Sunplicity: from complex system design to standard product level

Real, Markus; Buhler, U.; Toggweiler, P.; Roth, Gregory L.; Bolliger, E.

doi:10.1109/wcpec.1994.520059

Cited by 3 publications

(3 citation statements)

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“…The first part of this prevention method is the ability to detect if a cell within a subpanel string is hot spotting. A few hot spot detection methods have been proposed previously, such as [14] and [15], which suggest methods that require sensor integration into the PV panel; these types of detection algorithms are unlikely to be adopted in the near future due to panel integration challenges and cost limitations. Additionally, a post-measurement data processing detection method is proposed in [16] and a model-based hot spot suppression algorithm is described in [17].…”

Section: Introductionmentioning

confidence: 99%

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

Kim

Seo

Cho

et al. 2016

IEEE Trans. Power Electron.

178

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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: Introductionmentioning

confidence: 99%

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

Kim

Seo

Cho

et al. 2016

IEEE Trans. Power Electron.

178

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show abstract

“…Total plant capacity particuler module capacity (1) In this plant total no of modules = 17250 250 = 69 modules (2)…”

Section: Number Of Modules=mentioning

confidence: 99%

“…Solar system will give desired output as per requirement and mostly used as a backup source in industries. To avoid the damage from hot spot situation a new concept is to limit the current instead of limiting the voltage across the shaded shell and it is easily done by current controller [1].The efficiency of solar modules can be increased by changing intensity of solar cell or by changing the tilt angle. The optimum tilt angle is different for every months of the year and also we can collect more solar energy by choosing optimum tilt angle for each month and also from that shadow effect can be minimize which increase power generation.…”

Section: Introductionmentioning

confidence: 99%