Title :
A Prediction Error Method-Based Self-Commissioning Scheme for Parameter Identification of Induction Motors in Sensorless Drives
Author :
Jiayang Ruan ; Shanming Wang
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing, China
Abstract :
To avoid inconvenience caused by shaft rotation and improve immunity to measurement noises, an elaborately designed scheme is proposed for parameter identification of induction motors. After analyzing the responses of a simple step-voltage test, a sequence of pseudorandom signals, customized to excite abundant dynamics in the featured frequency band of the motor, are injected into the stator in a single-phase mode at standstill. The crucial feature of the proposed scheme is that a nonlinear procedure is introduced to minimize “predicted errors” of the estimation model, which lowers influences of measurement noises notably, and thus the design of low-pass filters is simplified greatly. Experimental comparisons are carried out, including not only tests on a squirrel-cage motor, but also extended tests on a wound-rotor motor to testify accuracy of rotor-side parameters, both using a real inverter. The results indicate that the proposed scheme is able to estimate parameters required by controllers accurately in the noisy environment, and improve performances of sensorless motor drivers.
Keywords :
induction motor drives; invertors; parameter estimation; predictive control; sensorless machine control; induction motors; inverter; parameter identification; prediction error method; pseudorandom signal sequence; rotor side parameter; self-commissioning method; sensorless drives; sensorless motor drive; shaft rotation; single-phase mode; standstill mode; Accuracy; Estimation; Induction motors; Noise; Noise measurement; Rotors; Stators; Excitation signal design; prediction error method (PEM); self-commissioning; sensorless control; single-phase test;
Journal_Title :
Energy Conversion, IEEE Transactions on
DOI :
10.1109/TEC.2014.2346198