Improved Super-Twisting Flux Sliding-Mode Observer for Sensorless IPMSM Drives with FFPS-PLL

• Published in: IEEE transactions on transportation electrification 2024-06, p.1-1
• Main Authors: Wu, Xuan, Hu, Xiaoni, Yu, Xu, Feng, Yuan, Wu, Ting, Huang, Shoudao
• Format: Article
• Language: English
• Subjects: Convergence; Couplings; finite-position-set phase-locked-loop (FPS-PLL); flux sliding-mode observer (FSMO); interior permanent magnet synchronous motor (IPMSM); Jitter; Phase locked loops; PI control; Rotors; sensorless; Stators
• ISSN: 2332-7782; 2332-7782
• DOI: 10.1109/TTE.2024.3414160

A novel position sensorless interior permanent magnet synchronous motor (IPMSM) drives strategy based on the improved super-twisting flux sliding-mode observer (ST-FSMO) and the fast finite-position-set phase-locked-loop (FFPS-PLL) is presented in this paper. Due to the characteristics of the sign function and linear sliding-mode surface, the rotor flux linkage estimated by conventional sign-function-based FSMO contains high-frequency jitter and the current estimation error cannot converge within a finite time. Regarding the above two problems, an improved ST-FSMO is proposed, in which the super-twisting algorithm with variable integral gain is designed and a second-order terminal sliding-mode (SOTSM) function, achieving the suppression of the jitter phenomenon and the finite-time convergence of the system state. Besides, regarded as an improved finite-position-set phase-locked-loop (FPS-PLL), an FFPS-PLL with excellent dynamic response is proposed, which firstly divides the rotor position region into eight sectors using the position octant method, and then only needs one calculation to obtain precise rotor position. The proposed FFPS-PLL can achieve fast dynamic response without adjusting parameters, with small computational burden and simplified implementation. Finally, the validity and feasibility of the proposed scheme have been demonstrated on the 1.5-KW IPMSM test platform.