Using PWM-Induced Transient Excitation and Advanced Signal Processing for Zero-Speed Sensorless Control of AC Machines

The sensorless control of induction machines, particularly for operation at low speed, has received significant attention in recent years. To realize a field-oriented control of AC machines that is able to work at zero speed, the most commonly used methods are either sensor-based models or transient-signal-excitation methods. The major disadvantage of present signal-injection methods is that they are intrusive to pulsewidth modulation (PWM). An additional switching sequence has to be embedded in the control that will cause a torque and current ripple. In order to overcome these problems, a new flux-estimation algorithm that uses the phase current derivative to extract the flux-position information is presented. In contrast to previously introduced methods, this new approach operates without additional transient excitation of the machine and requires only fundamental-wave excitation using standard PWM or slightly modified PWM. Furthermore, only the current response in the two active states of PWM is used. This makes it possible to use sensorless control for the whole speed range including overmodulation and removes the distortion and parasitic influence of the zero switching states during the estimation of the flux. Experimental results are presented to validate the applicability of the presented approach.

[1]  R. Krishnan,et al.  Sensorless control of single switch based switched reluctance motor drive using neural network , 2004, 30th Annual Conference of IEEE Industrial Electronics Society, 2004. IECON 2004.

[2]  Th.M. Wolbank,et al.  Combination of signal injection and neural networks for sensorless control of inverter fed induction machines , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[3]  T.M. Wolbank,et al.  Speed sensorless flux and position control of induction machines based on pulse injection and multiple saliency extraction , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[4]  Jiri Matas,et al.  Tracking by an Optimal Sequence of Linear Predictors , 2009, IEEE Transactions on Pattern Analysis and Machine Intelligence.

[5]  Jung-Ik Ha,et al.  Physical understanding of high frequency injection method to sensorless drives of an induction machine , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[6]  Th. M. Wolbank,et al.  A modified PWM scheme in order to obtain spatial information of AC machines without mechanical sensor , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[7]  M. Schroedl,et al.  Sensorless control of AC machines at low speed and standstill based on the "INFORM" method , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[8]  Fernando Briz,et al.  Transient operation of carrier signal injection based sensorless techniques , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).

[9]  Jon Clare,et al.  Sensorless vector control at low and zero frequency considering zero-sequence current in delta connected cage induction motors , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).

[10]  M. Sumner,et al.  Rotor position estimation for induction machines at zero and low frequency utilising zero sequence currents , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[11]  Mohamed S. Zaky,et al.  Wide-Speed-Range Estimation With Online Parameter Identification Schemes of Sensorless Induction Motor Drives , 2009, IEEE Transactions on Industrial Electronics.

[12]  Thomas M. Wolbank,et al.  Closed-loop compensating sensors versus new current derivative sensors for shaft-sensorless control of inverter fed induction machines , 2004, IEEE Transactions on Instrumentation and Measurement.

[13]  Qiang Gao,et al.  Position Estimation of AC Machines Over a Wide Frequency Range Based on Space Vector PWM Excitation , 2007, IEEE Transactions on Industry Applications.

[14]  J. Holtz,et al.  Acquisition of Position Error and Magnet Polarity for Sensorless Control of PM Synchronous Machines , 2008, IEEE Transactions on Industry Applications.

[15]  Qiang Gao,et al.  Sensorless Position and Speed Control of Induction Motors Using High-Frequency Injection and Without Offline Precommissioning , 2007, IEEE Transactions on Industrial Electronics.

[16]  Hamid A. Toliyat,et al.  Neural-Network-Based Parameter Estimations of Induction Motors , 2008, IEEE Transactions on Industrial Electronics.

[17]  Ralph Kennel,et al.  Predictive control in power electronics and drives , 2008, 2008 IEEE International Symposium on Industrial Electronics.

[18]  Ronald G. Harley,et al.  Recurrent Neural Networks Trained With Backpropagation Through Time Algorithm to Estimate Nonlinear Load Harmonic Currents , 2008, IEEE Transactions on Industrial Electronics.

[19]  Seung-Ki Sul,et al.  Comparison of PM Motor Structures and Sensorless Control Techniques for Zero-Speed Rotor Position Detection , 2006, IEEE Transactions on Power Electronics.

[20]  Roberto Cárdenas,et al.  Sensorless Control of Doubly-Fed Induction Generators Using a Rotor-Current-Based MRAS Observer , 2008, IEEE Transactions on Industrial Electronics.

[21]  Seung-Ki Sul,et al.  Advantages of Inset PM Machines for Zero-Speed Sensorless Position Detection , 2008, IEEE Transactions on Industry Applications.

[22]  Mark Sumner,et al.  Hybrid rotor position observer for wide speed-range sensorless PM motor drives including zero speed , 2006, IEEE Transactions on Industrial Electronics.

[23]  C. Caruana,et al.  Sensorless flux position estimation at low and zero frequency by measuring zero-sequence current in delta connected cage induction machines , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[24]  A. Testa,et al.  Sensorless Rotor Position Estimation in Synchronous Reluctance Motors Exploiting a Flux Deviation Approach , 2007, IEEE Transactions on Industry Applications.