Accuracy improvement of stator inductance identification method based on low-frequency current injection for three-level npc inverter-fed im drives in locked-rotor standstill conditionopen access
- Authors
- Khojakhan, Y.[Khojakhan, Y.]; Choo, K.-M.[Choo, K.-M.]; Yi, J.[Yi, J.]; Won, C.-Y.[Won, C.-Y.]
- Issue Date
- Feb-2021
- Publisher
- MDPI AG
- Keywords
- Regulation of angular speed; Standstill condition; Stator inductance identification
- Citation
- Electronics (Switzerland), v.10, no.4, pp.1 - 13
- Indexed
- SCIE
SCOPUS
- Journal Title
- Electronics (Switzerland)
- Volume
- 10
- Number
- 4
- Start Page
- 1
- End Page
- 13
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/25140
- DOI
- 10.3390/electronics10040488
- ISSN
- 2079-9292
- Abstract
- In this paper, a stator inductance identification process is proposed. The process is based on a three-level neutral-point-clamped (NPC) inverter-fed induction motor (IM) drive with a standstill condition. Previously, a low-speed alternating current (AC) injection test for stator inductance identification was proposed to overcome practical problems in conventional identification methods for three-level NPC inverter-based IM drives. However, the low-speed AC injection test-based identification method has some problems if a heavy load or mechanical brake is connected, as these can forcibly bring the rotor to a standstill during parameter identification. Since this low-speed testing-based identification assumes the motor torque is considerably lower in low-speed operations, some inaccuracy is inevitable in this kind of standstill condition. In this paper, the proposed current injection speed generator is based on the previously studied low-speed test-based stator inductance identification method, but the proposed approach gives more accurate estimates under the afore-mentioned standstill conditions. The proposed method regulates the speed for sinusoidal low-fre-quency AC injection on the basis of the instantaneous reactive and air-gap active power ratio. This proposed stator inductance identification method is more accurate than conventional fixed low-frequency AC signal injection identification method for three-level NPC inverter-fed IM drive systems with a locked-rotor standstill condition. The proposed method’s accuracy and reliability were verified by simulation and experiment using an 18.5 kW induction motor. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
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Collections - Information and Communication Engineering > School of Electronic and Electrical Engineering > 1. Journal Articles
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