The amorphous I/Au composite nanofilms were prepared by low vacuum direct current sputtering(LVDCS)method.The optimized preparation technologies contain growth pressure,time,gaseous environment and annealing condition...The amorphous I/Au composite nanofilms were prepared by low vacuum direct current sputtering(LVDCS)method.The optimized preparation technologies contain growth pressure,time,gaseous environment and annealing conditions.The maximum fluorescence emission(λemmax)of I/Au nanofilms was observed at wavelength of 375 nm,and the intensity of fluorescence emission peak of annealed I/Au films was smaller than that of unannealed one due to fewer amorphous Au nanoparticles,caused by annealing treatment.In the UV-Vis absorption spectra,the intensity of UV-Vis absorption peak of annealed I/Au nanofilms is larger than that of the unannealed one.This work also developed a new way to grow I/Au composite fluorescent thin films.展开更多
In this paper some photovoltaic, PV, conversion chains architectures for on-grid applications have been proposed and the advantage of the direct use of a Low Voltage Direct Current (LVDC) bus for the DC loads has been...In this paper some photovoltaic, PV, conversion chains architectures for on-grid applications have been proposed and the advantage of the direct use of a Low Voltage Direct Current (LVDC) bus for the DC loads has been shown. The evaluation of the efficiency of the proposed chains compared to the classical one was performed. It is shown that LVDC use instead of standard AC plugs, in numerous applications, is promising in future. The registered annual saved energy can exceed 25% of the PV generated energy. This important rate, the need of better services at lower economic cost and environmental burden will incite to make reflection about industry and supplies’ future standards.展开更多
With the increasing penetration of renewables,low voltage(LV)distribution networks face rising demands to accommodate an increasing range of renewable energies.Low voltage direct current(LVDC)distribution networks are...With the increasing penetration of renewables,low voltage(LV)distribution networks face rising demands to accommodate an increasing range of renewable energies.Low voltage direct current(LVDC)distribution networks are considered as a viable approach to alleviate the strain on existing distribution networks.Nonetheless,establishing reliable and selective protection solutions is recognized as crucial challenges to facilitate the wide adoption of LVDC.Several existing protection algorithms focus on significant fault currents,fixed threshold settings,and high sampling frequency to estab-lish effective coordination.However,these approaches are either constrained in low fault current scenarios or require expensive data acquisition techniques.To address such issues,this paper develops a novel self-adjusting based protection scheme.The method only utilizes the inherent post-transient voltage derivative(PTVD)sign and value with a self-adjusting mechanism to distinguish faults.The proposed method overcomes the selectivity limitations of existing voltage-based solutions when a lower sampling frequency is employed.The effectiveness is validated on an LVDC test network constructed in PSCAD/EMTDC and an RT-Box-based hardware test bed.Results under injected noise signals further demonstrate the robustness of the proposed method.展开更多
基金Funded by the National Natural Science Foundation of China(No.21676015)
文摘The amorphous I/Au composite nanofilms were prepared by low vacuum direct current sputtering(LVDCS)method.The optimized preparation technologies contain growth pressure,time,gaseous environment and annealing conditions.The maximum fluorescence emission(λemmax)of I/Au nanofilms was observed at wavelength of 375 nm,and the intensity of fluorescence emission peak of annealed I/Au films was smaller than that of unannealed one due to fewer amorphous Au nanoparticles,caused by annealing treatment.In the UV-Vis absorption spectra,the intensity of UV-Vis absorption peak of annealed I/Au nanofilms is larger than that of the unannealed one.This work also developed a new way to grow I/Au composite fluorescent thin films.
文摘In this paper some photovoltaic, PV, conversion chains architectures for on-grid applications have been proposed and the advantage of the direct use of a Low Voltage Direct Current (LVDC) bus for the DC loads has been shown. The evaluation of the efficiency of the proposed chains compared to the classical one was performed. It is shown that LVDC use instead of standard AC plugs, in numerous applications, is promising in future. The registered annual saved energy can exceed 25% of the PV generated energy. This important rate, the need of better services at lower economic cost and environmental burden will incite to make reflection about industry and supplies’ future standards.
文摘With the increasing penetration of renewables,low voltage(LV)distribution networks face rising demands to accommodate an increasing range of renewable energies.Low voltage direct current(LVDC)distribution networks are considered as a viable approach to alleviate the strain on existing distribution networks.Nonetheless,establishing reliable and selective protection solutions is recognized as crucial challenges to facilitate the wide adoption of LVDC.Several existing protection algorithms focus on significant fault currents,fixed threshold settings,and high sampling frequency to estab-lish effective coordination.However,these approaches are either constrained in low fault current scenarios or require expensive data acquisition techniques.To address such issues,this paper develops a novel self-adjusting based protection scheme.The method only utilizes the inherent post-transient voltage derivative(PTVD)sign and value with a self-adjusting mechanism to distinguish faults.The proposed method overcomes the selectivity limitations of existing voltage-based solutions when a lower sampling frequency is employed.The effectiveness is validated on an LVDC test network constructed in PSCAD/EMTDC and an RT-Box-based hardware test bed.Results under injected noise signals further demonstrate the robustness of the proposed method.
