Extending the speed range of super-high-speed electric air compressor based on erosion analysis of the stator voltage stability domain

Abstract

Abstract Fuel cell vehicles have high energy conversion efficiency, which can completely replace gasoline and diesel in fuel. The development of super-high-speed electric air compressor (SHSEAC) has become one of the important guarantees for the high power output performance of fuel cells. The maximum rotational speed and rotational speed fluctuation of the SHSEAC have become the key factors affecting the power output of the super-high-speed electric air compressor. When the SHSEAC reaches a certain limit during the actual speed-up process, it will enter the chaotic region, and the phenomenon of speed fluctuation will occur, which inhibits the maximum speed that can be achieved. The purpose of this paper is to study the influence of the d-axis stator voltage (Ud) and q-axis stator voltage (Uq) of the permanent magnet synchronous motor (PMSM) on the speed stability domain, and to suppress the speed fluctuation by optimizing the voltage stability domain, thereby expanding the speed range of the SHSEAC. First, the nonlinear dynamic model of the SHSEAC is established and the Ud and Uq balance points are calculated; secondly, the mutual erosion phenomenon of the Ud and Uq stability domains is revealed; finally, a stability migration control method based on rotational speed fluctuation is proposed. The experimental results show that after optimization, the speed fluctuation is reduced from 247.93 rpm to 18.56 rpm, and the maximum speed is increased from 152,155 rpm to 154,336 rpm.