Transient Electrothermal Simulation of a Power Distribution Unit During Charging–Discharging Cycles

Κατηγορίες:

A transient electro-thermal simulation of a Power Distribution Unit (PDU) was performed to evaluate temperature evolution during alternating current charging and discharging cycles. The analysis was carried out using the Thermal-Electric Coupled Field Transient capabilities in Ansys Mechanical. The simulation includes time-dependent electric current flow, Joule heating, and heat transfer, with switching between charging and discharging paths represented through changes in boundary conditions. Both operating modes are captured within a single transient analysis by sequentially modifying electrical loads, current paths, and material properties.

Details:

Technologies Used

Ansys Mechanical
Custom Snippets

Objective:

Simulate the electro-thermal behavior of a PDU during a full operating cycle that includes:

Charging phase with defined current input

Discharging phase with updated current paths

Transition between phases through contactor switching

Temperature-dependent material behavior

Challenge:

Simulating PDUs under alternating operating modes introduces several practical challenges:

Representation of contactor switching through boundary condition changes

Different electrical current paths for charging and discharging

Coupling between current density and Joule heat generation

Temperature-dependent electrical conductivity and thermal properties

Maintaining solution continuity across multiple operating phases

Solution:

A multi-step transient electro-thermal workflow was implemented in Ansys Mechanical using the Thermal-Electric Coupled Field analysis type.

The simulation is structured into consecutive phases within a single transient run:

1. Charging phase

Electric current applied through defined terminals
Joule heating computed from current density distribution

2. Switching phase (contactor operation)

Boundary conditions are modified to reflect opening/closing of contactors
Electrical connectivity and current paths are redefined

3. Discharging phase

Updated current paths and loads simulate discharge behavior
Thermal field continues evolving without reset

Key modeling features include:

Temperature-dependent electrical and thermal properties
Continuous time integration across all phases
Accurate computation of current density and volumetric heat generation
Fully coupled solution of electric potential and temperature fields

This workflow reproduces the real operational sequence observed in physical systems.

Conclusion:

The implemented transient electro-thermal workflow successfully captures the coupled behavior of electrical conduction and heat generation in a PDU during charging and discharging cycles.

The simulation provides the time evolution of temperature, current density, and voltage distribution during both charging and discharging phases.

The results capture the effect of changing electrical paths and operating conditions on thermal behavior, including the development of temperature gradients and localized heating within the PDU.

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