Title: MTPA real-time tracking method based on AC signal injection

Authors: Ningzhi Jin; Hongchao Chen; Zhiqiang Wu; Long Zhang; Jiaxin Jiang

Addresses: Engineering Research Centre of Automotive Electronics Drive Control and System Integration, Ministry of Education, Harbin University of Science and Technology, Harbin, Heilongjiang, China ' Engineering Research Centre of Automotive Electronics Drive Control and System Integration, Ministry of Education, Harbin University of Science and Technology, Harbin, Heilongjiang, China ' Engineering Research Centre of Automotive Electronics Drive Control and System Integration, Ministry of Education, Harbin University of Science and Technology, Harbin, Heilongjiang, China ' Engineering Research Centre of Automotive Electronics Drive Control and System Integration, Ministry of Education, Harbin University of Science and Technology, Harbin, Heilongjiang, China ' Engineering Research Centre of Automotive Electronics Drive Control and System Integration, Ministry of Education, Harbin University of Science and Technology, Harbin, Heilongjiang, China

Abstract: In the actual control of Interior Permanent Magnet Synchronous Motor (IPMSM), the electrical parameters often fluctuate due to magnetic saturation and temperature change and therefore it is impossible to achieve an accurate control. Aiming at parameter changes, a new real-time tracking method for Maximum Torque Per Ampere (MTPA) trajectory of permanent magnet synchronous motor is proposed. The angle information corresponding to the MTPA current is extracted by introducing a new MTPA reference frame, infusing it with appropriate high-frequency AC signal components, analysing the internal relationship between the electromagnetic torque pulsation component and the current vector angle under the new MTPA reference frame, and then configuring reasonable cut-off frequencies of low-pass and band-pass filters. At the same time, compared with the traditional injection method, it is not necessary to inject high-frequency current angle into the vector angle and when the system is stable, it can be injected intermittently to reduce losses. Thus, accurate and efficient control can be achieved without parameter identification. The simulation results verify the feasibility and effectiveness of the proposed control algorithm.

Keywords: maximum torque per ampere; AC signal injection; MTPA reference frame; IPMSM; indirect measurement torque.

DOI: 10.1504/IJVAS.2022.133009

International Journal of Vehicle Autonomous Systems, 2022 Vol.16 No.2/3/4, pp.161 - 179

Received: 26 Jan 2022
Received in revised form: 09 Jun 2022
Accepted: 23 Oct 2022
Published online: 24 Aug 2023 *

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