Recently, the SVC(Static Var Compensator) of HVDC(high-voltage direct current), which is actively researched with the development of renewable energy, can quickly control the connection and disconnection of parallel capacitors and reactors, It is a set of electrical devices that provide fast-acting reactive power with controlling parallel capacitors and reactors for stabilizing the power system. The SVC system has a large-scale water cooling system for removing the heat generated by the power semiconductor. In general, thermal flow analysis and cooling performance tests of some water cooling plate modules are performed to design this SVC water cooling system. In this study, thermal flow analysis of the large-scale water cooling system using CAE platform of the public cloud computing was performed on the SVC water cooling system and the pressure drop, flow characteristics and temperature distribution of the SVC water cooling system were analyzed. The basic design data applicable to SVC water cooling system was obtained.