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ABSTRACT: The paper proposes a direct torque control (DTC) algorithm suitable for low-variable-frequency operation of the brushless doubly fed reluctance machine (BDFRM) and considers aspects of its practical implementation. The simulation and experimental results show that a small BDFRM prototype can successfully operate down to zero supply frequency of the inverter-fed (secondary) winding, unlike cage induction or many other alternating current machines with DTC. This BDFRM advantage is a consequence of using a flux estimation technique not relying on the secondary voltage integration and therefore avoiding the well-known problems at low secondary frequencies, being typical for the BDFRM normal operation. The developed algorithm also offers the prospect for optimizing the machine performance in a manner similar to conventional vector controllers but with control actions executed in a stationary reference frame as usual for all traditional DTC methods. The maximum torque per inverter ampere control strategy has been chosen as a case study.
IEEE Transactions on Industry Applications 06/2006; · 1.66 Impact Factor
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ABSTRACT: The paper proposes a direct torque control (DTC) algorithm suitable for low variable frequency operation of the BDFRM and considers aspects of its practical implementation. The simulation and experimental results generated for a small prototype will show that the machine can successfully operate down to zero supply frequency of the inverter-fed (secondary) winding, unlike cage induction or many other traditional AC machines with DTC. This undoubt advantage of the BDFRM is a consequence of using a flux estimation technique not relying on the secondary voltage integration and therefore avoiding the well-known problems at low secondary frequencies, typical for the BDFRM normal operation. The developed algorithm also offers the prospect of the machine performance being optimised in a manner similar to conventional vector controllers but with control actions executed in a stationary reference frame as usual for all the DTC methods. The maximum torque per inverter ampere (MTPIA) control strategy has been selected as a case study.
Industry Applications Conference, 2004. 39th IAS Annual Meeting. Conference Record of the 2004 IEEE; 11/2004
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ABSTRACT: The brushless doubly-fed reluctance machine (BDFRM) is a potential low cost alternative to the existing solutions in applications with limited variable speed ranges. The cost effectiveness of the BDFRM drive can be attributed to the possibility of using a partially rated power electronic converter. This paper proposes a new sensorless direct torque (and flux) control (DTC) algorithm for this machine which appears to be superior In many respects to those used for cage Induction and other AC machines. The scheme developed is also applicable to the doubly-excited wound rotor induction machine. The results shown have demonstrated good controller performance over the desired speed range for different loading conditions.
Electric Machines and Drives Conference, 2003. IEMDC'03. IEEE International; 07/2003
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ABSTRACT: This paper considers various aspects of field oriented control, direct torque control and scalar control of an ideal brushless doubly-fed reluctance machine (no saturation and with sinusoidally distributed windings). Modeling fundamentals are introduced first and mathematical expressions of interest to the primary flux oriented control for the machine are subsequently derived from the model equations. A vector control algorithm based on these expressions is then briefly discussed.
Power Electronics, Machines and Drives, 2002. International Conference on (Conf. Publ. No. 487); 07/2002
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ABSTRACT: A comprehensive comparative study of various vector control strategies for the brushless doubly fed reluctance machine (BDFRM) is presented in this paper. Open and closed-loop scalar control algorithms for the machine are developed and examined by computer simulations. Particular emphasis is placed on the machine performance/inverter size trade-offs associated with the control properties considered. Most of this analysis is carried out using normalised modelling techniques specifically focusing on the BDFRM target applications-large pump-type drives and variable speed constant frequency wind-turbine generators.
Power Electronics and Drive Systems, 2001. Proceedings., 2001 4th IEEE International Conference on; 11/2001
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ABSTRACT: The paper proposes a direct torque control (DTC) algorithm for the BDFRM and outlines the configuration of a laboratory test facility at Northumbria University for its practical implementation. The simulation and experimental results generated for a small prototype will show that the machine can successfully operate down to zero supply frequency of the inverter-fed (secondary) winding, unlike cage induction or many other traditional AC machines with DTC. This performance advantage of the BDFRM is a consequence of an improved DTC scheme based on a flux estimation technique which doesn't rely on the secondary voltage integration and therefore avoids related problems at low secondary frequencies, typical for the BDFRM operation. The developed algorithm also allows the machine performance parameters to be optimised in a manner similar to conventional vector controllers but with control actions executed in a stationary reference frame as usual for all DTC methods. The maximum torque per inverter ampere (MTPIA) control strategy has been used as a case study.
Power Electronics, Machines and Drives, 2004. (PEMD 2004). Second International Conference on (Conf. Publ. No. 498);
