A new characterization method for solar cell dynamic impedance

Chenvidhya, Dhirayut; Kirtikara, K.; Jivacate, C.

doi:10.1016/j.solmat.2003.06.011

Cited by 38 publications

(19 citation statements)

References 3 publications

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“…These measurement plots verify two trends previously discussed in Section II: 1) as illumination and temperature increase, resistance decreases and capacitance increases and 2) as positive voltage bias increases, resistance decreases and capacitance increases. This is consistent with theory and findings in previous literature [20]- [23]. Based on data shown in Table I, changes in voltage bias tend to have a larger effect on the resistance and capacitance than illumination changes.…”

Section: B Single Pv Cell Ac Parameterssupporting

confidence: 93%

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Photovoltaic Hot-Spot Detection for Solar Panel Substrings Using AC Parameter Characterization

Kim

Seo

Cho

et al. 2016

IEEE Trans. Power Electron.

180

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Hot spotting is a problem in photovoltaic (PV) systems that reduces panel power performance and accelerates cell degradation. In present day systems, bypass diodes are used to mitigate hot spotting, but it does not prevent hot spotting or the damage it causes. This paper presents an active hot spot detection method to detect hot spotting within a series of PV cells, using ac parameter characterization. A PV cell is comprised of series and parallel resistances and parallel capacitance, which are affected by voltage bias, illumination, and temperature. Experimental results have shown that when a PV string is under a maximum power point tracking control, hot spotting in a single cell results in a capacitance increase and dc impedance increase. The capacitance change is detectable by measuring the ac impedance magnitude in the 10-70 kHz frequency range. An impedance value change due to hot spotting can be detected by monitoring one high-frequency measurement in the capacitive region and one low-frequency measurement in the dc impedance region. Alternatively, the dc impedance can also be calculated using dc operating point measurements. The proposed hot spot detection method can be integrated into a dc-dc power converter that operates at the panel or subpanel level.

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Section: B Single Pv Cell Ac Parameterssupporting

confidence: 93%

“…However, the values of the C p and R p model parameters vary depending on factors such as illumination, temperature, and cell voltage bias [20], [21]. When the R p value changes, resistance changes are visualized as the resistive magnitude regions moving up or down directly with the resistance change.…”

Section: A Pv Cell Dynamic Modelmentioning

confidence: 99%

Photovoltaic Hot-Spot Detection for Solar Panel Substrings Using AC Parameter Characterization

Kim

Seo

Cho

et al. 2016

IEEE Trans. Power Electron.

180

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show abstract

“…It has been seldom recognized [1][2][3][4] that useful knowledge may be gathered by analyzing ac characteristics of solar cells in addition to dc curves. Impedance spectroscopy (IS) measurements taken over a broad frequency range (Hz-MHz) provide information on any system that is composed of a combination of interfacial and bulk processes, such as transport, recombination and interfacial states in solar cells [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of buffer layer on minority carrier lifetime and series resistance of bifacial heterojunction silicon solar cells analyzed by impedance spectroscopy

et al. 2006

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“…Spectroscopic measurements can be done by expensive impedance spectroscopy equipment, reported by Kumar et al [12]. Alternatively, Chenvidhya et al has determined dynamic parameters utilizing laboratory equipment, with small periodic signals superimposing on AC signal as inputs to solar cells and FFT analysis of output signals [13]. From a dark I-V curve as showen in Figure 2, R S is a slope in the first quadrant and depends on resistances of bulk semiconductors and contacts.…”

Section: Electrical Parameters Of Solar Cellsmentioning

confidence: 99%

Construction of Tungsten Halogen, Pulsed LED, and Combined Tungsten Halogen-LED Solar Simulators for Solar CellI-VCharacterization and Electrical Parameters Determination

Namin

Jivacate²,

Chenvidhya³

et al. 2012

International Journal of Photoenergy

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I-Vcharacterization of solar cells is generally done under natural sunlight or solar simulators operating in either a continuous mode or a pulse mode. Simulators are classified on three features of irradiance, namely, spectral match with respect to air mass 1.5, spatial uniformity, and temporal stability. Commercial solar simulators use Xenon lamps and halogen lamps, whereas LED-based solar simulators are being developed. In this work, we build and test seven simulators for solar cell characterization, namely, one tungsten halogen simulator, four monochromatic (red, green, blue, and white) LED simulators, one multicolor LED simulator, and one tungsten halogen-blue LED simulator. The seven simulators provide testing at nonstandard test condition. High irradiance from simulators is obtained by employing elevated supply voltage to tungsten halogen lamps and high pulsing voltages to LEDs. This new approach leads to higher irradiance not previously obtained from tungsten halogen lamps and LEDs. FromI-Vcurves, electrical parameters of solar cell are made and corrected based on methods recommended in the IEC 60891 Standards. Corrected values obtained from non-STC measurements are in good agreement with those obtained from Class AAA solar simulator.

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A new characterization method for solar cell dynamic impedance

Cited by 38 publications

References 3 publications

Photovoltaic Hot-Spot Detection for Solar Panel Substrings Using AC Parameter Characterization

Photovoltaic Hot-Spot Detection for Solar Panel Substrings Using AC Parameter Characterization

Effect of buffer layer on minority carrier lifetime and series resistance of bifacial heterojunction silicon solar cells analyzed by impedance spectroscopy

Construction of Tungsten Halogen, Pulsed LED, and Combined Tungsten Halogen-LED Solar Simulators for Solar CellI-VCharacterization and Electrical Parameters Determination

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