Stability enhancement optimization method for suppressing speed fluctuation under large-scale speed regulation process of super-high-speed electric air compressor

As a core component of fuel cell systems, a super-high-speed electric air compressor plays a decisive role in effective operation of fuel cell system. A super-high-speed electric air compressor must have high speed and high response abilities. At the same time, super-high-speed electric air compressor should have lower speed fluctuations in order to prevent excessive pressure pulsation damage to the stack. To solve this problem, firstly, mathematical model of super-high-speed electric air compressor is established considering rotation dynamics. Secondly, considering the influence of load torque on system dynamics, Hopf bifurcation theory is used to reveal influence of the load torque on the stability domain of voltage reference. Finally, according to the results of dynamic theory analysis, a stability enhancement optimization method is proposed, and controller design of the air compressor is carried out. The obtained results show that the proposed method effectively suppresses speed fluctuations in the process of large-scale speed regulation.