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An Enhanced Digital Current Controller Based on Complex Pole Placement With Active Decoupling for High-Speed PMSM
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DOI：10.1109/tie.2026.3684174.png)
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Abstract
En 中文
The closed-loop bandwidth of permanent magnet synchronous motor (PMSM) drives is severely constrained by stability requirements under high-speed, low switching-to-fundamental-frequency ratio (SFR) operation. To overcome this limitation, this article proposes an enhanced digital current controller based on complex pole placement with active decoupling for high-speed PMSM. The distribution pattern of poles in the internal model control (IMC) system is revealed. It is theoretically validated that, within the IMC framework, the enhancement of the current loop bandwidth and the maintenance of closed-loop stability are mutually restrictive and cannot be independently regulated. By constructing a damping modulation loop and embedding the complex pole placement with active decoupling function into the forward path, targeted regulation of the low-damping poles in the control system is achieved. This enables the proposed controller to possess the capability for coordinated regulation of the current loop gain and the dominant closed-loop poles. Comprehensive performance evaluation of the proposed control strategy is conducted on an experimental prototype. The proposed control system maintains robust high-speed operation even under extreme conditions with an SFR as low as 10. Furthermore, it achieves a synergistic enhancement in both dynamic response and disturbance rejection across a wide speed range from 0 to 60 000 r/min.
Keywords:
Complex pole placement with active decoupling
enhanced digital current controller (EDCC)
high-speed permanent-magnet synchronous motors
low switching-to-fundamental-frequency ratio (SFR)
Journal
IF:
7.2
Papers:
1.8W
Citations:
9.8W
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Cited Papers