EPE Association: EPE-PEMC 2000 - Topic 04b: Electromagnetic Interference

EPE-PEMC 2000 - Topic 04b: Electromagnetic Interference
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 04: Electromagnetic Compatibility > EPE-PEMC 2000 - Topic 04b: Electromagnetic Interference

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   Design and Implementation of a Novel Digital Power Factor Controller for APWM AC Chopper
By Krim F. [View]
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Abstract: This paper deals with a new asymmetrical pulse width modulated (APWM) technique for single and three phase AC choppers which can control input power factor as well as improves the output waveforms quality . The PWM switching patterns at the specified phase angle are obtained by a new recursive least error squares identification algorithm and implemented by a microcontroller. Theoretical comparisons are made with conventional PWM technique and the computed performances indicate the superiority of the proposed technique. Several characteristics are investigated theoretically by digital simulation and then compared with those of the conventional PWM one. Practically experimental results, obtained from a constructed and tested microcontroller - based control system, have good agreement with the calculated ones, which proves the feasibility of proposed technique.

   Minimization of Current Harmonics of DTC Controller Using a Suitable Switching Pattern
By Faiz J., Sharifian M.B.B.*, Fedák V.** [View]
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Abstract: In this paper direct torque control (DTC) technique is used for induction motor control. Because of high switching frequency, non-pulsed width modulation (NPWM) techniques are frequently preferred. Four different switching algorithms using hysteresis and non-hysteresis controllers are proposed and compared. The harmonic spectra of the stator voltage, current and torque are determined and compared in the above techniques. The results indicate that the non-hysteresis controllers have lower initial expense and current cost (consumed power, and current and torque ripples) compared with the hysteresis controllers. Among these algorithms, the non-hysteresis controllers called two-band flux controller and triple-band torque controller lead to a better result with an advantage of simpler control algorithms.

   Perspectives of Employment of Mains Hybrid RFI-Protective Filters
By Kurovsky T.*, Pilinsky V., Rodionova M., Slobodian L., Shvaichenko V. [View]
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Abstract: To decrease high frequency interferences and EMC demands accomplish RFI-filters are used. In the paper it's shown, that employment of traditional passive filters based on reactive components in frequency range from tens Hz to hundreds MHz is non-rational. Expansion of frequency range to low frequencies results in new filters creation. Solution of the problem may consists in hybride active-passive filters. In the paper principal features of RFI-filters are discussed, taking into account different (symmetrical, unsymmetrical, common-mode) ways of conductive interferences propagation and Mains performance. Active filters for AC current are suggested. Results of simulation and experiments confirm prospects of hybrid RFI-filters elaboration.

   Three-Phase Line-Interactive UPS Systems with Series-Parallel Active Power-Line Conditioning for High Power Quality
By Sérgio A., da Silva S.A.O., Donoso-Garcia P.F., Cortizo P.C., Seixas P.F. [View]
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Abstract: This paper presents two three-phase line-interactive UPS systems with active series-parallel power-line conditioning capability. Synchronous Reference Frame (SRF) based controllers, are used to compensate harmonic currents generated from any configuration of non-linear loads. The performance of the UPS systems is evaluated in three-phase, three-wire and four-wire systems, which allow an effective power factor correction, load harmonic current suppression, output voltage regulation and harmonic suppression of the input voltages, for balanced and unbalanced non-linear loads. Simulation results to verify the good performance of the proposed line-interactive UPS systems are shown.

EPE-PEMC 2000 - Topic 04b: Electromagnetic Interference
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 04: Electromagnetic Compatibility > EPE-PEMC 2000 - Topic 04b: Electromagnetic Interference
	[return to parent folder]

	Design and Implementation of a Novel Digital Power Factor Controller for APWM AC Chopper By Krim F.	[View] [Download]
Abstract: This paper deals with a new asymmetrical pulse width modulated (APWM) technique for single and three phase AC choppers which can control input power factor as well as improves the output waveforms quality . The PWM switching patterns at the specified phase angle are obtained by a new recursive least error squares identification algorithm and implemented by a microcontroller. Theoretical comparisons are made with conventional PWM technique and the computed performances indicate the superiority of the proposed technique. Several characteristics are investigated theoretically by digital simulation and then compared with those of the conventional PWM one. Practically experimental results, obtained from a constructed and tested microcontroller - based control system, have good agreement with the calculated ones, which proves the feasibility of proposed technique.

	Minimization of Current Harmonics of DTC Controller Using a Suitable Switching Pattern By Faiz J., Sharifian M.B.B., Fedák V.*	[View] [Download]
Abstract: In this paper direct torque control (DTC) technique is used for induction motor control. Because of high switching frequency, non-pulsed width modulation (NPWM) techniques are frequently preferred. Four different switching algorithms using hysteresis and non-hysteresis controllers are proposed and compared. The harmonic spectra of the stator voltage, current and torque are determined and compared in the above techniques. The results indicate that the non-hysteresis controllers have lower initial expense and current cost (consumed power, and current and torque ripples) compared with the hysteresis controllers. Among these algorithms, the non-hysteresis controllers called two-band flux controller and triple-band torque controller lead to a better result with an advantage of simpler control algorithms.

	Perspectives of Employment of Mains Hybrid RFI-Protective Filters By Kurovsky T., Pilinsky V., Rodionova M., Slobodian L., Shvaichenko V.*	[View] [Download]
Abstract: To decrease high frequency interferences and EMC demands accomplish RFI-filters are used. In the paper it's shown, that employment of traditional passive filters based on reactive components in frequency range from tens Hz to hundreds MHz is non-rational. Expansion of frequency range to low frequencies results in new filters creation. Solution of the problem may consists in hybride active-passive filters. In the paper principal features of RFI-filters are discussed, taking into account different (symmetrical, unsymmetrical, common-mode) ways of conductive interferences propagation and Mains performance. Active filters for AC current are suggested. Results of simulation and experiments confirm prospects of hybrid RFI-filters elaboration.

	Three-Phase Line-Interactive UPS Systems with Series-Parallel Active Power-Line Conditioning for High Power Quality By Sérgio A., da Silva S.A.O., Donoso-Garcia P.F., Cortizo P.C., Seixas P.F.	[View] [Download]
Abstract: This paper presents two three-phase line-interactive UPS systems with active series-parallel power-line conditioning capability. Synchronous Reference Frame (SRF) based controllers, are used to compensate harmonic currents generated from any configuration of non-linear loads. The performance of the UPS systems is evaluated in three-phase, three-wire and four-wire systems, which allow an effective power factor correction, load harmonic current suppression, output voltage regulation and harmonic suppression of the input voltages, for balanced and unbalanced non-linear loads. Simulation results to verify the good performance of the proposed line-interactive UPS systems are shown.