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ABSTRACT: Electrical energy storage system plays an important role in hybrid electric vehicles. In this paper a simulation model for battery/ultra-capacitor hybrid energy storage system is presented by using energetic macroscopic representation (EMR). Based on the model a control strategy for the hybrid energy storage system is developed with a goal of improving battery life and increasing the performance of HEV drive train. The simulation results under different urban driving cycles show the validity of the model.
Vehicle Power and Propulsion Conference, 2009. VPPC '09. IEEE; 10/2009
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ABSTRACT: Combination of battery and ultracapacitor as energy storage of hybrid electric vehicles is considered a good way to improve overall vehicle efficiency and battery life. Coordinated power distribution and bi-directional DCDC converter control are challenges. Method to determine distribution of ultracapacitor and battery is proposed based on a specific hybrid electric bus. A bi-directional DCDC converter is interface of two energy storage to control power flow. Metrics of converter are determined from vehicle simulation. To downsize the converter and get high efficiency, bi-directional DCDC converter operates under complementary DCM condition and soft-switching.
Vehicle Power and Propulsion Conference, 2009. VPPC '09. IEEE; 10/2009
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ABSTRACT: The key of magnetic-resonance based wireless energy transfer technology (MRBWET) is the magnetic coupling system which composed of driving and receiving coils, of which the mathematical model is important to the research of the transmission principle and the optimization of mechanism structure and parameters. Based on calculating the radiation level of typical coil, a magnetic-coupled-coil model was built based on analyzing the magnetic dipole used in the experimental system. According to the model, the quantitative relationship between the power contained in the receiving coil and parameters of resonances was discussed. The optimization method of parameters matching for maximal power transfer is proposed. Simulation and experimental results validate the correction and feasibility of the theoretical analysis.
Vehicle Power and Propulsion Conference, 2009. VPPC '09. IEEE; 10/2009
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ABSTRACT: Wireless energy transfer based on coupled magnetic resonances is a new technology which energy can be transferred via coupled magnetic resonances in the non-radiative near-field. A simple energy transfer system structure was proposed in this paper. Based on this structure, the back electromotive force (back-EMF) in the receiving coil related with different transfer distance and with driving frequency was simulated and analyzed. Experimental results shows that the power can be transmitted is up to 50 W, the transfer efficiency is more than 60%, the distance of energy transfer is longer than 1 meter. The energy transferring is able to go through various non-metallic objects. The prospective applying fields are wide, such as EV charging, industrial robot, aerospace, wireless sensor networks, and RFID technology.
Vehicle Power and Propulsion Conference, 2008. VPPC '08. IEEE; 10/2008
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ABSTRACT: Today, more and more problems have been arisen in hybrid electric vehicles (HEV). It has been shown that none of any energy sources can solely fulfil all the demands of HEV in some circumstances. Hybrid energy sources become one alternative solution. This energy storage technology has also become one trend of HEV propulsion sources recently. In this paper, typical hybridization types, the application and the future trends about hybrid energy sources were discussed.
Vehicle Power and Propulsion Conference, 2008. VPPC '08. IEEE; 10/2008
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ABSTRACT: Aiming at the practical applications of novel wireless energy transfer, the mathematical model for wireless energy transfer devices based on intermediate frequency resonant is established in this paper. Based on the electromagnetic fields sine-band theory, the transfer scheme using lumped parameters is designed. It is proved that using the resonator with a high quality factor value and coupling coefficient matched resonant frequency leads to a bigger transfer energy and a longer distance. A correction method in this band is proposed based on the analysis of the resonator characteristics in the intermediate frequency electromagnetic field. The method makes it possible to transfer more energy over a longer distance. It is demonstrated that about 23 W electric power can be transferred with the distance of 0.7 m in the experiment.
Vehicle Power and Propulsion Conference, 2008. VPPC '08. IEEE; 10/2008
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ABSTRACT: In this paper the development of an electric bus with super-capacitors as unique energy storage is proposed. Super-capacitor has the advantage of quick charge, large power density and long cycle life. The super-capacitor bus is suitable for using in city and the drive distance between two terminals is within 20 km. Its advantage is the capability of frequently start/stop, accelerate and decelerate. Especially, in low temperature the characteristic of super-capacitor is better than that of the chemistry battery. This feature makes it the best choice in the cold area. This project is supported by the government of Heilongjiang province, China. The power of the super-capacitor stacks is 14 kWh, and the voltage range is 160 V-320 V. The maximal speed is 50 km/h. A permanent magnetic motor and a two quadrant IGBT chopper controller are developed. The rating power of the motor is 60 kW and the transient power is 90 kW. Because of the short duration of charging the super-capacitor stacks (about 15 minutes) this kind of electric bus can be used in 24 hours. The performance and the principle details are described in the paper
Vehicle Power and Propulsion Conference, 2006. VPPC '06. IEEE; 10/2006
