1,721,027 research outputs found
Investigation of Factors Affecting Induced Voltages on Underground Pipelines Due to Inductive Coupling with Nearby Transmission Lines
No full textThe induced voltage on underground pipelines is a critical parameter to consider for equipment and personnel safety in the field. However, in the real life, such induced voltage estimation on pipelines is difficult especially at the transmission line planning and routing stage. In this article, several factors affecting the induced voltage on underground pipelines due to inductive coupling with nearby transmission lines are investigated. These factors include the angle and separation distance between transmission lines and pipelines, the length of transmission lines and pipelines, and the soil model. A peak induced voltage calculation formula as the function of the angle and separation distance is derived through surface fitting of simulation data. It is proved in the article that other factors, such as the length of the transmission line and the soil model types, do not have significant influence on the peak induced voltage values on underground pipelines
Chassis influence on the exposure assessment of a compact ev during wpt recharging operations
Full text linkIn this study, the external magnetic field emitted by a wireless power transfer (WPT) system and the internal electric field induced in human body models during recharging operations of a compact electric vehicle (EV) are evaluated. The magneticfield is calculated with a hybrid scheme coupling the boundary element method with the surface impedance boundary conditions in order to fit the multiscale open-boundary characteristics of the problem. A commercial software is then used to perform numerical dosimetry. Specifically, two realistic anatomical models, both in a driving position and in a standing posture, are considered, and the chassis of the EV is modeled either as a currently employed aluminum alloy and as a futuristic carbon fiber composite panel. Aligned and misaligned coil configurations of the WPT system are considered as well. The analysis of the obtained results shows that the International Commission on Non-Ionizing Radiation Protection (ICNIRP) reference levels are exceeded in the driving position, especially for the carbon fiber chassis, whereas the system is compliant with the basic restrictions, at least for the considered scenarios
Critical comparative review of international standards on wireless charging for light-duty electric vehicles
No full textThis paper presents an overview of the most important international standards published in the last years to regulate inductive-type wireless charging systems for electric vehicles. The main contents related to electrical power components are presented in comparative form and some of the critical points not yet resolved are highlighted
Influence of posture and coil position on the safety of a WPT system while recharging a compact EV
Full text linkIn this study, the human exposure to the magnetic field emitted by a wireless power transfer (WPT) system during the static recharging operations of a compact electric vehicle (EV) is evaluated. Specifically, the influence of the posture of realistic anatomical models, both in standing and lying positions, either inside or outside the EV, is considered. Aligned and misaligned coil configurations of the WPT system placed both in the rear and front position of the car floor are considered as well. Compliance with safety standards and guidelines has proven that reference levels are exceeded in the extreme case of a person lying on the floor with a hand close to the WPT coils, whereas the system is always compliant with the basic restrictions, at least for the considered scenarios
I Charge, Therefore I Drive: Current State of Electric Vehicle Charging Systems
Full text linkI charge, therefore I drive. Is this the new paradigm? The ambitious goals set by governments worldwide to phase out gasoline-powered cars are the driving force behind the upgrade of electric vehicle (EV) charging infrastructures. The EV industry and roadways departments may be asked to invest more in wireless charging, that is, without the need for any cable. Transmitter pads that can charge the EV in the garage, or even briefly at traffic lights, may convey the stationary wireless charge, whereas coils embedded into roadways may power EVs as they drive overhead. The standardized wireless charge appears to be the optimum solution to placate the anxiety of drivers
Modelling of road–embedded transmitting coils for wireless power transfer
No full textThe present work stems from practical experiences in the implementation of a wireless power transfer charging lane based on transmitter coils directly embedded under the road surface. After the embedment, unexpected phenomena appeared which strongly modified the behavior of the coil, thus compromising the effectiveness of the system. This paper proposes the development of a dedicated numerical method based on the Partial Element Equivalent Circuit approach and low–rank compression techniques based on Hierarchical matrices and Adaptive Cross Approximation which allows optimized parametric analysis for the investigation of the main parameters that influence the behavior of the device. The proposed numerical approach is efficiently applied to an embedded transmitting coil with parametric material parameters of the road model. However, the proposed approach is general and can be applied for the study of different electromagnetic devices
Current distribution modeling in the open-source OPENSC2 tool for the multi-physics analysis of HTS and LTS cables
No full textIn the framework of Open Science, the OPENSC2open-source object-oriented software for multi-physics analysis has been developed to simulate the operating transients in forced-flow superconducting cables for fusion and power applications. Due to high magnetic fields and transport currents involved, the dissipated power by Joule effect and AC losses can compromise the thermal stability of the superconductors, so that the electromagnetic problem comes intrinsically with the thermal-hydraulic one. The numerical current distribution model, recently developed for OPENSC2, is reported here. After the solution verification and validation, followed by benchmarks against other software and experimental data, a first coupling with the thermal-hydraulic transients has been tested and reported in this work
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