NDLI: Voltage-Hertz Control of the Synchronous Machine with Variable Excitation

Content Provider	IEEE Xplore Digital Library
Author	Szabo, Cs. Incze, I.I. Imecs, M.
Copyright Year	2006
Description	Author affiliation: Cluj-Napoca Tech. Univ. (Szabo, Cs.; Incze, I.I.; Imecs, M.)
Abstract	In spite of the development of the vector control methods for the AC machines, the scalar control also finds his place in various industrial applications. Generally, the scalar control is used in reduced speed-range applications where is no need for exceptional dynamic behaviour. In order to achieve the highest torque per ampere ratio, the flux amplitude has to be maintained at his rated value. This can be achieved by adjusting in a proper way the $U_{S}$ amplitude and the $f_{S}$ frequency of the stator-voltage. The working frequency is determined by the parameters of the application, so the constant flux operation can be maintained by adjusting the supply voltage amplitude. The first control method, which assures loss-less operation for the motor is the so-called constant voltage-Hertz operation. The only control variable is the stator-voltage frequency, while the voltage is computed based on the simplified steady-state equivalent circuit of the stator. Nevertheless, the main drawback of the constant volt/Hertz procedure consists on the effects of the voltage which can cause problems at low speed operation. These voltage drops at low frequencies has the same order of magnitude with the computed voltage, which makes the method inadequate at low speed. This can be eliminated by adopting different techniques, for the voltage drop compensation. The paper deals with current-feedback-based voltage-drop computation procedures for a salient-pole synchronous motor, with variable excitation. In addition to the known current-feedback compensation method, in this case also the excitation voltage is controlled, is order to improve the dynamic behaviour of the system
Sponsorship	IEEE Comput. Soc. - Test Technol. Tech. Council Tech. Uni. of Cluj-Napoca IPA - R&D Inst. for Autom., Center for Tech. Transfer Cluj Uni. of Girona Romanian Minist. of Educ. and Res. Romanian Acad. for Tech. Sci. SRAIT- Romanian Soc. of Autom. and Tech. Informatics
Starting Page	298
Ending Page	303
File Size	375246
Page Count	6
File Format	PDF
ISBN	142440360X
DOI	10.1109/AQTR.2006.254546
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-05-25
Publisher Place	Romania
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Torque Industrial control AC machines Stators Frequency Synchronous motors Dynamic voltage scaling Voltage control Synchronous machines Machine vector control
Content Type	Text
Resource Type	Article

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