FOUR-QUADRANT SPEED ESTIMATION BASED ON MODEL REFERENCE ADAPTIVE SYSTEM | ||||
| ERJ. Engineering Research Journal | ||||
| Article 6, Volume 28, Issue 2, April 2005, Page 169-177 PDF (772.41 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2005.69937 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Z. M. Salem; M. M. Khater; S. A. Kalilah; S. A. Mahmoud | ||||
| Electrical Engineering Department, Faculty of Engineering, Minoufiya University, Shebin El-Kom, Egypt | ||||
| Abstract | ||||
| Speed estimation methods for sensorless induction motor drives can be divided into two types. The first is based on acquiring data about fundamental components of stator currents and voltages. The second is based on the injection of high-frequency signals carried on stator voltages or currents.The latter type allows stable operation around zero frequency,and low speeds, However, besides its complexity, it increases the losses and torque ripple. The former type is difficult to operate at low speeds. In this paper, a modified speed estimation method of the first type is proposed to improve the performance of a sensorless vector controller. The proposed method is based on model reference adaptive control (MRAC) that uses the stator current and rotor flux as state variables for estimating the speed. In this method, the stator current error is represented as a function of first degree of the estimated speed error. Therefore, the proposed method beside offering a four quadrant operation, produces fast speed estimation and is robust to parameter variations. The superiority of the proposed method is verified by simulation | ||||
| Keywords | ||||
| Induction motor; sensorless cotitrol; Vector control; variables; observers; modeling; identification; adaptive tuning | ||||
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