Sensorless Feld-Oriented Control of a Permanent Magnet Synchronous Motor Based on Speed Sliding Mode Control and Fractional-Order PID Controllers in Current Loops Tuned by a Modified Particle Swarm Optimization Algorithm
Subject Areas : electrical and computer engineering
S. Khamisi Nasab
1
,
N. Erfani Majd
2
*
1 - Dept.of Elec. Eng., Shohadaye Hoveizeh Campus of Technology, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 - Dept.of Elec. Eng., Shohadaye Hoveizeh Campus of Technology, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Keywords: Sensorless field-oriented control, permanent magnet synchronous motor, fractional-order PID controller, modified particle swarm optimization algorithm,
Abstract :
This paper proposes a novel control strategy for the sensorless drive of a permanent magnet synchronous motor (PMSM), whose main innovation is the triple combination of Sliding Mode Control (SMC), Fractional-Order PID (FOPID) controllers, and a modified Particle Swarm Optimization (PSO) algorithm within a Field-Oriented Control (FOC) structure. In this approach, for the first time, SMC is used in the speed loop and FOPID controllers are simultaneously employed in the current loops and in a Model Reference Adaptive System (MRAS)-based speed estimator. Another innovation is the introduction of a modified PSO algorithm featuring a particle clustering mechanism, where weak particles are updated based on their distance from the trained best particle and distinct update rules are defined for each cluster. Performance evaluation under two scenarios (sudden load torque changes and reference speed changes) demonstrates that the proposed method reduces the maximum speed estimation error by up to 65%, improves the speed response settling time by up to 50%, and significantly reduces torque oscillations compared to classical PID control. This performance superiority stems from the inherent robustness of SMC against disturbances, the extra degree of freedom offered by FOPID controllers and the high accuracy of the modified optimization algorithm in tuning the coefficients.
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