Liu, Xing; Yang, Hui; Cai, Shun; Asef, Pedram; Wang, Yunchong; Lin, Heyun; Yu, Feng; (2025) Improvement of Q-Axis Current Control for Magnetization State Manipulations of Variable-Flux Memory Machines Based on FCS-MFPCC. In: (Proceedings) Energy Conversion Congress & Expo Europe (ECCE Europe 2025). IEEE (In press).

Text Final_Control_VFMM.pdf - Accepted Version Access restricted to UCL open access staff until 8 March 2026. Download (925kB)

Abstract

Variable-flux memory machine (VFMM) has received increasing attention thanks to the attractive characteristic of adjustable permanent magnet (PM) flux. The magnetization state (MS) manipulation in VFMM extensively complicates the current controller design. In particular, the q-axis current is nearly out of control during MS manipulations due to d-axis current injection, when applying predictive control methods to VFMM drives. A thorough analysis of this issue reveals that the q-axis component of cost function fails to influence the optimal voltage vector selection due to its extremely low weightiness. Subsequently, two solutions are proposed: introducing a weighting factor and imposing additional constraints. Accordingly, a dual-mode FCS-MFPCC strategy is proposed, which incorporates the two solutions during MS manipulations. Finally, the proposed strategy is verified through simulations. The results show that the q-axis current can track its reference with negligible errors during MS manipulating operations by using the proposed solutions.

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