Achieving the “Dual Carbon” targets will require a gradual replacement of traditional fuel vehicles with new energy vehicles in the transportation industry. Nonetheless, the preponderance of electricity employed in the operation of new energy vehicles is derived from thermal power generation, a process that essentially entails the combustion of fossil fuels. This approach has been demonstrated to be ineffective in achieving a significant reduction in carbon emissions. Therefore, the present paper proposes a zero-carbon energy supplymentation system. Firstly, the system composition and the functions of each part are introduced. Secondly, the power rating matching of solar power generation system and fuel cell power generation system is conducted because it is imperative to enabling zero-carbon operation of this system. A thorough examination of the system operational mode is ultimately undertaken. The findings indicate that under specific environmental and external conditions, the system has the capacity to attain zero-carbon operation within a designated power range.