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Resonance Instability of Photovoltaic E-Bike Charging Stations: Control Parameters Analysis, Modeling and Experiment
摘要： This article presents an in-situ comparative analysis and power quality tests of a newly developed photovoltaic charging system for e-bikes. The various control methods of the inverter are modeled and a single-phase grid-connected inverter is tested under different conditions. Models are constituted for two current control methods; the proportional resonance and the synchronous rotating frames. In order to determine the influence of the control parameters, the system is analyzed analytically in the time domain as well as in the frequency domain by simulation. The tests indicated the resonance instability of the photovoltaic inverter. The passivity impedance-based stability criterion is applied in order to analyze the phenomenon of resonance instability. In conclusion, the phase-locked loop (PLL) bandwidth and control parameters of the current loop have a major effect on the output admittance of the inverter, which should be adjusted to make the system stable.
关键词： grid-connected inverter,photovoltaic,solar mobility,resonance instability,power quality,solar charging
更新于2025-09-16 10:30:52
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[IEEE 2018 IEEE International Conference on System, Computation, Automation and Networking (ICSCAN) - Pondicherry, India (2018.7.6-2018.7.7)] 2018 IEEE International Conference on System, Computation, Automation and Networking (ICSCA) - Automatic Charging of Multiple Smartphones Using Light Beam
摘要： The fastening of the communication is due to the blessing of electronic gadgets like smartphones and evolving data connectivity. The challenge that is faced is the energy drain of these gadgets that makes it mandatory to charge them multiple times a day. Any system that is capable of performing this task without the user’s knowledge and effort would really be a boon to the society. The proposed work aims at charging the gadgets using light beam. A new approach called auto-charge is used. The Auto-charge approach is based on two steps. First, we leverage solar charging technique but use it in indoor spaces, to remotely charge a smartphone using a light beam without a wire. Second, we employ an image processing based technique to detect and track smartphones on a desk for automatic smartphone charging. The auto-charge consists of a controller, rotator, light and camera. The prototype is able to detect the presence of smartphone within seconds and charge it as fast as existing wired chargers. Auto-charge is able to largely reduce the user’s efforts in smartphone charging and keeps the process absolutely user unaware.
关键词： smartphones,electronic gadgets,solar charging,image processing,auto charge,data connectivity
更新于2025-09-10 09:29:36
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Solar electricity production and taxi electrical vehicle conversion in Chile
摘要： Carbon emissions from the Chilean public transport sector have doubled between 2000 and 2013. Thus, the need to find alternative clean-air solutions is becoming increasingly critical. With this in mind, this paper addresses a solution to the aforementioned problem by studying the conversion of both taxis and “colectivos” (public taxis with defined routes) into electric vehicles (EV) to be used in the Chilean public transport sector. In Chile, 80% of taxis are Nissan V16s, meaning that all of these vehicles will be replaced and end up in landfills within the next 5e8 years. This study presents an option to give a second life to these vehicles, addressing environmental and financial issues. It compares emissions from the Nissan V16's conventional internal combustion engine (ICE) with an equivalent electric conversion prototype. Furthermore, it analyses the CO2 emissions from the EV that has been fully charged by the Chilean grid as well as one that has been charged by a solar photovoltaic system. A solar recharging station for EV taxis is designed, taking advantage of the high levels of solar radiation in Chile. The results show that EV conversion does not lead to real environmental benefits, in comparison to its ICE equivalent, when it is charged with the grid. However, the results also show a considerable decrease in cost and CO2 emissions per km travelled when using solar energy to charge the batteries. Future challenges include identifying solutions to cope with solar intermittence and minimizing CO2 emissions during periods of low radiation.
关键词： Public transport,Chile,CO2 emissions,Solar charging station,Electric vehicle
更新于2025-09-10 09:29:36