A Modified Direct Torque Control for Permanent Magnet Synchronous Machines (PMSMs)

This paper proposes a modified non-linear space vector modulated direct torque control (SVM-DTC) for permanent magnet synchronous machines (PMSMs) utilizing Lyapunov function-based methods. Feedback linearization and non-linear sliding mode control schemes have been widely utilized in PMSM control systems. However, the feedback linearization control rely on precise plant parameters and sometimes cancel some important nonlinearities, which may lead to instability of the system. Also, the non-linear sliding mode control has disadvantages of chattering (torque-ripple) phenomenon and torque fluctuations for load and parameter variations. In this work, a modified nonlinear SVM-DTC for PMSMs is proposed that has the advantages of reducing the chattering phenomenon and ensuring the stability of the system. The mathematical model of the proposed modified controller and its theoretical stability analysis are developed based on a Lyapunov function-type approach considering the complete machine dynamics. Simulations are carried out on a PMSM and its stability performance is analyzed against a broad spectrum of load and parameter variations.

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