The paper introduced an advanced real time optimization algorithm-ECMS, and used in parallel hybrid electric vehicle (PHEV). The mathematical model of vehicle’s backward simulation is established firstly. On the basis of the mathematical model, the requirement of the global optimal strategy is obtained by the hybrid energy management strategy which is derived by Pontryagin minimization principle (PMP), and analyzed the problems that need to be solved when the PMP is used to obtain the global optimal solution. In order to simplify the problems, equivalent consumption minimization strategy (ECMS) is used to approximate PMP.
In this paper, based on the discussion of the multi-layer composite insulation structure and interface in the dry glue impregnated paper sleeve, the expressions of interface charge and field strength in the double-layer composite medium are deduced by using Maxwell equation and corresponding boundary conditions. The three-layer composite medium is discussed by expanding the formula system. The theoretical calculation results show that there is interaction between three-layer composite media, and the distortion of space charge and electric field is much larger than that in double-layer composite media. Further, the allowable field strength of the outgoing line device at the tail of the converter transformer under various operating conditions is analyzed, the finite element simulation calculation model of the typical outgoing line structure is established, the transient potential and electric field distribution characteristics of the outgoing line device are discussed under various voltage types such as polarity reversal, and the insulation margin value of the critical path is obtained by combining the allowable field strength. The allowable field strength and insulation structure design of outgoing line device are proposed, which can provide reference for the design of outgoing line structure of converter transformer.
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