Thermal Management of High Density Power Electronics Modules Using Dielectric Mineral Oil With Applications in the Electric Utility Field for Smart Grid Protection

Abstract

The thermal management of high density power electronics can be extremely challenging due to high power loads paired with small device footprints. When these power electronics are used in systems, which require extremely high reliability, the design of the thermal abatement system takes on increasing importance. In this study, the thermal response of a solid state fault current limiter is analyzed in steady-state and failure mode to develop a thermal solution which is both economical and reliable. The solid state fault current limiter is used in electric distribution systems to prevent a current surge from reaching sensitive equipment downstream of a power plant in the event of a disturbance on the line. A parametric study on several design variables including power loading, device spacing, and system flowrate is completed to give insight into the development of an optimal design. A coldplate design using dielectric mineral oil, which minimizes both system footprint and operating cost, is developed. This analysis and thermal management solution is applicable not only to this situation but also to the other high density power electronics applications.