EPE Association: NORpie 2000 - Topic 03: PM CONTROL

NORpie 2000 - Topic 03: PM CONTROL
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2000 > NORpie 2000 - Topic 03: PM CONTROL

   [return to parent folder]

   Open Loop Stability and Stabilization of Permanent Magnet Synchronous Motor Drives Using DC-Link Current
By P .D. Chandana Perera; Frede Blaabjerg; John K. Pedersen; Paul Thogersen [View]
[Download]

Abstract: When Permanent Magnet Synchronous Motors (PMSMs) - with sinusoidal back EMF - are used for applications like pumps and fans simple open loop speed control techniques may sufficient to achieve required control performance. The inherent problem with open lop PMSM drives is instability after exceeding a certain supply frequency. In this paper the open loop stability characteristics of PMSM drives are described in detail. Using a simplified small signal dynamics model of the PMSM it is shown how the system can be stabilized for a wide frequency range, by modulating the supply frequency proportionally to DC-link current perturbations. Implementation of this stabilizer loop in a PMSM drive scheme is described and the experimental results are presented.

   A Current Source PWM-Converter fed Permanent Magnet Synchronous Motor drive with Adjustable DC-link Current
By K. Kuusela; M. salo; H. Tuusa [View]
[Download]

Abstract: This paper presents the results of a project to further develop the Current Source PWM-Converter (CSC) technique. The object of this paper is to investigate the characteristic features of CSC with variable dc-link current in permanent magnet synchronous machine (PMSM) application. The function of the proposed concept is examined with a prototype that includes two independently controlled PWM-bridges. The magnitude of the dc-link current is controlled depending on the load conditions to improve the overall efficiency of the converter.

   PM Generator with Series Compensated Diode Rectifier
By Anders Grauers; Anders Lindskog [View]
[Download]

Abstract: This paper presents an investigation of a series compensated diode rectifier for permanent magnet generators. Series compensation has the advantage that the reactive power produced by the compensation follows the variations in the generator’s reactive power consumption, as the generator currents change. The investigation show good performance at speeds close to rated speed, and show problems of generating high power at low speed. The investigation also shows that series compensation works well in the whole operating range of a wind turbine generator system. However, the behaviour under abnormal operating conditions remains to be studied.

NORpie 2000 - Topic 03: PM CONTROL
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2000 > NORpie 2000 - Topic 03: PM CONTROL
	[return to parent folder]

	Open Loop Stability and Stabilization of Permanent Magnet Synchronous Motor Drives Using DC-Link Current By P .D. Chandana Perera; Frede Blaabjerg; John K. Pedersen; Paul Thogersen	[View] [Download]
Abstract: When Permanent Magnet Synchronous Motors (PMSMs) - with sinusoidal back EMF - are used for applications like pumps and fans simple open loop speed control techniques may sufficient to achieve required control performance. The inherent problem with open lop PMSM drives is instability after exceeding a certain supply frequency. In this paper the open loop stability characteristics of PMSM drives are described in detail. Using a simplified small signal dynamics model of the PMSM it is shown how the system can be stabilized for a wide frequency range, by modulating the supply frequency proportionally to DC-link current perturbations. Implementation of this stabilizer loop in a PMSM drive scheme is described and the experimental results are presented.

	A Current Source PWM-Converter fed Permanent Magnet Synchronous Motor drive with Adjustable DC-link Current By K. Kuusela; M. salo; H. Tuusa	[View] [Download]
Abstract: This paper presents the results of a project to further develop the Current Source PWM-Converter (CSC) technique. The object of this paper is to investigate the characteristic features of CSC with variable dc-link current in permanent magnet synchronous machine (PMSM) application. The function of the proposed concept is examined with a prototype that includes two independently controlled PWM-bridges. The magnitude of the dc-link current is controlled depending on the load conditions to improve the overall efficiency of the converter.

	PM Generator with Series Compensated Diode Rectifier By Anders Grauers; Anders Lindskog	[View] [Download]
Abstract: This paper presents an investigation of a series compensated diode rectifier for permanent magnet generators. Series compensation has the advantage that the reactive power produced by the compensation follows the variations in the generator’s reactive power consumption, as the generator currents change. The investigation show good performance at speeds close to rated speed, and show problems of generating high power at low speed. The investigation also shows that series compensation works well in the whole operating range of a wind turbine generator system. However, the behaviour under abnormal operating conditions remains to be studied.