Common-Mode Resonance Suppression Strategy in High-Speed Compressor Drive

Abstract

Two-phase current sampling has been widely employed in high-speed compressor drive for cost consideration. Meanwhile, a common-mode (CM) filter is preferred to suppress the CM $\mathrm{d}v/\mathrm{d}t$ introduced by switching devices. However, in such a system, CM resonance is brought into the armature currents, which deteriorates the armature currents and increases the torque ripples. This paper analyses the generation process of the CM resonance and proposes both hardware and software methods to suppress it, which are verified with simulation.