Fuzzy Logic Based Zero Direct-Axis Current Control Of PMSM Drives

Abstract

This paper presents the simulation of fuzzy logic-based controller for zero direct axis current control of Permanent Magnet Synchronous Motor(PMSM). The PMSM has been widely employed in low to medium power systems because of its improved efficiency, high torque to weight ratio, excellent stability, and rapid dynamic performance. With the introduction of one of vector control methods i.e. ZDC, PMSM can be operated in the same manner as separately excited dc motors to accomplish high-performance. Traditionally ZDC of PMSM drives is reported using linear proportional integral(PI) controllers in current literature. But these controllers, on the other hand, induce torque and current distortions, as well as limit steady-state accuracy. These flaws are solved by using a fuzzy controller. The Fuzzy controller overcomes the complexity of PI controller tuning as well as the high response time. With minimal mathematical calculations, it also provides fast response time, high accuracy and low design complexity. To substantiate the superiority of FLC over conventional PI ZDC controller, an investigation is carried out on closed-loop speed regulation of PMSM drive. The system under consideration is tested for various dynamic test profiles consisting of varying speed and load torque. MATLAB-Simulink is used for the proposed system’s design, simulation, and performance analysis. The results obtained show that the suggested fuzzy ZDC controller outperforms the standard PI ZDC controller in terms of dynamic performance and design complexity.