Abstract—This paper presents a simp

Abstract—This paper presents a simple flux regulation for a direct torque control (DTC) of induction motor (IM), to improve speed and torque estimations at low and zero speed regions. To accomplish this, a constant switching frequency controller (CSFC) is used to replace the3-level hysteresis torque comparator of a DTC IM. The DTC of IM utilizing CSFC (DTC-CSFC) retains the simple structure of a look-up table based DTC drive. With DTC-CSFC, constant switching frequency is maintained, and at the same, the flux droop problem that normally occurs in DTC with the hysteresis controller (DTC-HC) at low speed is solved; subsequently, the stator flux and torque estimations at low speed are also improved. In the proposed system, the speed feedback for the closed loop speed control is estimated using an extended Kalman filter (EKF), which requires heavy real-time computation. However, due to the simple structure of DTC- CSFC, small sampling time, hence large control bandwidth is possible. The performance of the speed sensorless DTC-HC and DTC-CSFC are compared experimentally under different operating conditions. With the improved stator flux regulation, experimental results of the DTC-CSFC showed a significant improvement in speed and torque estimations at very low and zero frequency operations.

Kết quả (Anh) 1:

Abstract — This paper presents a simple flux regulation for a direct torque control (DTC) of induction motor (IM), to improve speed and torque at low speed and zero estimations regions. To accomplish this, a constant switching frequency controller (CSFC) is used to replace the3-level torque hysteresis comparator of a DTC IM. The DTC of IM utilizing CSFC (DTC-CSFC) retains the simple structure of a look up table based DTC drive. With DTC-CSFC, constant switching frequency is maintained, and at the same, the flux droop problem that normally occurs in DTC with the hysteresis controller (DTC-HC) at low speed is solved; subsequently, the stator flux and torque estimations at low speed are also improved. In the proposed system, the speed feedback for the closed loop speed control is estimated using an extended Kalman filter (EKF), which requires heavy real-time computation. However, due to the simple structure of DTC-CSFC, small sampling time, hence large bandwidth control is possible. The performance of the speed sensorless DTC-HC and DTC-CSFC are compared experimentally under different operating conditions. With the improved stator flux regulation, experimental results of the DTC-CSFC showed a significant improvement in speed and torque estimations at very low and zero frequency operations.

Kết quả (Anh) 2:

Abstract This paper presents a simple-flux regulation for a direct torque control (DTC) of induction motor (IM), speed and torque estimations To improve low and zero speed at vùng. To Accomplish this, a constant switching frequency controller (CSFC) is used to replace the3-level comparator hysteresis torque of a DTC IM. The DTC of IM utilizing CSFC (DTC-CSFC) retains the simple structure of a look-up table based DTC drive. With DTC-CSFC, constant switching frequency is maintained, and at the same, the flux droop mà thường problem with the hysteresis Occurs DTC print controller (DTC-HC) is solved at low speed; subsequently, the stator flux and torque at low speed estimations cũng improved. In the proposed system, the speed feedback for the closed loop speed control using an extended Kalman is Estimated filter (EKF), mà requires heavy real-time computation. Tuy nhiên, Due to the simple structure of DTC- CSFC, small sampling time, bandwidth control is possible The Hence large. The performance of the speed sensorless DTC-HC and DTC-CSFC are under Different Operating Conditions sánh experimentally. With the improved stator flux regulation, experimental results of the DTC-CSFC the significant improvement showed a print speed and torque at very low and zero estimations operations frequency.