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The voltage of DC traction network is decreased to ensure the stability of power network by utilizing regenerative braking energy generated by metro. This paper adds the function of inverter feedback based on the original resistance energy-consuming device, and designs an inverter-resistive hybrid feedback device. It mainly describes the design method, hardware composition and control method of the device. The simulation of the braking condition of the DC traction network metro is carried out, and the simulation results are compared with the pure resistance energy consumption simulation. It is verified that the traction network voltage can be rapidly reduced and stabilized when the metro is braking, and the problem of resistance heating in the tunnel is improved to a large extent. At the same time, the energy of the DC traction network is inversed into the three-phase AC power grid, so that the utilization ratio of the regenerative braking energy is improved. The system design can achieve high efficiency absorption of regenerative braking energy and ensure the safe and stable operation of the metro. [ABSTRACT FROM AUTHOR]

The present work is focused on the investigation of thioglycerol (TG) stabilized Zinc Sulfide Quantum dots (ZnS QDs) in the hybrid electroluminescence (EL) device. Optical absorption spectroscopy clearly indicates the formation of narrow size distributed ZnS in the quantum confinement regime. X-ray Diffraction (XRD), Photoluminescence (PL), Energy Dispersive X-ray Spectroscopy (EDS) data supports the same. The hybrid EL device with structure of ITO (indium tin oxide)//PEDOT:PSS ((poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate)//HTL (α NPD- N,N'-diphenyl-N,N'-bis(1-naphthyl)-(1,1'-phenyl)-4,4'-diamine// PVK:ZnS QDs//ETL(PBD- 2-tert-butylphenyl- 5-biphenyl-1,3,4-oxadiazole)//LiF:Al (Device 1) was fabricated. Reference device without the ZnS QDs were also prepared (Device 2). The results show that the ZnS QDs based device exhibited bright electroluminescence emission of 24 cd/m2 at a driving voltage of 16 Volts under the forward bias conditions as compared to the reference device without the ZnS QDs, which showed 6 cd/m2 at ∼22 Volts. [ABSTRACT FROM AUTHOR]