MRAS Based Sensorless Control of a Series-Connected Five-Phase Two-Motor Drive System

Multi-phase machines can be used in variable speed drives. Their applications include electric ship propulsion, 'more-electric aircraft' and traction applications, electric vehicles, and hybrid electric vehicles. Multi-phase machines enable independent control of a few numbers of machines that are connected in series in a particular manner with their supply being fed from a single voltage source inverter (VSI). The idea was first implemented for a five-phase series-connected two-motor drive system, but is now applicable to any number of phases more than or equal to five-phase. The number of series-connected machines is a function of the phase number of VSI. Theoretical and simulation studies have already been reported for number of multi-phase multi-motor drive configurations of series-connection type. Variable speed induction motor drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. To replace the sensor, information concerning the rotor speed is extracted from measured stator currents and voltages at motor terminals. Open-loop estimators or closed-loop observers are used for this purpose. They differ with respect to accuracy, robustness, and sensitivity against model parameter variations. This paper analyses operation of an MRAS estimator based sensorless control of a vector controlled series-connected two-motor five￢phase drive system with current control in the stationary reference frame. Results, obtained with fixed￢voltage, fixed-frequency supply, and hysteresis current control are presented for various operating conditions on the basis of simulation results. The purpose of this paper is to report the first ever simulation results on a sensorless control of a five-phase two-motor series-connected drive system. The operating principle is given followed by a description of the sensorless technique.

[1]  Martin Jones,et al.  Even-phase multi-motor vector controlled drive with single inverter supply and series connection of stator windings , 2003 .

[2]  S. Williamson,et al.  Pulsating torque and losses in multiphase induction machines , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[3]  Kwon Soon Lee,et al.  Internet Traffic Control Using Dynamic Neural Networks , 2008 .

[4]  Martin Jones,et al.  Vector control schemes for series-connected six-phase two-motor drive systems , 2005 .

[5]  H.A. Toliyat,et al.  Operating principles of a novel multiphase multimotor vector-controlled drive , 2004, IEEE Transactions on Energy Conversion.

[6]  S. Gataric.  A polyphase cartesian vector approach to control of polyphase AC machines , 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).

[7]  Atif Iqbal,et al.  Vector Control of a Five-Phase Series-Connected Two-Motor Drive Using Synchronous Current Controllers , 2005 .

[8]  H.A. Toliyat,et al.  A novel concept of a multiphase, multimotor vector controlled drive system supplied from a single voltage source inverter , 2004, IEEE Transactions on Power Electronics.

[9]  M. Jones,et al.  A six-phase series-connected two-motor drive with decoupled dynamic control , 2005, IEEE Transactions on Industry Applications.

[10]  Joachim Holtz,et al.  Sensorless Control of Induction Machines - With or Without Signal Injection? , 2006, IEEE Trans. Ind. Electron..

[11]  Barrie Mecrow,et al.  Sensorless operation of a fault tolerant PM drive , 2003 .

[12]  Peter Vas,et al.  Sensorless vector and direct torque control , 1998 .

[13]  K. Gopakumar,et al.  Independent Speed Control of Two Six-Phase Induction Motors Using a Single Six-Phase Inverter , 2004 .

[14]  Atif Iqbal,et al.  RNN-Based Sensorless Control of A Five-Phase Induction Motor Drive , 2007 .

[15]  H.A. Toliyat,et al.  Induction Machine/Syn-Rel Two-Motor Five-Phase Series-Connected Drive , 2007, IEEE Transactions on Energy Conversion.

[16]  Hamid A. Toliyat,et al.  Modeling and control of a five-phase series-connected two-motor drive , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).

[17]  Hamid A. Toliyat,et al.  Modeling, Control, and Experimental Investigation of a Five-Phase Series-Connected Two-Motor Drive With Single Inverter Supply , 2007, IEEE Transactions on Industrial Electronics.

[18]  Martin Jones,et al.  A Five-Phase Two-Machine Vector Controlled Induction Moto Drive Supplied from a Single Inverter , 2004 .

[19]  Kais Atallah,et al.  Optimal torque control of fault-tolerant permanent magnet brushless machines , 2003 .

[20]  Yong-Wan Park,et al.  Approximate ML Detection with the Best Channel Matrix Selection for MIMO Systems , 2008 .