Open AccessQuick and seamless transition method for I‐f to sensorless vector control changeover and on‐the‐fly start of PMSM drives
Author(s) -
Nair Sandeep V.,
Hatua Kamalesh,
Durga Prasad N.V.P.R.,
Reddy D. Kishore
Publication year - 2020
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
ISSN - 1751-8679
DOI - 10.1049/iet-epa.2020.0387
Subject(s) - changeover , control theory (sociology) , rotor (electric) , stator , computer science , position (finance) , power (physics) , vector control , trajectory , control engineering , voltage , engineering , control (management) , induction motor , electrical engineering , physics , finance , quantum mechanics , artificial intelligence , economics , astronomy
A smooth changeover from the I‐f method to closed‐loop sensorless vector control is a critical requirement for permanent magnet synchronous motor (PMSM) drives using a back‐emf based sensorless algorithm for medium‐ to high‐speed range control. The existing methods provide a smooth transition by aligning the angle generated by I‐f control to the sensorless estimated angle. However, the overall start‐up time increases due to the additional transition interval, which limits the usability of these methods for applications requiring a quick start‐up. Furthermore, the use of a direct transition method to reduce the changeover time results in speed and current oscillation if the estimated position using sensorless algorithm is having an error. In the proposed method, the inverter pulses are disabled for a short duration and the machine back‐emf is measured after the stator current falls to zero. Therefore, a quick and seamless transition is achieved in the proposed method by accurately estimating the rotor position from the sensed back‐emf. The proposed method is also extended to perform on‐the‐fly start for power failure ride through during short time power supply interruption. The performance of the proposed method is verified using simulation and experiment on a 25 kW PMSM drive.