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[IEEE 2019 2nd International Conference on Smart Grid and Renewable Energy (SGRE) - Doha, Qatar (2019.11.19-2019.11.21)] 2019 2nd International Conference on Smart Grid and Renewable Energy (SGRE) - Optimal Configuration for Building Integrated Photovoltaics System to Mitigate the Partial Shading on Complex Geometric Roofs
摘要： Middle East region has a high capability of adopting Photovoltaics system due to the massive values of irradiation that this region has. Many new building projects being established in the region with roof spaces that can be utilized to install Building Integrated Photovoltaics (BIPV) system. However, due to the contemporary, sophisticated geometric design of the roofs in most of the building projects, the curvature of the rooftop creates a big insolation difference due to the partial shading of these rooftops. This paper illustrates the partial shading on the BIPV modules in one of Qatar’s most recent project (Qatar Rail stations) by collecting data from the regional weather station and simulated data by using Building Information Modeling (BIM) for insolation simulation. The modeling of the BIPV system was done in MATLAB/Simulink. Different system configuration layout scenarios for different BIPV insolation were examined to show the behavior of which I-V and P-V characteristics with the highest insolation BIPV array. it is concluded that the system is preferred to be separated in parallel connection to not limit its current components with the smallest insolation value among all BIPV arrays. The outcomes of the proposed algorithm are believed suggestive facilitating for development of BIPV systems—a new domain combined architecture and solar energy integration.
关键词： Shading,Complex Roofs,Building Integrated Photovoltaics (BIPV)
更新于2025-09-23 15:19:57
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Electrical system architectures for building-integrated photovoltaics: A comparative analysis using a modelling framework in Modelica
摘要： Building integrated photovoltaic (BIPV) systems may be catalyzers of sustainable, near-zero energy buildings. To maximize the benefits of employing BIPV, it is important to integrate them properly into the grid of the building. The discussion on AC versus DC distribution for microgrid and nanogrid backbones is currently revisited as the level of penetration of renewable sources, electric vehicles and DC loads is constantly increasing. This paper tackles this question and provides guidelines using a validated simulation framework. The study compares DC (48 V and 380 V) and AC (230 V/50 Hz) topologies integrated into a ten-story office building with fa?ade-integrated BIPV. Annual simulations are carried out for five locations with different climatic conditions and comparisons are made in terms of system- and component-level efficiency, system losses, self-sufficiency, self-consumption and CO2 emission. The analysis shows that the DC topologies perform better than the AC one, especially for the locations with high solar energy yield compared to the cooling and heating loads. Further, a parametric analysis is performed to determine the optimal sizing of the building grid components, DC and AC alike. Finally, different scenarios of battery energy storage system capacity are examined in order to test the sensitivity of the performed analysis.
关键词： Modelica,Building-Integrated Photovoltaics (BIPV),Electrical configuration,Modelling,Building energy simulation
更新于2025-09-16 10:30:52
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Stress mitigation for adhesively bonded photovoltaics with fibre reinforced polymer composites in load carrying applications
摘要： Structural loads, especially in-plane compression, may cause local buckling and debonding of the photovoltaic (PV) cells that are mechanically integrated with structural members and this may lead to degradation in their electrical performance. This paper proposes an approach to mitigate the strains transferred from structural members to PV cells through the partial composite action provided by low-modulus adhesives. Specimens were fabricated by bonding amorphous silicon (a-Si) PV cells to glass fibre reinforced polymer (GFRP) structural components by an adhesive layer of 0.5- or 2.0-mm thickness. Two types of adhesives were used including a two-part rigid epoxy adhesive and a low-modulus silicone adhesive. These integrations were then submitted to in-plane compressive loadings. PV cells bonded by the silicone adhesive showed no damages during loading. While for PV cells bonded by epoxy adhesives, obvious electrical performance degradations were observed, when the strain reached 0.62% or 0.23% for specimens bonded by epoxy with a layer thickness of 0.5 mm or 2.0 mm respectively. Debonding and local-buckling of the PV cells were also witnessed. Theoretical analysis was conducted to understand the strain mitigation of the adhesive as a result of the induced partial composite action. Results demonstrate that such strain differences between the GFRP and the bonded PV cell are dominated by the shear modulus and thickness of the adhesive layer as well as elastic modulus, thickness and length of the PV cell. The theoretical analysis was validated by finite element (FE) modelling and design suggestions are provided accordingly.
关键词： Building integrated photovoltaics (BIPV),Solar cell,Compression,Bonding,Adhesive,Composite action,Fibre reinforced polymer composites
更新于2025-09-16 10:30:52