EPE Association: EPE 1995 - 02 - Lecture Session L1b: MODULATION TECHNIQUES

EPE 1995 - 02 - Lecture Session L1b: MODULATION TECHNIQUES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 02 - Lecture Session L1b: MODULATION TECHNIQUES

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   FEATURES OF ADAPTIVE PWM EXPLORED BY THE THEORY OF CHAOS
By I. Nagy; Z. Süto; L. Matakas Jr; E. Masada [View]
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Abstract: The paper is concerned with an induction motor driver supplied by a voltage source inverter and controlled by a tolerance band adaptive current controller. It is shown that by changing the system parameters, chaotic and periodic states, as well as transition states between them, are developed in a chaotic distribution. By modifYing one of the system parameters as a control parameter, the state of the drive can be converted from chaotic or transition state into one of the infinitely large number of periodic states.

   OPTIMIZED AND NON-OPTIMIZED RANDOM MODULATION TECHNIQUES FOR VSI DRIVES
By F. Blaabjerg; J .K. Pedersen; L. Oestergaardt; R.L. Kirlin; A.M. Trzynadlowski; S. Legowski [View]
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Abstract: Random pulse width modulation techniques are known to reduce acoustical noise and vibration in inverter fed ac drive systems. The randomization can easily be done by varying widths of individual switching intervals. A random modulation strategy can be optimized with respect to a given objective. Four such strategies are described and compared. Harmonic torques in an induction motor, switching losses in the inverter, and the harmonic power in the spectrum of the inverter output voltage are targeted for optimization. Results of experimental investigation are presented for four random strategies and compared with fixed switching frequency operation. The test results show the random strategies flattern out the power spectra and acoustical spectra as well as vibrational test show a reduction in vibration using random modulated strategies.

EPE 1995 - 02 - Lecture Session L1b: MODULATION TECHNIQUES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 02 - Lecture Session L1b: MODULATION TECHNIQUES
	[return to parent folder]

	FEATURES OF ADAPTIVE PWM EXPLORED BY THE THEORY OF CHAOS By I. Nagy; Z. Süto; L. Matakas Jr; E. Masada	[View] [Download]
Abstract: The paper is concerned with an induction motor driver supplied by a voltage source inverter and controlled by a tolerance band adaptive current controller. It is shown that by changing the system parameters, chaotic and periodic states, as well as transition states between them, are developed in a chaotic distribution. By modifYing one of the system parameters as a control parameter, the state of the drive can be converted from chaotic or transition state into one of the infinitely large number of periodic states.

	OPTIMIZED AND NON-OPTIMIZED RANDOM MODULATION TECHNIQUES FOR VSI DRIVES By F. Blaabjerg; J .K. Pedersen; L. Oestergaardt; R.L. Kirlin; A.M. Trzynadlowski; S. Legowski	[View] [Download]
Abstract: Random pulse width modulation techniques are known to reduce acoustical noise and vibration in inverter fed ac drive systems. The randomization can easily be done by varying widths of individual switching intervals. A random modulation strategy can be optimized with respect to a given objective. Four such strategies are described and compared. Harmonic torques in an induction motor, switching losses in the inverter, and the harmonic power in the spectrum of the inverter output voltage are targeted for optimization. Results of experimental investigation are presented for four random strategies and compared with fixed switching frequency operation. The test results show the random strategies flattern out the power spectra and acoustical spectra as well as vibrational test show a reduction in vibration using random modulated strategies.