Research on Energy Management Strategy for Dual-Planetary Hybrid Electric Bus Based on Dynamic Programming
In order to solve the problem that the cost function value of the traditional Dynamic Programming(DP)strategy of the hybrid power system is greatly affected by the penalty function and the balance electric power debugging time is too long,the vari-able penalty coefficient Dynamic Programming(DP-VAR)strategy and the boundary iterative Dynamic Programming(DP-ITE)strategy are proposed for a dual-planetary hybrid electric bus.At the same time,a dynamic programming mode switching rule ex-traction method based on XGBoostalgorithm is proposed,and the Adaptive Equivalent Fuel Consumption Minimization Strategy(A-ECMS)is improved,and an A-ECMS with mode switching rules is established.The simulation results based on C-WTVC cy-cle show that:(1)Compared with DPstrategy,the control rules of DP-VAR and DP-ITE strategies are clearer,and the fuel con-sumption is reduced by 1.18%and 4.31%respectively;(2)DP-ITE strategy has absolute convergence of termination SOC on the premise of canceling penalty function;(3)The optimized A-ECMS strategy reduces fuel consumption by 1.17%compared with that before optimization.
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