Current measurement gain tuning for interior permanent magnet synchronous motor (IPMSM) drives using controlled short circuit tests

Abstract

This paper presents a nonintrusive method to automatically identify and compensate for current measurement errors in interior permanent magnet synchronous motor (IPMSM) drives. Each IPM motor has a distinct short-circuit current vs. speed characteristic, which is solely defined by its machine design. By controlling the IPM motor to operate at its steady-state short-circuit current during coasting down, all phases of the IPM motor can be safely short circuited using the inverter without introducing any current transients. Then the dq axis currents measured by the inverter are compared with the known short-circuit characteristic of the IPM motor. The distortion pattern in the d-q axis currents contains all the information needed to correct for current sensor errors in IPMSM drives.

Current Sensors Offset Fault Online Estimation in Permanent Magnet Synchronous Generator (PMSG) Drives for Offshore Wind Turbines

“…Usually, a three-phase PMSG drive are equipped with one DC link and three-phase current sensors [8][9][10]. The offset faults of the phase-current sensors will degrade the system performance and even lead to system shutdown [11][12][13][14][15][16][17][18][19][20][21]. To be specific, the offset faults of the phase current sensors will introduce torque ripples with the fundamental operation frequency, which might a significant increase in harmful vibration of the system and thus eventually affecting the operating lifespan period.…”