The Outdoor Field Test and Energy Yield Model of the Four-terminal on Si Tandem PV Module

Araki, Kiyomichi; Tawa, Hiroki; Saiki, Hiromu; Ota, Yasuyuki; Nishioka, Kensuke; Yamaguchi, Masafumi

doi:10.20944/preprints202003.0028.v2

Cited by 4 publications

(1 citation statement)

References 49 publications

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“…We did not consider this factor as it is affected by the PV cell properties and interconnects inside the module. Recently, multi‐junction PV cells, especially Si tandem cells, have been tested for application to VIPV 29 . The solar spectral distribution depends on the car roof curvature, and the power output of these PV cells varies accordingly 95,96 . However, the mismatching loss with the spectrum also depends on the bandgap design of the multi‐junction PV cells.…”

Section: Discussionmentioning

confidence: 99%

Curve correction of vehicle‐integrated photovoltaics using statistics on commercial car bodies

Ota

Araki

Nagaoka

et al. 2021

Progress in Photovoltaics

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Typically, car roofs are curved, which means that vehicle‐integrated photovoltaics (VIPVs) are also curved along the roof surface. The performance of the PV module is influenced by the local cosine loss and self‐shadowing loss due to the curved surface. The ratio between the solar irradiances of curved and flat surfaces is defined as the curve correction factor, and it widely varies with the shape of the curved surface. When the curve correction factor is less than unity, the PV on a curved car roof performs worse than the PV on a flat plate. Understanding the typical range of the curve correction factor is important for the estimation of the energy generated by VIPV. We investigated the curved shapes of 100 lines of cars and 200 cases. The curved shapes were then used to extract eight nondimensional geometric parameters, and the distributions and correlations among the parameters were investigated. The parent population of the curved surfaces was estimated via a Monte Carlo simulation based on an analysis of the statistical characteristics. The distribution of curve correction factors for the car population was calculated via differential geometry weighted by the distribution of incident angles of sunlight (direct and diffused) affected by shading along the streets, which was obtained from 1 year of driving data for Miyazaki City, Japan. The curve correction factors were highly skewed, but the average value was 0.92. This means that VIPV requires a 10% boost in performance to compensate for the inherent loss due to the geometry of curved roofs.

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Section: Discussionmentioning

confidence: 99%

Curve correction of vehicle‐integrated photovoltaics using statistics on commercial car bodies

Ota

Araki

Nagaoka

et al. 2021

Progress in Photovoltaics

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Reliability Assessment of Power Systems in High-Load Areas with High Proportion of Gas-Fired Units Considering Natural Gas Loss

Zeng

Wang

et al. 2023

Applied Sciences

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The “dual-carbon” policy underscores the crucial importance of a secure and stable natural gas supply to ensure the reliable operation of power systems. In high-load areas with a high proportion of gas-fired units and no alternative energy supply, urgent attention needs to be paid to the impact of natural gas loss on power system reliability. Given this background, a method to evaluate power system reliability that considers natural gas supply fluctuations is proposed. In this method, a reliability model of the natural gas supply chain based on the minimal cut set theory is constructed and the influence of policy regulations and economic market factors on system components is quantified. Then, a reliability-evaluation model for a power system that considers gas loss is constructed, and a non-sequential Monte Carlo simulation is used to solve it. Afterward, a reliability-evaluation method considering the power system reserve capacity is proposed. Finally, case studies on a natural gas system with a 14-node power system of a certain area are performed to verify the effectiveness of the proposed method, and the simulation results demonstrate that the reliability of the energy supply directly affects the reliability of the power system.

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Vector-Based Advanced Computation for Photovoltaic Devices and Arrays: Numerical Reproduction of Unusual Behaviors of Curved Photovoltaic Devices

Araki,

Ota,

Nishioka

2024

Applied Sciences

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Most equations and models for photovoltaics are based on the assumption that photovoltaic (PV) devices are flat. Therefore, the actual performance of nonplanar PV devices should be investigated and developed. In this study, two algorithms were developed and defined using vector computations to describe a curved surface based on differential geometry and the interaction with non-uniform solar irradiance (i.e., non-uniform shading distribution in the sky). To validate the computational model, the power output from a commercial curved solar panel for the Toyota Prius 40 series was monitored at four orientation angles and in various climates. Then, these were compared with the calculation results obtained using the developed algorithm. The conventional calculation used for flat PV devices showed an overestimated performance due to ignorance of inherent errors due to curved surfaces. However, the new algorithms matched the measured trends, particularly on clear-sky days. The validated computation method for curved PV devices is advantageous for vehicle-integrated photovoltaic devices and PVs including building-integrated photovoltaics (BIPVs), drones, and agriphotovoltaics.

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The Outdoor Field Test and Energy Yield Model of the Four-terminal on Si Tandem PV Module

Cited by 4 publications

References 49 publications

Curve correction of vehicle‐integrated photovoltaics using statistics on commercial car bodies

Curve correction of vehicle‐integrated photovoltaics using statistics on commercial car bodies

Reliability Assessment of Power Systems in High-Load Areas with High Proportion of Gas-Fired Units Considering Natural Gas Loss

Vector-Based Advanced Computation for Photovoltaic Devices and Arrays: Numerical Reproduction of Unusual Behaviors of Curved Photovoltaic Devices

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