Research On Optimization Of Energy Management Control For DEMU

With the rapid development of Chinese railway industry,EMU has become a widely accepted transportation.However,EMU trains are highly dependent on the contact network,single power supply,and harmonic pollution will be caused by regenerative braking.This thesis relies on the hybrid EMU project to develop the first intercity EMUs in China that use diesel-electric hybrid system.In the catenary installed area,the hybrid EMU operates in the same mode as the normal train,and the traction power supply system provides the energy required by the train.In areas where there is no contact or contact network,traction transformer and traction power converter will be breakdown,the hybrid EMU energy storage system is the main energy source of the train.It provides the required energy when the EMU is towing,and absorbs when the train braking.This thesis takes the traction characteristics and energy demand of the hybrid EMU as the starting point.By analyzing the traction characteristics of the train,the capacity configuration of the hybrid system is proposed.The working characteristics of the various components of the hybrid system are introduced.According to the actual operating conditions and traction characteristics of the hybrid EMU,the appropriate energy management control strategy is developed.The rule-based instantaneous power control strategy is common to implement,and the energy management is based on the working characteristics of the diesel generator set and the power battery pack.The control of the diesel generator set adopts a combination of fixed speed control and hysteresis control.The power battery pack adopts a combination of charge and discharge control based on droop control and hysteresis control.The energy management strategy simulation is verified that the rule-based instantaneous power control strategy can operate stably in the hybrid system,realize the power distribution of the two power sources,and control the flow direction of the energy.According to the relatively fixed operating characteristics of the hybrid EMU,the fuzzy control is selected as the energy management optimization control method of the hybrid EMU.According to the operating characteristics of the hybrid EMU,the suitable hybrid power is determined based on the rule-based energy management control.The fuzzy logic rules of the system determine the fuzzy variables,the membership functions,and the universe and fuzzy subsets of the fuzzy variables.The model of the hybrid EMU is established in ADVISOR,,and the typical operating conditions of the hybrid EMU are selected as the simulation conditions.The power distribution under the two control modes,the change of the SOC of the power battery pack and the fuel consumption curve of the diesel generator set are obtained.The simulation results are verify that fuzzy control has lower feul use and higher fuel efficiency,can be an energy management optimization strategy for hybrid EMUs compared with rule-based instantaneous power control strategies.At the same time,the experimental waveforms of the hybrid EMU under the rule-based instantaneous power control are analyzed,and the instantaneous power control is verified,which provides the basis for the fuzzy control to realize on the hybrid EMU.There are 67 figures,17 tables and 53 citied references in this thesis.