With the rapid development of flexible HVDC transmission technology

the clamping IGBT element is used more and more in the field of high voltage and high power flexible HVDC converter valve due to its advantages of double-sided heat dissipation and strong power cycle capability.The power module based on the clamping IGBT element

as the core equipment of flexible HVDC converter valve

is a complex multi-physical field environment with mutual coupling of electromagnetic field

temperature field and structure field.The power module is subjected to interactions of such multiple physical fields as electricity

magnetism

heat and force during operation.The eddy current and electromagnetic force in the structural parts such as the chassis

the copper row and the silicon stack are generated due to the powerful alternating electromagnetic field.The heating of eddy current and element loss make the temperature of the power module rise in operation and affect the operating reliability of the power module.Moreover

inside of the clamping IGBT element is a mostly multi-chip parallel structure.The requirement to the clamping structure is higher in order to assurance uniform stress

uniform flow and uniform heat dissipation of each chip structure.Therefore

the influence of such factors as eddy current

element loss

water cooling

electromagnetic force

thermal stress and mechanical stress on the power module of the clamping IGBT element must be comprehensively consid ered.In this paper

a kind of multi-physical field coupling simulation analysis method for the power module of flexible direct converter valve based on a kind of clamping IGBT element is proposed in combination with Ansys finite element analysis software.Firstly

the coupling relation of such multi-physical field as electromagnetic

thermal and force is analyzed by constructing a mathematical model of multiple physical fields coupling relationship.Secondly

the multi-physics field coupling analysis of electromagnetic-thermal-fluid and electromagnetic-thermal-force for power module of the converter valve is carried out respectively and the loss

temperature

electromagnetic force

thermal stress

general stress and shape variables of the power module are obtained.Finally

the results of electromagnetic-fluid-temperature coupling are compared and verified with the test result of power module results of the power module

proving that the multi-physical field coupling analysis method of the converter valve can guide the design of the power module of the converter valve.