Active Damping Stabilization for High-Speed BLDCM Drive System Based on Band-Pass Filter

The tight-speed regulation of the motor drive system can yield constant power load characteristics, which may lead to a negative admittance effect and destabilize the power supply. In order to overcome this problem, active damping compensation techniques have been widely used. However, the conventional active stabilization based on the low-pass filter combined with current reference injecting need a strong tradeoff between achieving effective active compensation and reducing the dynamic coupling. For this reason, a novel active damping compensation method based on the band-pass filter is proposed in this paper. The method is to feedback a portion of the dc-link voltage changes into the injecting nodes. Both the strategies of the current reference stage injecting and the voltage reference stage injecting have been analyzed. Simulation results show that the strategy of voltage reference injecting can avoid the coupling among system dynamics and the compensator. Finally, an experimental driveline platform based on the two identical high-speed magnetically suspended brushless DC motors coupling system is established. Experiential results verify the effectiveness of the proposed active stabilization method.