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https://doi.org/10.21256/zhaw-27358| Publication type: | Master thesis |
| Title: | Module level power electronics dynamic and static performance in partial shaded photovoltaic systems |
| Authors: | Allenspach, Cyril Armand |
| Advisors / Reviewers: | Baumgartner, Franz Carigiet, Fabian |
| DOI: | 10.21256/zhaw-27358 |
| Extent: | 83 |
| Issue Date: | 2023 |
| Publisher / Ed. Institution: | ZHAW Zurich University of Applied Sciences |
| Publisher / Ed. Institution: | Winterthur |
| Language: | English |
| Subjects: | Module-level power electronic; Power optimizer; MLPE; Photovoltaic; Efficiency; Performance; Shading |
| Subject (DDC): | 621.3: Electrical, communications, control engineering |
| Abstract: | Within the EFFPVShade project of the ZHAW IEFE PV research group, the effective performance of module-level power electronics (such as power optimizers) in shaded conditions is evaluated and compared to conventional string inverter systems. This thesis illustrates part of the research, including the shading adaptation efficiency, a measure to compare the performance of conventional string inverters to systems with power optimizers in shaded conditions. Furthermore, indoor-laboratory measurements were conducted on three power optimizers (SolarEdge P370, Huawei SUN2000-450W-P, Tigo TS4-R-O). The results show a maximum measured DC/DC-efficiency of 99.5% ± 0.4% (k=1) (P370 and 450W-P) to 99.8% ± 0.3% (k=1) (TS4-R-O). However, such efficiencies are only achieved at a current ratio (Iout/Iin) of kI = 1.0, thus, when the MLPE device is acting as a low ohmic resistance without switching operation. In contrast, in operating points relevant to real-life operation, the efficiencies decrease by approximately 1% to 2.5 %. In regard to annual PV shading simulation, the ZHAW simulation tool MLPEShade was extended to simulate independent optimizers at a few PV modules and PV plants with halfcut cell PV modules. The results of annual simulations in MLPEShade were compared to commercial simulation tools (PVsyst, PVSOL). The results of the commercial tools show forecasts of additional yield by power optimizer systems with percentages in the double-digits (PVSyst: 7.2% | PVSol: 14.6 %) relative to the SINV system for the heavy shading case. The main reason for this is the use of the manufacturers’ data-sheet values for annual simulations and thus highly overestimating the power optimizer efficiency. Finally, based on the annual simulation results of eight shading scenarios, a list of performance-based recommendations for the application of the different PV systems was formulated. The main suggestions include the recommendation that conventional string inverter systems offer the highest performance for conditions with no shading or weak shading (e.g. ventilation pipe, chimney), as they achieved up to 1% higher annual yields relative to systems with optimizer. For residential PV plants with medium shading (e.g. roof edge, tree) PV systems with a string inverter, including independent power optimizers at a few most shaded modules, are recommended, as they achieved annual yield gains of up to 2% relative to the conventional string inverter system. Finally for solar plants with heavy shading, especially with large, distant objects (e.g. buildings), the system with a power optimizer at each PV module offered the highest annual yield gains of up to 4.2 %. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/27358 |
| License (according to publishing contract): | Licence according to publishing contract |
| Departement: | School of Engineering |
| Organisational Unit: | Institute of Energy Systems and Fluid Engineering (IEFE) |
| Published as part of the ZHAW project: | EFFPVSHADE – Effizienzanalyse von dezentraler Photovoltaik Leistungselektronik bei Teilbeschattung |
| Appears in collections: | Publikationen School of Engineering |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2023_Allenspach_Cyril_MSc_SoE.pdf | 36.79 MB | Adobe PDF |  View/Open |
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Allenspach, C. A. (2023). Module level power electronics dynamic and static performance in partial shaded photovoltaic systems [Master’s thesis, ZHAW Zurich University of Applied Sciences]. https://doi.org/10.21256/zhaw-27358
Allenspach, C.A. (2023) Module level power electronics dynamic and static performance in partial shaded photovoltaic systems. Master’s thesis. ZHAW Zurich University of Applied Sciences. Available at: https://doi.org/10.21256/zhaw-27358.
C. A. Allenspach, “Module level power electronics dynamic and static performance in partial shaded photovoltaic systems,” Master’s thesis, ZHAW Zurich University of Applied Sciences, Winterthur, 2023. doi: 10.21256/zhaw-27358.
ALLENSPACH, Cyril Armand, 2023. Module level power electronics dynamic and static performance in partial shaded photovoltaic systems. Master’s thesis. Winterthur: ZHAW Zurich University of Applied Sciences
Allenspach, Cyril Armand. 2023. “Module Level Power Electronics Dynamic and Static Performance in Partial Shaded Photovoltaic Systems.” Master’s thesis, Winterthur: ZHAW Zurich University of Applied Sciences. https://doi.org/10.21256/zhaw-27358.
Allenspach, Cyril Armand. Module Level Power Electronics Dynamic and Static Performance in Partial Shaded Photovoltaic Systems. ZHAW Zurich University of Applied Sciences, 2023, https://doi.org/10.21256/zhaw-27358.
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