Identification of induction motor at standstill using artificial neural network

Influence of Nonideal Voltage Measurement on Parameter Estimation in Permanent-Magnet Synchronous Machines

“…If the compensation of VSI nonlinearity is not taken into account, it is evident from (19) that the estimated R=R a +∆R will be significantly larger than R a , wh ich is experimentally shown in Fig. 9(b).…”

“…Often on-line estimation of parameters is required so the controller parameters and system conditions can be updated, especially for sensorless control [1]- [5] and optimal PI controller design. Much literature has made contributions [4]- [19] to obtain parameters with d ifferent on-line estimat ion strategies fro m the measured machine electrical signals, such as the model reference adaptive system (M RAS) [4]- [7], recursive least square algorithms (RLS) [8]- [11], Neu ral Kan Liu, Z.Q. Zhu, Fellow, IEEE, Qiao Zhang, Member, IEEE, and Jing Zhang P Network (NN) technology [12], [15], [19], and extended Kalman filter (EKF) [13].…”

“…Much literature has made contributions [4]- [19] to obtain parameters with d ifferent on-line estimat ion strategies fro m the measured machine electrical signals, such as the model reference adaptive system (M RAS) [4]- [7], recursive least square algorithms (RLS) [8]- [11], Neu ral Kan Liu, Z.Q. Zhu, Fellow, IEEE, Qiao Zhang, Member, IEEE, and Jing Zhang P Network (NN) technology [12], [15], [19], and extended Kalman filter (EKF) [13]. For examp le, some literature proposes the use of the MRAS estimator to identify values of PMSM parameters, then utilized to improve the performance of sensorless control [4], [5].…”

“…Similarly, other literature proposes the use of the RLS estimator to identify values of PMSM parameters for imp roving the perfo rmance of sensorless control [8], [9]. In fact, existing methods for identifying the values of PM SM parameters [4]- [19], irrespective of the algorith m, such as MRAS, EKF, RLS and NN, etc., are emp loyed in these methods, the majority based on solving the PMSM equations by using measured stator currents and voltages.…”

“…Thus, since non-ideal voltage measurements usually exist, such as the DC bus voltage drop, zero shift in the amp lifier and voltage source inverter nonlinearities, the foregoing estimation strategies [4]- [19] should cooperate with an appropriate voltage measurement scheme to achieve high accuracy of estimation results. Otherwise, the accuracy of estimated parameters may suffer fro m the non-ideal voltage measurement.…”