Enhanced closed-loop scalar control of a three phase induction motor using estimated speeds
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Abstract
This paper presents a scalar control method for a three-phase induction motor with closed-loop speed estimation using the RF-MRAS scheme. Based on the estimated rotor speed and stator currents in the α-β reference frame, the rotor flux angle is determined to calculate the synchronous speed. The deviation between the synchronous speed and the estimated rotor speed is processed through a transfer function to filter out noise, thereby generating a slip-compensation speed that allows the motor to operate accurately at the reference speed without requiring a PI controller. This transfer function acts as a noise filter, effectively eliminating high-frequency components in the deviation between the synchronous and estimated rotor speeds. The control structure is developed and simulated in the MATLAB/Simulink environment. Simulation results showed that the proposed method enables accurate speed tracking, improved system stability, and faster dynamic response compared with the typical V/f control approach.
Tóm tắt
Trong bài báo này, một phương pháp điều khiển vô hướng vòng kín cho động cơ không đồng bộ ba pha sử dụng bộ ước lượng RF-MRAS đã được trình bày. Từ tốc độ rôto ước tính và dòng điện trong hệ tọa độ α-β, góc từ thông rôto được xác định để tính tốc độ đồng bộ. Sai lệch giữa tốc độ đồng bộ và tốc độ rôto ước tính được đưa qua một hàm truyền nhằm lọc nhiễu, từ đó tạo ra tốc độ bù trượt để động cơ có thể vận hành đúng với tốc độ tham chiếu mà không cần hiệu chỉnh qua khâu PI. Hàm truyền này đóng vai trò như một bộ lọc nhiễu, giúp loại bỏ các thành phần tần số cao trong sai số giữa tốc độ đồng bộ và tốc độ rôto ước tính. Cấu trúc điều khiển được xây dựng và mô phỏng trên phần mềm MATLAB/Simulink. Kết quả cho thấy phương pháp đề xuất có khả năng bám tốc độ tham chiếu, đảm bảo hệ thống vận hành ổn định cũng như thời gian đáp ứng so với phương pháp truyền thống.
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