Use of the Suns-Voc for diagnosing outdoor arrays &amp;amp; modules

Forsyth, M.; Mahaffey, Matthew; Blum, Adrienne L.; Dobson, Weston A.; Sinton, Ronald A.

doi:10.1109/pvsc.2014.6925302

Cited by 15 publications

(2 citation statements)

References 2 publications

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“…As with all outdoor characterization, measurement of environmental parameters is crucial for the correct translation to a standardized set of conditions. The methodology of outdoor Suns-V OC was introduced in 2014 for potential use on modules and arrays [107] and later expanded on with temperature correction from both backsheet sensors and weather stations [108]. There has also been recent work where large datasets have been postprocessed for use of Suns-V OC , which will be addressed in section 4.…”

Section: Outdoor Suns-v Ocmentioning

confidence: 99%

Measuring outdoor I–V characteristics of PV modules and systems

et al. 2022

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The cumulative installed capacity of photovoltaics has passed 1 TW, of which about two-thirds were only installed in the past five years. Many of these new installations incorporate novel module and cell designs that have not yet been subjected to long-term in-field characterization. Indoor accelerated stress testing has historically been a valuable methodology to identify fault mechanisms, estimate degradation rates, and to ensure the safety and normal operation of modules in the field. Still, these methodologies deliver an incomplete image of the exact stress mechanisms that photovoltaic systems are subject to outdoors, which vary with location, time of day, and time of year. In this work we review different outdoor methods to measure current-voltage characteristics of photovoltaic systems, discuss how the environmental conditions impact those characteristics, and examine alternative methodologies for acquiring light and pseudo current-voltage characteristics more applicable to larger scale installations. This review also provides an insight into methods useful for real-time monitoring and degradation analysis at the module and string level.

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Section: Outdoor Suns-v Ocmentioning

confidence: 99%

Measuring outdoor I–V characteristics of PV modules and systems

et al. 2022

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“…7 Here, we present a direct measurement, Suns-V OC , that is relatively simple to collect, can be collected at times of low irradiance, and is robust to partial shading. Suns-V OC has previously been demonstrated outdoors on modules and arrays, [15][16][17][18] but without details regarding day-to-day variation and impacts from uncontrollable weather. Variations include transient, diurnal, and seasonal effects like cloud coverage, 19 temperature changes, 20 wind, 21 angle-of-incidence changes, 22 spectral effects, 23 albedo, 24 and soiling.…”

Section: Context and Scalementioning

confidence: 99%

Monitoring of Photovoltaic System Performance Using Outdoor Suns-VOC

Killam

Karas

Augusto

et al. 2021

Joule

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Estimation of PV module degradation through extraction of I – V curve at inverter pre‐startup condition

Kumar

Nitheesh

Chakkarapani³

et al. 2020

IET Renewable Power Generation

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Decline in photovoltaic (PV) output power is observed due to aging factors such as solder bond failure, corrosion of busbars, formation of cracks in solar cell, failures of bypass diode etc. Furthermore, these happenings reflect changes in PV module parameters such as increment in series resistance/reduction in open-circuit voltage and/or decrease in fill factor etc. However, these parameter variations can be easily examined with the module level I-V curve. This study proposes a new approach of exploring the I-V curve of the PV module using an inverter pre-startup condition, i.e. just before sending the PV power to the grid. From this pre-startup I-V curve, one of the important parameters, i.e. module series resistance is estimated. The proposed method is investigated through simulations in MATLAB/Simulink and is experimentally tested on a PV output coupled to a grid-connected micro-inverter. The key advantage of the proposed method is that it does not require any additional circuitry/sensors to extract the I-V curve. Furthermore, there is no need to disconnect the PV from its normal operation.

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Use of the Suns-Voc for diagnosing outdoor arrays & modules

Cited by 15 publications

References 2 publications

Measuring outdoor I–V characteristics of PV modules and systems

Measuring outdoor I–V characteristics of PV modules and systems

Monitoring of Photovoltaic System Performance Using Outdoor Suns-VOC

Estimation of PV module degradation through extraction of I – V curve at inverter pre‐startup condition

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