Abstract: In view of the complex heat dissipation conditions of high-power power conversion system cabinets, a combined cooling method integrating efficient liquid cooling and reactor air cooling is adopted. By resolving several key issues, such as the heat dissipation design of water-cooled power modules for energy storage converter equipment, the internal layout of the overall electrical cabinet, the effective planning of stray heat dissipation air ducts inside the cabinet, the design of an independent air duct for the reactor, and the overall design of the water-cooled heat dissipation unit,the overall heat dissipation requirement of the high-power power conversion system cabinet is well met. Physical verification after the completion of the design, the heat dissipation effect is excellent, all 14 monitoring points inside the entire cabinet meet the design requirements and have a certain design margin.