Composite Power is a new vehicle energy storage system, usually by two or more single power supply, such as batteries, super capacitors, fuel cells and other DC-DC Converter with the composition. It can give full play to the high specific energy batteries, super capacitors with high specific power advantages in the vehicle driving conditions change, play a driving power supply and braking energy recovery effect. On the one hand, it can extend the battery life and reduce the cost of vehicle energy storage systems, improve the economics of car use; the other hand, it can maximize the recovery of braking energy, reduce fuel consumption, to achieve energy saving carspurposes. This paper is State Key Laboratory of Automobile Dynamic Simulation Open Fund "based on switched reluctance motor vehicle control method of regenerative braking system" (20091107) and Jiangsu Province Key Laboratory of Automotive Engineering Foundation "electric vehicles, renewable energy storage Experimental Study of braking system "(QC2006-06) an important part, focusing on simulation test bed for regenerative braking to improve composite power supply design, optimization, control and test validation, the specific contents are as follows: 1. on the battery performance testing, Analysis of experimental data obtained through the open circuit voltage of the battery, the equivalent resistance with the SOC (State of charge, referred to as SOC) curve, and then in the MATLAB / Simulink simulation model to create the battery, and off-line identification using partial least squares model parameter; after the establishment of a super capacitor RC equivalent circuit simulation model. 2. On the battery SOC estimation of the main factors analysis, based on Coulomb efficiency, temperature and aging compensation SOC amendment expression, and then based on extended Kalman filter algorithm to establish the battery SOC estimation model, simulation results show that: This method can effectively resist the noise SOC interference and elimination of accumulated error; after the establishment of a super capacitor SOC estimation model, which can limit the over-charging and discharging single super capacitor, super capacitor to improve the overall efficiency. 3. On the vehicle performance DC-DC converter needs analysis, selection cascaded bidirectional DC-DC converters for energy storage test match in Taichung, and the design parameters of circuit components; after the establishment of the use of SimPowerSystems DC-DC module library converter simulation model, the results show that: IGBT tube voltage drop on the DC-DC converter power loss greatly. 4. ECE driving cycle based on the vehicle driving power demand analysis, selection of a simulation model calculates the motor rated power and peak power, and to determine the number of batteries and super capacitors monomer; after the analysis of complex power mode, and Finite state machine based on the theory and Stateflow block library to establish the energy complex power management strategy; final package after each module to establish vehicle simulation model, simulation results show that: in the ECE driving cycle conditions, the super-capacitor battery can play a "clipping valley filling "role; composite power supply to meet the power demand when the car accelerated, and the recovery of braking energy is better able to meet the use of regenerative braking test stand requirements.
Key words: regenerative braking, complex power, state of charge, DC-DC converter, energy management strategy
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