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http://dx.doi.org/10.6113/TKPE.2022.27.4.339

Active Short Circuit Control Method to Reduce Overcurrent and Oscillation Current in PMSM  

Choi, Jong-Won (Dept. of Electrical and Electronic Engineering, Hannam University)
Kim, Yoon-Jae (Dept. of Electrical Engineering, Hoseo University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.27, no.4, 2022 , pp. 339-347 More about this Journal
Abstract
This study proposes the mitigation method for overcurrent and oscillation motor current in an active short-circuit operation. This operation is attracting attention as the safe state of electric vehicle traction inverters. However, the active short-circuit operation generates oscillation and overcurrent of motor currents during a transient state. The proposed method uses two different safe states in PMSM, such as active short circuit and freewheeling. The active short circuit is used for safe state in a steady state. To reduce the overshoot and oscillation, a freewheeling state is injected between active short-circuit operation by comparing the motor phase current with an analytically calculated steady-state motor current. Freewheeling state is only used in a transient state. The performance is demonstrated through simulations and experimental results. The peak current of the motor was reduced from 52 A to 40 A, and oscillation time was reduced.
Keywords
ASC(Active Short Circuit); Functional safety; Safe state; Freewheeling; Traction inverter; Electric vehicle;
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