TY - CHAP A1 - Gottschalk, L. A1 - Pflaum, D. A1 - Schneider, S. A1 - Schulze, Achim A1 - Becker, F. A1 - Queck, M. A1 - Hüttl, B. T1 - Evaluation of a compehensive IV- Outdoor Characterization Method for Photovoltaik Modules T2 - Proceedings of the 33rd EU-PVSEC KW - Photovoltaik KW - IV-Outdoor Characterization Y1 - 2017 ER - TY - CHAP A1 - Wachter, M. A1 - Gottschalk, L. A1 - Simmler, M. A1 - Schulze, Achim A1 - Becker, F. A1 - Sayala, M. A1 - Hüttl, B. T1 - Short-cicuit current measurement at clear-sky conditions on photovoltaik modules T2 - Proceedings of the 32nd EU-PVSEC KW - Photovoltaik KW - Short circuit current measurement Y1 - 2016 ER - TY - CHAP A1 - Kaiser, D. A1 - Simmler, M. A1 - Wachter, M. A1 - Becker, F. A1 - Sayala, M. A1 - Kaden, T. A1 - Schulze, Achim A1 - Hüttl, B. T1 - Concept for fast and precise PV Module Outdoor Characterization T2 - Proceedings of the 31st EU-PVSEC KW - Photovoltaik Y1 - 2015 ER - TY - CHAP A1 - Schulze, Achim A1 - Hüttl, B. A1 - Neubert, S. A1 - Hund, B. A1 - Luschitz, J. A1 - Patzlaff, T. T1 - 2D Analysis of thin-film modules T2 - Proceedings of the 25th EU-PVSEC KW - Photovoltaik KW - thin-film modules Y1 - 2010 ER - TY - CHAP A1 - Schneider, S. A1 - Hüttl, B. A1 - Pflaum, D. A1 - Schnell, V. A1 - Schulze, Achim T1 - Freifeldcharakterisierung von PV-Anlagen im Rahmen des Projektes PV- FeldLab -ein Statusbericht- T2 - 3. Regenerative Energietechnik Konferenz in Nordhausen N2 - Das Projekt PV-FeldLab verfolgt das Ziel, ein umfassendes Konzept für eine messtechnisch sehr präzise elektrische Freifeld-Charakterisierung von PV-Generatoren zu entwickeln. Es beinhaltet eine optische Untersuchung mittels drohnengestützter Thermografie und eine genaue elektrische Charakterisierung von PV-Anlagen im Freifeld, auch bei räumlicher Inhomogenität von Bestrahlungsstärke, Temperatur und bei variablen Aufbauwinkeln von Modulen im Strang. Die Verknüpfung der elektrischen und optischen Messdaten erlaubt eine effiziente Untersuchung von PV-Anlagen und ermöglicht eine Präzisierung von Ertragsanalysen. Dieser Bericht beschreibt den ersten Projektabschnitt, in welchem der Fokus vor allem auf der Initialisierung der messtechnischen Komponenten, sowie ersten Messungen und Analysen liegt. KW - Photovoltaik, Messtechnik, Charakterisierung von Solarmodulen Y1 - 2020 PB - RET.con 2020 CY - Nordhausen ER - TY - CHAP A1 - Schneider, S. A1 - Hüttl, B. A1 - Gerstenberg, L. A1 - Wesselak, V. A1 - Voswinckel, S. A1 - Schulze, Achim T1 - PV-FeldLab -Feldlabor für Vorort-Leistungsbestimmungen und Alterungsidentifikation von Photovoltaikgeneratoren T2 - 2. Regenerative Energietechnik Konferenz in Nordhausen N2 - Ziel des Projektes ist es, ein Verfahren für elektrische Vorort-Leistungsanalysen von Photovoltaik (PV)-Anlagen zu entwickeln. Dazu werden die elektrischen Parameter von PV-Strings lokal und global mit Hilfe eines neuen Feldlaboransatzes mit Indoor-Laborgenauigkeit vermessen. Das neue Messverfahren ist normgerecht und wird helfen, die Standardisierung von Feldmessungen weiterzuentwickeln. Im Projekt werden bekannte Messmethoden der Photovoltaik, (IR-Thermografie, I-U-String-Messung, digitale Datenverarbeitung mittels Selbstreferenzierung) zu einem innovativen Gesamtkonzept synthetisch zusammengeführt. Die Entwicklung des Messverfahrens wird an speziell gealterten PV-Anlagen marktbestimmender Technologien (c-Si-, CdTe-, CIGS-Muster-PV-Anlagen) vorangetrieben. So wird das Verfahren auf Erkennung spezifischer Degradationsszenarien und marginaler quantitativer Parameterveränderungen trainiert und geschärft KW - Photovoltaik, Messtechnik, Charakterisierung von Solarmodulen Y1 - 2019 PB - RET.com 2019 CY - Nordhausen ER - TY - CHAP A1 - Schneider, S. A1 - Pflaum, D. A1 - Gottschalk, L. A1 - Schulze, Achim A1 - Hüttl, B. T1 - Laborgenaue elektrische Charakterisierungen von PV-Modulen unter Feldbedingungen T2 - 1. Regenerative Energietechnik Konferenz in Nordhausen N2 - Outdoor-I-U-Messungen an Photovoltaik- (PV) - Modulen haben den Vorteil, dass Effekte wie „light soaking“ oder „light-induced degradation“ unter natürlichen Bedingungen untersucht werden können. Solche Outdoor-Analysen können unter Anwendung des Selbstreferenzierungsalgorithmus (SRA) die Zuverlässigkeit von Indoor-Flasher-Messungen erreichen. Dieses neue Konzept liefert I-UEigenschaften für wesentlich mehr Testbedingungen als vom Standard IEC 61853 gefordert und so können Schwachlichtkurven aller relevanten elektrischen I-U-Parameter für bestimmte Temperaturen erzeugt werden. Wir berichten über experimentelle Ergebnisse einer 6-tägigen Outdoor-Messkampagne an Dünnschicht-PV-Modulen. Wir evaluieren darüber hinaus die Möglichkeiten, Temperaturkoeffizienten, STC- und NOCT-Daten zu bestimmen und I-U-Kennlinien als Basis für Fitting-Analysen abzuleiten. Abschließend wird die Genauigkeit der neuen Outdoor-Methode untersucht. KW - Photovoltaik, Messtechnik, Charakterisierung von Solarmodulen Y1 - 2018 PB - RET.con 2018 CY - Nordhausen ER - TY - CHAP A1 - Hüttl, B. A1 - Heimfarth, J.P. A1 - Schulze, Achim A1 - Schelhase, S. A1 - Hafemeister, M. A1 - Weiler, U. A1 - Queck, M. A1 - Patzlaff, T. A1 - Bauer, M. A1 - Becker, F. T1 - Improved JV-Analysis on CdTe Dot Cells by Controlled Series Resistance T2 - Proc. 27th European Photovoltaic Solar Energy Conference and Exhibition N2 - CdS/CdTe thin film solar technology is one of the most promising concepts to accomplish high efficiencies and low costs in mass production. Further knowledge about electric parameters, such as serial resistances and recombination losses, is needed in order to improve in a systematic approach the module efficiency. The basic tool for device evaluation is the JV-measurement (current density – voltage) under standard test conditions. JVmeasurements result in rather direct determination of electric parameters, and detailed JV-analysis in indirect determination of some more relevant electric parameters. For thin film solar cells the usual 2-diode model and the responsible equation can be reduced to a 1-diode model due to significant recombination processes in the space charge region. However, the fit results suffer on imprecision of derived recombination currents (Jrec), and series resistance (Rs), due to their ambiguousness in fit routine. Direct and precise access of Rs by measurements fails for CdTe, due to its significant dependency on illumination levels. In this work we present a new method for precise Rs and Jrec determination of CdTe cells. KW - CdTe, CIS and Related Ternary and Quaternary Thin Film Solar Cells Y1 - 2012 PB - 27th European Photovoltaic Solar Energy Conference and Exhibition ER - TY - CHAP A1 - Hüttl, B. A1 - Wachter, M. A1 - Gottschalk, L. A1 - Schulze, Achim A1 - Becker, F. T1 - Self Reference Algorithm for Precise Outdoor Characterization of PV Modules T2 - PV-Days Halle 2016 N2 - Outdoor or just on site analyzes of photovoltaic modules can offer some advantages in comparison to indoor Lab stud-ies. In this way the electrical performance is monitored and logged under natural operating conditions in full range of irradiation and temperature. The entirety of monitored IV data allows deriving low-light characteristics of electric parameters, temperature coefficients and root cause analysis for possible degradation. We apply so-called self-reference algorithm in order to increase the accuracy of analysis. The improved precision is due to application of effective acting irradiation and effective temperature instead of externally measured data. Effective irradiation is determined in self-referencing scheme: the short circuit current of the module is assigned to the irradiation. KW - Photovoltaic systems, Metrology, Solar Modules Y1 - 2016 PB - PV-Days Halle 2016 CY - Halle ER - TY - CHAP A1 - Wachter, M. A1 - Gottschalk, L. A1 - Simmler, M. A1 - Schulze, Achim A1 - Becker, F. A1 - Sayala, M. A1 - Hüttl, B. T1 - Short Circuit Current Measurements at Clear-Sky Conditions on Photovoltaic Modules: Basic for a Reliable Self-Reference Algorithm T2 - Proc. 32nd European Photovoltaic Solar Energy Conference and Exhibition (PVSEC) N2 - Outdoor or just on site analyzes of photovoltaic modules can offer some advantages in comparison to indoor Lab studies. In this way the electrical performance is monitored and logged under natural operating conditions in full range of irradiation and temperature. The entirety of monitored IV data allows deriving low-light characteristics of electric parameters, temperature coefficients and root cause analysis for possible degradation. We apply so-called self-reference algorithm in order to increase the accuracy of analysis. The improved precision is due to application of effective acting irradiation and effective temperature instead of externally measured data. Effective irradiation is determined in self-referencing scheme: the short circuit current of the module is assigned to the irradiation. This assignment has to be calibrated, preferably at standard test conditions for irradiation. In this contribution we demonstrate a process of precise measurement of Isc under clear-sky outdoor conditions and the determination of the short circuit current for STC. The measurement method avoids errors by spectral deviations with respect to AM 1.5G spectrum, by optical reflection losses for high angles of incidence and errors by high albedo impact. In particular we investigate comparatively a CdTe module under outdoor conditions and by means a calibrated indoor Lab flasher. KW - Photovoltaic systems, Metrology, Solar Modules Y1 - 2016 PB - 32nd European Photovoltaic Solar Energy Conference and Exhibition (PVSEC) ER - TY - CHAP A1 - Schneider, S. A1 - Daume, D. A1 - Neumeyer, T. A1 - Pflaum, D. A1 - Schulze, A. A1 - Hüttl, B. T1 - Charakterisierung von PV-Generatoren bei variabler Bestrahlungsstärke und Temperatur - Zwischenbericht zum Projekt PV-FeldLab T2 - Tagungsband der 4. Regenerativen Energietechnik Konferenz (RET.Con) KW - Photovoltaik KW - Solarmodule KW - Charakterisierung Y1 - 2021 SN - 978-3-940820-17-4 SP - 86 EP - 95 ER - TY - CHAP A1 - Daume, D. A1 - Schulze, A. A1 - Schneider, S. A1 - Neumeyer, T. A1 - Beck, T. A1 - Steinbach, S. A1 - Hüttl, B. T1 - Accurate Short-Circuit Current Measurements on Photovoltaic Modules – Challenges for On-site Outdoor Determinations T2 - Proc. of 38th European Photovoltaic Solar Energy Conference and Exhibition (PVSEC), 4AV.2.6., September 2021, Lissabon KW - Photovoltaik KW - Solarmodule KW - Charakterisierung Y1 - 2021 ER - TY - CHAP A1 - Scheler, M. A1 - Daume, D. A1 - Sojitra, D. A1 - Neumeyer, T. A1 - Steinbach, S. A1 - Beck, T. A1 - Schulze, A. A1 - Hüttl, B. T1 - Precise On-Site Power Analysis of Photovoltaic Arrays by Self-Reference Algorithm T2 - Proceedings of the 8th World Conference on Photovoltaic Energy Conversion N2 - To detect degradation of photovoltaic systems at an early stage, precise performance determinations are essential. Current-voltage measurements on single modules in indoor labs under well-defined conditions are state-of-the-art. However, this method causes a logistical and economic effort. On-site measurements reduce the effort but are prone to error because of poorly determinable test conditions: The detected temperature on the backside of modules as well as the irradiance detected by pyranometer in tilted module plane usually differs from the actual operating conditions. In consequence, the accuracy of measured current-voltage characteristics is poor. A precise on-site power determination is achieved by a self-reference algorithm. Improvements by self-referencing are not achieved by correcting the raw electrical data, but by replacing the measured test conditions (temperature and irradiance) with effective data. These effective values correspond better to the actual module irradiance and temperature values. Furthermore, precise power determination of photovoltaic arrays requires to identify and exclude emporarily deformed current-voltage curves from consideration, as it can arise from non-uniform irradiation within array like shading. In this paper, the application of a digital curve filter is reported and performance determinations by a self-reference algorithm are demonstrated on a photovoltaic array. We review and discuss the measurement concept in terms of its ease of use. …  KW - Environmental Effect, Evaluation, Experimental Methods, Performance, PV Array Y1 - 2022 UR - https://doi.org/10.4229/WCPEC-82022-4DO.1.4 ER -