Current Harmonic Suppression for High-speed Air Compressor based on Improved Discrete-time Current Controller and LC Filter

For the high-speed air compressor with low inductance, there exist severe current harmonic problem. In order to solve this problem, this paper proposes a novel current harmonic suppression scheme based on the improved discrete-time current controller and LC filter. LC filter is responsible for the high-order current harmonic suppression, while the remaining 2
^nd
and 4
^th
current harmonics are suppressed by the improved discrete-time current controller with bi-proper compensator. The compensator is adopted to correct the zeros and poles of the discrete-time current controller to adjust the system bandwidth, and in this way the low-order current harmonics can be suppressed. Finally, the effectiveness of the proposed method has been validated in the test bench of high-speed air compressor.