Abstract
This study proposes a novel hierarchical nonlinear proportional-integral fast terminal sliding mode (HNLPIFTSM) control for permanent magnet synchronous motor (PMSM) speed regulation system. A new type of sliding surface called HNLPIFTSM surface, which combines the benefits of a nonlinear proportional-integral (PI) sliding mode surface and a fast terminal sliding mode (FTSM) surface, is proposed to enhance the robustness and improved the dynamic response, whilst preserving the great property of the conventional hierarchical fast terminal sliding mode (HFTSM) control strategy. The proposed HNLPIFTSM surface uses the novel nonlinear PI sliding mode surface as its inner loop and uses the FTSM surface as its outer loop. Meanwhile, an extended state observer (ESO) is used to estimate the uncertain terms of the PMSM speed regulation system. Furthermore, the stability of the closed-loop control system under the ESO and the HNLPIFTSM control strategy is proved by the Lyapunov stability theorem. Finally, the simulations and experimental demonstrations verify the effectiveness and superiorities of our proposed HNLPIFTSM control strategy over the conventional HFTSM control strategy.
Highlights
Sliding mode (SM) control strategy is a common robust control method, which was proposed by former Soviet scholars in the 1950s
Motivated by the above analysis and previous studies, a novel hierarchical nonlinear proportional-integral fast terminal sliding mode (HNLPIFTSM) control strategy is proposed for the permanent magnet synchronous motor (PMSM) speed regulation system in the present work
The selected parameters of the traditional hierarchical fast terminal sliding mode (HFTSM) control strategy and the proposed HNLPIFTSM control strategy in the simulation are given in Tables 2 and 3, respectively
Summary
Sliding mode (SM) control strategy is a common robust control method, which was proposed by former Soviet scholars in the 1950s. Motivated by the above analysis and previous studies, a novel hierarchical nonlinear proportional-integral fast terminal sliding mode (HNLPIFTSM) control strategy is proposed for the PMSM speed regulation system in the present work. 2. The combination of the FTSM surface with the nonlinear PI sliding mode surface is used to design a novel HNLPIFTSM control strategy.
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