Research On Capacity Allocation And Energy Management For Diesel-battery Hybrid Power System

With the development of new energy technology and the improvement of hybrid power technology,rail transit,a new type of energy saving and environmental friendly rail transit vehicle,will become an inevitable trend of development.Diesel-battery hybrid power train relies on its unique power traction system,which is more environmentally friendly than traditional diesel locomotives,and more diverse than electric locomotives,and the cost of operation is more economical.It is the important premise of reasonable allocation of the capacity before realizing the fuel economy about the diesel-battery hybrid power train.In this paper,the application of different energy management strategies is further applied.Under the premise of meeting the demand of train power and energy demand,the optimal allocation of energy in hybrid power system is finally realized,and the overall efficiency of the system,as well the energy consumption level of hybrid electric train is improved too.This paper is aimed at the diesel electric hybrid train.First,the energy flow mode of the hybrid power system is analyzed.And then,from the degree of hybridization as well as the train running condition,the corresponding capacity configuration scheme is put forward,the fuel consumption and the economy of the battery system under different configuration are studied,what's more,the minimum capacity configuration and the reasonable scheme are obtained to meet the train power demand.By the second-hand development of ADVISOR simulation software,we build a simulation model for the diesel-battery hybrid power train and introduce the building process of power following control strategy,and the fuel consumption simulation of hybrid power system under typical train condition is completed as well.Further,the dynamic programming control strategy based on global optimal is applied to the simulation model,which is based on the state of charge of the power battery as the state variable,the output power of the diesel generator as the control variable and the loss of the hybrid power system as the optimization objective.Through the analysis and comparison of the results,if we use the dynamic programming control strategy of fuel consumption as the theoretical optimal value,the power following energy management strategy applied to the diesel-electric hybrid power train can achieve the fuel economy as better as well the previous.As for the power following energy management strategy is relatively simple,which is suitable for the rail transit area with relatively stable operation conditions,and can be used as an online control method of hybrid train energy management strategy.