High Precision Online MTPA Algorithm Considering Magnet Flux Parameter Mismatch for a PMa-SynRM

Li, Dongyang; Wang, Shuo; Gu, Chunyang; Bao, Yuli; Zhang, Xiaochen; Gerada, Chris; Zhang, He

Abstract

To improve the controlled current angle accuracy and reduce the copper loss for a Permanent Magnet assisted Synchronous Reluctance Machine (PMa-SynRM), this paper proposes an online Maximum Torque per Ampere (MTPA) control strategy based on Virtual High-Frequency Signal Injection (VHSI) to find its control current angle. The proposed method considers the nonlinear characteristics of the d- and q-axis inductance, d- and q-axis flux linkage, and permanent magnet flux. An error was identified in the mathematical determination of the MTPA control angle, stemming from the omission of the inductance's dependency on the current angle in the analysis. To solve the problem, an improved error supplementary control strategy considering permanent magnet flux mismatch was proposed, which features a lower calculation burden, less motor parameters information required, and higher precision. In this process, only permanent magnet flux information needs to be identified. The proposed MTPA detection and its supplementary control scheme was analyzed from mathematical derivation and verified by experiments.

Citation

Li, D., Wang, S., Gu, C., Bao, Y., Zhang, X., Gerada, C., & Zhang, H. (2024). High Precision Online MTPA Algorithm Considering Magnet Flux Parameter Mismatch for a PMa-SynRM. IEEE Transactions on Energy Conversion, 1-12. https://doi.org/10.1109/tec.2024.3469948

• Journal Article Type: Article
• Acceptance Date: Oct 15, 2024
• Online Publication Date: Oct 15, 2024
• Publication Date: Oct 15, 2024
• Deposit Date: Jan 29, 2025
• Publicly Available Date: Jan 30, 2025
• Journal: IEEE Transactions on Energy Conversion
• Print ISSN: 0885-8969
• Electronic ISSN: 1558-0059
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Pages: 1-12
• DOI: https://doi.org/10.1109/tec.2024.3469948
• Keywords: Inductance , Torque , Magnetic flux , Saturation magnetization , Permanent magnets , Table lookup , Stators , Couplings , Vectors , Resistance
• Public URL: https://nottingham-repository.worktribe.com/output/40705698
• Publisher URL: https://ieeexplore.ieee.org/document/10719670