds to; this results to a decrease in DNI without affecting the CCA's current output since the bottom subcell never limits the current and therefore, the CCA's efficiency is increased. In addition, although the SF Vs efficiency relationship is almost linear with a R 2 0.9 in Las Vegas' simulated data (plot not given due to space restrictions), the 1:1 relationship should not be used because of the influence of fill factor also [22,23].…”

Section: Thermal Performance and Energy Yield Assessmentmentioning

confidence: 99%

Energy yield assessment of a high concentration photovoltaic receiver based on simulated spectra from typical meteorological year datasets

Theristis¹,

Férnández

Ferrer‐Rodríguez

et al. 2016

The performance of High Concentration Photovoltaic (HCPV) receivers is influenced by changes in the solar spectrum and operating solar cell temperature (Tcell). Since the solar spectrum is affected by the variation of air mass (AM), aerosol optical depth (AOD) and precipitable water (PW), it is important to investigate their impact on the performance of HCPV receivers. It is also known that the direct normal irradiance (DNI) and ambient temperature (Tamb) are dominant factors that can influence the operating Tcell. In this study, Class I data from the NREL’s typical meteorological year (TMY3) database are used in order to predict the energy yield (Eyield) of a HCPV receiver in two USA sites with relatively high annual direct normal irradiation; Las Vegas, NV and Tucson, AZ. The results show that, although the annual average Tcell in Tucson is higher by 1.8°C and the number of “sunny hours” are 20 less than Las Vegas, the Eyield is still higher by 1.6%. The annual spectral losses in Las Vegas and Tucson were found to be 5% and 3% respectively

“…At this point it is relevant to see how solar spectrum varies and the main factors that influence on it, therefore on CPV system's performance [1]. The main reason of spectral changes comes from the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Spectral network based on component cells under the SOPHIA European project

Núñez

Antón

Askins

et al. 2015

Self Cite

Abstract. In the frame of the European project SOPHIA, a spectral network based on component (also called isotypes) cells has been created. Among the members of this project, several spectral sensors based on component cells and collimating tubes, so-called spectroheliometers, were installed in the last years, allowing the collection of minuteresolution spectral data useful for CPV systems characterization across Europe. The use of spectroheliometers has been proved useful to establish the necessary spectral conditions to perform power rating of CPV modules and systems. If enough data in a given period of time is collected, ideally a year, it is possible to characterize spectrally the place where measurements are taken, in the same way that hours of annual irradiation can be estimated using a pyrheliometer.