EPE Association: EPE 2005 - Topic 16-2b - DS: Electromagnetic Compatibility

EPE 2005 - Topic 16-2b - DS: Electromagnetic Compatibility
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 16: OPERATING QUALITY OF SYSTEMS > EPE 2005 - Topic 16-2b - DS: Electromagnetic Compatibility

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   Frequency Modulation Techniques for EMI Reduction in SMPS
By FERRER Lluis; GAGO Javier; LAMICH Manel; GONZALEZ David; BALCELLS Josep [View]
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Abstract: Frequency modulation (FM) techniques have been used to reduce EMI of synchronous digital systems working in the range of hundreds of MHz. The working principle consists of modulating the clock frequency in order to spread the energy of each single harmonic into a certain frequency band, thus reducing the peak amplitude of EMI at the harmonics frequencies. Nowadays the switching frequency of power converters has increased up to values which allow the application of frequency modulation to reduce EMI. The paper summarizes some theoretical principles of FM techniques applied to the switching frequency and shows the effectiveness, in terms of EMI reduction. Experimental tests are presented for validation, evaluating also the possible side effects on the converter efficiency and supply harmonics.

   Hidden reflection phenomena on inverter-fed induction motors
By BELMANS Ronnie; CATRYSSE Johan; PEUTEMAN Joan; KNOCKAERT Jos [View]
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Abstract: When supplying an induction motor by a PWM-inverter through long cables, reflections occur. For some inverters other reflection phenomena than the usual overvoltages appear at the motor side, namely steps smaller than 0.5 p.u. of the , also called stair stepping. The stair stepping reflection phenomenon occurs at the commutation from IGBT to diode. Stair stepping depends on the magnitude of the current, the cable impedance and on the dead time of the IGBT gate-signal. The reflection phenomenon increases the turn on time of the diode.

   High Frequency model of a shielded 4-wire energy cable
By WEENS Yannick; FRANCHAUD Jean Jacques; IDIR Nadir; BAUSIERE Robert [View]
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Abstract: In Adjustable Speed Drive (ASD) applications, most cables connecting the electronic voltage source to the ac-motor are multi-wire and shielded. The various inductive and capacitive effects are at the origin of high frequency phenomena that require models with distributed parameters as in transmission lines. From curves showing the evolution of the cable impedance with frequency, and under the assumption of choosing appropriate models, it is possible to calculate the values of the numerous parameters of the model from design tool software. This paper deals with the modelling of a shielded 4-wire energy cable, with the determination of the values of the parameters R, L, C and G of the energy cable, in order to obtain an equivalent electric model which is valid both in the time and frequency domains. The obtained results show that the proposed model reproduces the oscillations of current induced by the hard switchings of the power converter with a weak difference when compared to experimental measurements.

   Resonance phenomena and propagation of frequency converter harmonics in the catenary of railways with single-phase A.C.
By ZYNOVCHENKO Andriy; KLIER Franz; JANK Steffen; XIE Jian [View]
[Download]

Abstract: Frequency converters find wide application in rail vehicles and power supply stations of railway networks. An important disadvantage of frequency converters is the emission of voltage and current harmonics. They cause extra stress of railway equipments and can affect sensitive signal circuits. Propagation of frequency converter harmonics in the catenary and resonance phenomena are studied in this paper.

EPE 2005 - Topic 16-2b - DS: Electromagnetic Compatibility
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 16: OPERATING QUALITY OF SYSTEMS > EPE 2005 - Topic 16-2b - DS: Electromagnetic Compatibility
	[return to parent folder]

	Frequency Modulation Techniques for EMI Reduction in SMPS By FERRER Lluis; GAGO Javier; LAMICH Manel; GONZALEZ David; BALCELLS Josep	[View] [Download]
Abstract: Frequency modulation (FM) techniques have been used to reduce EMI of synchronous digital systems working in the range of hundreds of MHz. The working principle consists of modulating the clock frequency in order to spread the energy of each single harmonic into a certain frequency band, thus reducing the peak amplitude of EMI at the harmonics frequencies. Nowadays the switching frequency of power converters has increased up to values which allow the application of frequency modulation to reduce EMI. The paper summarizes some theoretical principles of FM techniques applied to the switching frequency and shows the effectiveness, in terms of EMI reduction. Experimental tests are presented for validation, evaluating also the possible side effects on the converter efficiency and supply harmonics.

	Hidden reflection phenomena on inverter-fed induction motors By BELMANS Ronnie; CATRYSSE Johan; PEUTEMAN Joan; KNOCKAERT Jos	[View] [Download]
Abstract: When supplying an induction motor by a PWM-inverter through long cables, reflections occur. For some inverters other reflection phenomena than the usual overvoltages appear at the motor side, namely steps smaller than 0.5 p.u. of the , also called stair stepping. The stair stepping reflection phenomenon occurs at the commutation from IGBT to diode. Stair stepping depends on the magnitude of the current, the cable impedance and on the dead time of the IGBT gate-signal. The reflection phenomenon increases the turn on time of the diode.

	High Frequency model of a shielded 4-wire energy cable By WEENS Yannick; FRANCHAUD Jean Jacques; IDIR Nadir; BAUSIERE Robert	[View] [Download]
Abstract: In Adjustable Speed Drive (ASD) applications, most cables connecting the electronic voltage source to the ac-motor are multi-wire and shielded. The various inductive and capacitive effects are at the origin of high frequency phenomena that require models with distributed parameters as in transmission lines. From curves showing the evolution of the cable impedance with frequency, and under the assumption of choosing appropriate models, it is possible to calculate the values of the numerous parameters of the model from design tool software. This paper deals with the modelling of a shielded 4-wire energy cable, with the determination of the values of the parameters R, L, C and G of the energy cable, in order to obtain an equivalent electric model which is valid both in the time and frequency domains. The obtained results show that the proposed model reproduces the oscillations of current induced by the hard switchings of the power converter with a weak difference when compared to experimental measurements.

	Resonance phenomena and propagation of frequency converter harmonics in the catenary of railways with single-phase A.C. By ZYNOVCHENKO Andriy; KLIER Franz; JANK Steffen; XIE Jian	[View] [Download]
Abstract: Frequency converters find wide application in rail vehicles and power supply stations of railway networks. An important disadvantage of frequency converters is the emission of voltage and current harmonics. They cause extra stress of railway equipments and can affect sensitive signal circuits. Propagation of frequency converter harmonics in the catenary and resonance phenomena are studied in this paper.