Abstract: With the deepening of aerodynamic research, as an important experimental equipment of air or ground vehicles, wind tunnel plays a more and more important role in scientific research and engineering design represented by vehicle noise index. With the deepening of aerodynamic research, as an important experimental equipment of air or ground vehicles, wind tunnel plays a more and more important role in scientific research and engineering design represented by vehicle noise index. As the driving equipment of the main engine of the aerodynamic ground testbed, the medium voltage driver has high performance requirements, which is mainly reflected in the speed accuracy,torque response, braking capacity and so on. Taking the research on the medium voltage driver of the main engine of the wind tunnel as an example, this paper establishes the working condition model of the main engine of the wind tunnel, and puts forward the energy consumption braking scheme of the frequency converter unit through the research on the lifting speed and idling time. The simulation experiments based on the above work verify the technical reliability of the wind tunnel host frequency converter, which can be used as a reference for the scheme design of the braking system of related products.