EPE Association: EPE 1995 - 32 - Dialogue Session DS2d: Active Filters

EPE 1995 - 32 - Dialogue Session DS2d: Active Filters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 32 - Dialogue Session DS2d: Active Filters

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   ACTIVE SYMMETRICAL LATTICE FILTER FOR HARMONIC CURRENT REDUCTION
By Z. D. Koozehkanani; P. Mehta; M. K. Darwish [View]
[Download]

Abstract: In recent years there has been increasing concern over the introduction of current harmonics in power supply systems due to the use of non-linear loads such as thyristor converters. This has resulted in considerable interest in the development of active filters suitable for eliminating a range of current harmonics. This paper presents the development of active filters which are derived from the conventional symmetrical lattice circuits. To assess the effectiveness of this approach the filter is used to reduce current harmonics in a rectifier circuit feeding a capacitive load.

   A THREE-PHASE FOUR-WIRE SHUNT ACTIVE FILTER USING SIX IGBT'S
By M. Aredes; J. Haefner; K. Heumann [View]
[Download]

Abstract: A 3-phase 4-wire shunt active power filter using a conventional 3-leg converter, without need of power supply at dc bus, is presented. The active filter controller considers harmonics, reactive currents, as well as unbalance due to negative and zero sequence components at fundamental frequency. The goal is to provide balanced sinusoidal currents to the source, even under unbalanced voltage conditions. Some simulation and experimental results are presented to validate the control strategy.

   VECTOR CONTROL OF SHUNT ACTIVE FILTERS
By H. Pouliquen; P. Rioual [View]
[Download]

Abstract: The benefits of using vector control, applied to the field of harmonics frequencies, for high~power active filters operating at low sampling frequencY,are demonstrated. The active filter is modelled in the reference frame D, Q rotating at the frequencies 50 Hz (Park frame), 250 Hz and 350 Hz. In these frames, the harmonics which appear as DC values are easier to control.

   SECTION HYBRID FILTER FOR CURRENT HARMONICS IN A TEST STAND TO REGENERATIVE BRAKING OF INTERNAL COMBUSTION LOCOMOTIVES
By R. Strzelecki; L. Frackowiak; J. Zyborski; G. Benysek [View]
[Download]

Abstract: The paper presents results of simulation research on different systems to compensation of reactive power and line current harmonics of a thyristor stand to regenerative braking of internal combustion engine locomotives. The research was carried on a passive filter and also on 1, 2 and 3 sections hybrid filter. There were determined the main parameters and characteristics of the filters. It has been shown that the section hybrid filter is advantageous for high power thyristor stands.

   WIDE-BAND FILTER WITH ACTIVELY REDUCED LOSSES FOR POWER-SYSTEMS
By G. Vaupel [View]
[Download]

Abstract: In HV-AC applications passive filters are used to reduce line interferences. Wide-band characteristic can be achieved via resistors with the penalty of high power dissipation. This paper shows that apart from economical advantages the usage of active elements in combination with a passive filter offers loss reduction by more than 90 %, correction of parameter variations and active damping of parallel resonances between capacitance and inductances of the passive filter and the line. Digital simulations verify the performance of the suggested active filter extension for double tuned wide-band filters.

   LINE FILTER FOR HIGH POWER INVERTER LOCOMOTIVE USING ACTIVE CIRCUIT FOR HARMONIC REDUCTION. PROTOTYPE TESTS RESULTS
By M. Carpita; G. Giannini; E. Gilardi; P. Leonardelli [View]
[Download]

Abstract: In order to reduce the harmonic contents of the currents injected by the power converter in the overhead traction line, a passive input filter is actually used in high power and high performance 3KV locomotives.The aim of this paper is to explain how it is possible to maintain the harmonic components of current below the limits established by the Italian State Railways, at the same time reducing weight and dimension of the locomotive filter. An experimental fulfilment of a combination of an active and a passive filter is shown, together with the relevant control scheme and the experimental results.

   A CONTROL METHOD OF ACTIVE POWER FILTER IN UNSYMMETRICAL VOLTAGE SYSTEM
By Y. Komatsu; T. Kawabata [View]
[Download]

Abstract: The usual instantaneous reactive power q has been defined by using a,B components of the voltage and current. The current from the power source contains higher harmonic components when q is used for the control method of an active power filter in unsymmetrical three-phase three-wire system. The higher harmonic current components are bad for telecommwlication and so on. Therefore. the authors have defined a new instantaneous reactive power whose mean value is equal to the three phase reactive power. By the use of this value. the authors have clarified a new calculation method for compensating current command which solves the defects of the conventional pq method. Lastly, the authors have given the calculation method of compensating current command in the three-phase four-wire system.

   HIGH-POWER VOLTAGE SOURCE PWM ACTIVE FILTER WITH LOW SWITCHING EFFECT
By C. Lott; O. Lapierre; H. Pouliquen [View]
[Download]

Abstract: The aim of this study is to built a GTO three phase voltage source inverter operating as a shunt active filter. It uses PWM control at a switching frequency which is limited by the high power envisaged for the converter. A solution to avoid the switching effects on the mains is described and tested. The active power filter described in the paper can be used as current filter and also as voltage filter. Experimental results are given and discussed.

   NEW CONTROL METHOD FOR ACTIVE POWER FILTER NEEDING LINE CURRENT MEASUREMENT ONLY
By Philippe Delarue; Robert Bausiere [View]
[Download]

Abstract: In this paper a new control technique for a 3-phase active power filter is presented. This control principle is based on line current measurement only, while load currents and active power filter currents are not measured. This method leads to a very simple control circuit and gives good performances in steady state and during transients. A numerical simulation of an active power filter using this new control technique has been carried out and experimental results illustrate excellent operation of the proposed principle .

   AC/AC THREE PHASE CONVERTER OPERATING WITH UNITY POWER FACTOR AND SINUSOIDAL INPUT CURRENT
By W. Koczara; B. Dakyo; L. Protin [View]
[Download]

Abstract: A concept of unity power factor, sinusoidal current ac/ac voltage converter and its control idea is described. A classical ac/ac thyristor converter is equiped in parallel full controlled ac/dc converter. This additional converter operates as an active filter. An actual current rate is limited only by supply line inductance. The active filter actual currents rate depends on the additional inductance on ac side and dc voltage. The paper describes conditions of load and active filter inductance of the active filter and dc voltage which are required to produce sinusoidal current input. Results of simulation and laboratory tests of the modified ac/ac converter which controls continuously output power and input current are presented.

   A NEW APPROACH TO HARMONIC COMPENSATION WITH HYBRID ACTIVE FILTERS
By Angel Antonio Bayod Rujula; Mariano Sanz Badia [View]
[Download]

Abstract: This paper presents a combined system of passive filter and small-rated active filters. A new compensation principle is described, obtaining current in the source and voltage at the pec both sinusoidal, and improvement in the power factor. The ftltering characteristics are discussed theoretically and several situations are simulated.

   AN ACTIVE POWER FILTER AND UNBALANCED CURRENT COMPENSATOR CONTROL CIRCUIT
By P. Verdelho; G. D. Marques [View]
[Download]

Abstract: This paper presents a control circuit for the three phase PWM voltage converter connected to the AC mains when used as an active power filter and unbalanced current compensator. A decoupled system in Park's variables is achieved and so simple controllers with excellent performance can be used. The controllers are implemented directly in the Park's referential. Expressions for the controller's synthesis are derived. Experimental results from a 2 kVA IGBT prototype showing the dynamic and steady state system's performances are presented.

EPE 1995 - 32 - Dialogue Session DS2d: Active Filters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 32 - Dialogue Session DS2d: Active Filters
	[return to parent folder]

	ACTIVE SYMMETRICAL LATTICE FILTER FOR HARMONIC CURRENT REDUCTION By Z. D. Koozehkanani; P. Mehta; M. K. Darwish	[View] [Download]
Abstract: In recent years there has been increasing concern over the introduction of current harmonics in power supply systems due to the use of non-linear loads such as thyristor converters. This has resulted in considerable interest in the development of active filters suitable for eliminating a range of current harmonics. This paper presents the development of active filters which are derived from the conventional symmetrical lattice circuits. To assess the effectiveness of this approach the filter is used to reduce current harmonics in a rectifier circuit feeding a capacitive load.

	A THREE-PHASE FOUR-WIRE SHUNT ACTIVE FILTER USING SIX IGBT'S By M. Aredes; J. Haefner; K. Heumann	[View] [Download]
Abstract: A 3-phase 4-wire shunt active power filter using a conventional 3-leg converter, without need of power supply at dc bus, is presented. The active filter controller considers harmonics, reactive currents, as well as unbalance due to negative and zero sequence components at fundamental frequency. The goal is to provide balanced sinusoidal currents to the source, even under unbalanced voltage conditions. Some simulation and experimental results are presented to validate the control strategy.

	VECTOR CONTROL OF SHUNT ACTIVE FILTERS By H. Pouliquen; P. Rioual	[View] [Download]
Abstract: The benefits of using vector control, applied to the field of harmonics frequencies, for high~power active filters operating at low sampling frequencY,are demonstrated. The active filter is modelled in the reference frame D, Q rotating at the frequencies 50 Hz (Park frame), 250 Hz and 350 Hz. In these frames, the harmonics which appear as DC values are easier to control.

	SECTION HYBRID FILTER FOR CURRENT HARMONICS IN A TEST STAND TO REGENERATIVE BRAKING OF INTERNAL COMBUSTION LOCOMOTIVES By R. Strzelecki; L. Frackowiak; J. Zyborski; G. Benysek	[View] [Download]
Abstract: The paper presents results of simulation research on different systems to compensation of reactive power and line current harmonics of a thyristor stand to regenerative braking of internal combustion engine locomotives. The research was carried on a passive filter and also on 1, 2 and 3 sections hybrid filter. There were determined the main parameters and characteristics of the filters. It has been shown that the section hybrid filter is advantageous for high power thyristor stands.

	WIDE-BAND FILTER WITH ACTIVELY REDUCED LOSSES FOR POWER-SYSTEMS By G. Vaupel	[View] [Download]
Abstract: In HV-AC applications passive filters are used to reduce line interferences. Wide-band characteristic can be achieved via resistors with the penalty of high power dissipation. This paper shows that apart from economical advantages the usage of active elements in combination with a passive filter offers loss reduction by more than 90 %, correction of parameter variations and active damping of parallel resonances between capacitance and inductances of the passive filter and the line. Digital simulations verify the performance of the suggested active filter extension for double tuned wide-band filters.

	LINE FILTER FOR HIGH POWER INVERTER LOCOMOTIVE USING ACTIVE CIRCUIT FOR HARMONIC REDUCTION. PROTOTYPE TESTS RESULTS By M. Carpita; G. Giannini; E. Gilardi; P. Leonardelli	[View] [Download]
Abstract: In order to reduce the harmonic contents of the currents injected by the power converter in the overhead traction line, a passive input filter is actually used in high power and high performance 3KV locomotives.The aim of this paper is to explain how it is possible to maintain the harmonic components of current below the limits established by the Italian State Railways, at the same time reducing weight and dimension of the locomotive filter. An experimental fulfilment of a combination of an active and a passive filter is shown, together with the relevant control scheme and the experimental results.

	A CONTROL METHOD OF ACTIVE POWER FILTER IN UNSYMMETRICAL VOLTAGE SYSTEM By Y. Komatsu; T. Kawabata	[View] [Download]
Abstract: The usual instantaneous reactive power q has been defined by using a,B components of the voltage and current. The current from the power source contains higher harmonic components when q is used for the control method of an active power filter in unsymmetrical three-phase three-wire system. The higher harmonic current components are bad for telecommwlication and so on. Therefore. the authors have defined a new instantaneous reactive power whose mean value is equal to the three phase reactive power. By the use of this value. the authors have clarified a new calculation method for compensating current command which solves the defects of the conventional pq method. Lastly, the authors have given the calculation method of compensating current command in the three-phase four-wire system.

	HIGH-POWER VOLTAGE SOURCE PWM ACTIVE FILTER WITH LOW SWITCHING EFFECT By C. Lott; O. Lapierre; H. Pouliquen	[View] [Download]
Abstract: The aim of this study is to built a GTO three phase voltage source inverter operating as a shunt active filter. It uses PWM control at a switching frequency which is limited by the high power envisaged for the converter. A solution to avoid the switching effects on the mains is described and tested. The active power filter described in the paper can be used as current filter and also as voltage filter. Experimental results are given and discussed.

	NEW CONTROL METHOD FOR ACTIVE POWER FILTER NEEDING LINE CURRENT MEASUREMENT ONLY By Philippe Delarue; Robert Bausiere	[View] [Download]
Abstract: In this paper a new control technique for a 3-phase active power filter is presented. This control principle is based on line current measurement only, while load currents and active power filter currents are not measured. This method leads to a very simple control circuit and gives good performances in steady state and during transients. A numerical simulation of an active power filter using this new control technique has been carried out and experimental results illustrate excellent operation of the proposed principle .

	AC/AC THREE PHASE CONVERTER OPERATING WITH UNITY POWER FACTOR AND SINUSOIDAL INPUT CURRENT By W. Koczara; B. Dakyo; L. Protin	[View] [Download]
Abstract: A concept of unity power factor, sinusoidal current ac/ac voltage converter and its control idea is described. A classical ac/ac thyristor converter is equiped in parallel full controlled ac/dc converter. This additional converter operates as an active filter. An actual current rate is limited only by supply line inductance. The active filter actual currents rate depends on the additional inductance on ac side and dc voltage. The paper describes conditions of load and active filter inductance of the active filter and dc voltage which are required to produce sinusoidal current input. Results of simulation and laboratory tests of the modified ac/ac converter which controls continuously output power and input current are presented.

	A NEW APPROACH TO HARMONIC COMPENSATION WITH HYBRID ACTIVE FILTERS By Angel Antonio Bayod Rujula; Mariano Sanz Badia	[View] [Download]
Abstract: This paper presents a combined system of passive filter and small-rated active filters. A new compensation principle is described, obtaining current in the source and voltage at the pec both sinusoidal, and improvement in the power factor. The ftltering characteristics are discussed theoretically and several situations are simulated.

	AN ACTIVE POWER FILTER AND UNBALANCED CURRENT COMPENSATOR CONTROL CIRCUIT By P. Verdelho; G. D. Marques	[View] [Download]
Abstract: This paper presents a control circuit for the three phase PWM voltage converter connected to the AC mains when used as an active power filter and unbalanced current compensator. A decoupled system in Park's variables is achieved and so simple controllers with excellent performance can be used. The controllers are implemented directly in the Park's referential. Expressions for the controller's synthesis are derived. Experimental results from a 2 kVA IGBT prototype showing the dynamic and steady state system's performances are presented.