Spectral mismatch in calibration of photovoltaic reference devices by global sunlight method

Müllejans, Harald; Ioannides, Andreas; Kenny, Robert P.; Zaaiman, W.; Ossenbrink, H.; Dunlop, Ewan D.

doi:10.1088/0957-0233/16/6/002

Cited by 42 publications

(22 citation statements)

References 9 publications

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“…

S M M = \frac{true \int S R_{dut} (λ) E_{ESTI} (λ) d λ}{true \int S R_{dut} (λ) E_{SUPSI} (λ) d λ} \frac{true \int E_{SUPSI} (λ) d λ}{true \int E_{ESTI} (λ) d λ}

where SR dut ( λ ) is the spectral responsivity of each of the considered device and E ESTI ( λ ) and E SUPSI ( λ ) are the spectral irradiance as measured by the JRC and SUPSI spectroradiometers, respectively. The SMM was derived from and highlights, for a specific device, the difference in using JRC or SUPSI spectra for calculating the correction to the standard spectrum AM1.5 . This parameter is affected by the spectra shape only.…”

Section: Impact On the Estimation Of A Photovoltaic Device Current (Imentioning

confidence: 99%

Intercomparison campaign of spectroradiometers for a correct estimation of solar spectral irradiance: results and potential impact on photovoltaic devices calibration

Galleano

Zaaiman

Virtuani

et al. 2013

Progress in Photovoltaics

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This paper describes the results of an intercomparison of spectroradiometers for global and direct normal incidence irradiance in the visible and near-infrared spectral regions together with an assessment of the impact these results may have on the estimation of the short-circuit current (I SC ) calibration of photovoltaic devices and on the spectral mismatch calculation. The intercomparison was conducted in the framework of the European project Apollon with the additional participation of external partners from the Italian project for the long-term monitoring of solar radiation for photovoltaics. Six institutions and six spectroradiometer systems, representing different technologies and manufacturers, were involved. Prior to the intercomparison, all participating partners calibrated their own instrument(s) according to their usual procedures in order to verify the entire measuring and traceability chain. The difference in measured spectra shape and amplitude showed to have an impact on I SC calculation of less than 3% and less than 6% for single-junction and multi-junction devices, respectively. When only the shape of the spectra is considered, the spectral mismatch ranges from 1.7% to 4.7% depending on the spectral response of the device.

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“…

S M M = \frac{true \int S R_{dut} (λ) E_{ESTI} (λ) d λ}{true \int S R_{dut} (λ) E_{SUPSI} (λ) d λ} \frac{true \int E_{SUPSI} (λ) d λ}{true \int E_{ESTI} (λ) d λ}

Section: Impact On the Estimation Of A Photovoltaic Device Current (Imentioning

confidence: 99%

Intercomparison campaign of spectroradiometers for a correct estimation of solar spectral irradiance: results and potential impact on photovoltaic devices calibration

Galleano

Zaaiman

Virtuani

et al. 2013

Progress in Photovoltaics

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“…A typical value is chosen for the pc‐Si modules (PV01–PV03). SF is given by 4, 7 where E STC is the standard spectrum defined in IEC 60904‐3 8, λ the wavelength in nm, SR the relative spectral response of the PV module which was measured by a solar simulator in AIST, and E is the measured solar spectrum. Figure 3 shows the relative spectral responses used in this study.…”

Section: Methodsmentioning

confidence: 99%

Effects of solar spectrum and module temperature on outdoor performance of photovoltaic modules in round‐robin measurements in Japan

Ishii

Otani

Takashima

2011

Progress in Photovoltaics

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The performance of six photovoltaic (PV) modules composed of polycrystalline silicon (pc-Si), amorphous silicon (a-Si), and hydrogenated amorphous silicon/crystalline silicon (a-Si:H/c-Si) modules was investigated at eight locations in Japan from August 2007 to December 2008. In addition, solar irradiance, solar spectrum, and module temperature were simultaneously measured in these round-robin measurements. In this study, we evaluate quantitatively the effects of module temperature and solar spectrum on the performance of the PV modules as thermal factor (TF) and spectral factor (SF), respectively. Furthermore, we investigate the variation in module performance, which is converted into module performance under standard test conditions (STC) using the TF and SF. In the case of the pc-Si modules, the variations in performance ratio under STC (PR STC ) for these modules range from 0.056 to 0.074 through the round-robin measurements. The TF indicates that the contribution of module temperature to the variation in performance is large, between about 15 and 20%. However, the SF suggests that the contribution of solar spectrum is quite small, less than 3%. In the case of the a-Si modules, the contribution of module temperature is about 8%. The performance is largely influenced by solar spectrum, more than 12% at its maximum. Consequently, the variations in the corrected PR STC of the a-Si modules are between 0.117 and 0.141. These large variations may result from the effects of thermal annealing and light soaking. The variation in PR STC of the a-Si:H/c-Si module is similar to that of the pc-Si modules.

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“…2. Measurements covering single days with clear sky conditions were also made on a module tracker, and with the performance of simultaneous spectral measurements, in order to obtain an effective outdoor calibration of the module in these close to ideal conditions [4].…”

Section: Introduction and Methodsmentioning

confidence: 99%

Performance Measurements of CIS Modules: Outdoor and Pulsed Simulator Comparison for Power and Energy Rating

Kenny

Nikolaeva-Dimitrova

Dunlop

2006

2006 IEEE 4th World Conference on Photovoltaic Energy Conference

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A method for energy yield prediction under development in this laboratory has proved to be accurate for crystalline Si modules, however, in the determination of an energy rating of CIS modules, it was found to be difficult to accurately predict the module performance based on simulator measurements. The Energy Rating (ENRA) procedure is based on determining the maximum power point Pmax as a function of the irradiance and the module temperature using standard pulsed simulator measurements. Long term outdoor measurements have been performed to test the method's accuracy. It has been observed that the power measured on the simulator is in general lower than that measured outdoors and this is a significant cause of the difficulties in the energy predictions. The short circuit current has not been found to be significantly different, rather the difference is mainly due to lower open circuit voltage and fill factor. It is known that pre-conditioning CIS modules by light soaking can increase these parameters, and a study has been made of the short term effect of light soaking on the module. It has been found that the light soaking does increase the power measured on the simulator, but the light soaking effect relaxes very quickly, and it is therefore important to measure the module immediately following light soaking.

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Spectral mismatch in calibration of photovoltaic reference devices by global sunlight method

Cited by 42 publications

References 9 publications

Intercomparison campaign of spectroradiometers for a correct estimation of solar spectral irradiance: results and potential impact on photovoltaic devices calibration

Intercomparison campaign of spectroradiometers for a correct estimation of solar spectral irradiance: results and potential impact on photovoltaic devices calibration

Effects of solar spectrum and module temperature on outdoor performance of photovoltaic modules in round‐robin measurements in Japan

Performance Measurements of CIS Modules: Outdoor and Pulsed Simulator Comparison for Power and Energy Rating

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