EPE Association: EPE 1997 – 46: Dialogue Session DS9c: POWER CONDITIONING, POWER FACTOR CORRECTION

EPE 1997 – 46: Dialogue Session DS9c: POWER CONDITIONING, POWER FACTOR CORRECTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 46: Dialogue Session DS9c: POWER CONDITIONING, POWER FACTOR CORRECTION

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   OPTIMUM DIODE-SWITCHED ACTIVE FILTERS FOR POWER FACTOR CORRECTION OF SINGLE- AND THREE-PHASE DIODE RECTIFIERS WITH CAPACITIVE SMOOTHING
By Vello Sarv; Tiiu Sakkos; Jüri Soojärv [View]
[Download]

Abstract: A novel design principle and optimum schemes of low-distorting single- and three-phase diode rectifiers with capacitive smoothing using diode-switched-inductor and diode-switched-transformer active filters are proposed and analyzed. The power factor correction technique proposed is based on the second-harmonic power conversion in single-phase rectifiers and the third-harmonic power conversion in three-phase rectifiers to an additional quantity of dc power in the active filter. More precisely, such a conversion takes place in an appropriate controlled current source implemented by a current-shaping time-variable inductor or transformer. To implement diode rectifiers with sinusoidal supply currents, continuous inductance or transformation ratio variation is needed. Nevertheless, a proper stepped variation of the filter inductance or that of the transformation ratio enables to synthesize diode rectifiers with high power factor using only the simplest diode switches.

   A SINGLE-PHASE RECTIFIER WITH REDUCED CURRENT RIPPLE AND POWER FACTOR CORRECTION
By J.-M. Meyer; A. Rufer [View]
[Download]

Abstract: In this paper, a high quality single-phase rectifier with reduced ripple of the input current is proposed. The chosen solution has the main advantage of reducing either the current ripple or the operating switching frequency, by a compensation effect of two imbricated channels, pulsating in opposition phase. The new rectifier topology is presented, with an appropriate control scheme. Simulation of the behaviour with control circuits are presented, together with experimental results.

   A THREE-PHASE PWM RECTIFIER WITHOUT VOLTAGE SENSORS
By T. Ohnuki; 0. Miyashita; Philippe Lataire; Gaston Maggetto [View]
[Download]

Abstract: A control scheme for a three-phase PWM rectifier without any voltage sensors is proposed. Only two input line-currents are measured. In the PWM rectifier controller, all the voltage values required for control are estimated from the measured line currents and the calculated input reactor voltage values in the switch-modes of the rectifier circuit. The input reactor voltage can be 'obtained by a differentiator that produces the derivative of the line current. Another way of detection of the reactor voltage consists in the use of a secondary winding wound on the input reactor instead of the differentiator. In this case, all the voltage values required for controlling the rectifier are estimated from the seCondary-winding voltage with isolated condition between the main circuit and the controller. The proposed method is verified by experiment. This paper describes the estimation method and configuration of the controller, and discusses steady-state and transient performances of the rectifier.

   CAPACITOR CURRENT AND VOLTAGE RIPPLE REDUCTION IN AC/DC CONVERTERS WITH POWER FACTOR CORRECTION
By L. Latkovskis; J. Stabulnieks [View]
[Download]

Abstract: In AC/DC converters with power factor correction both the output voltage ripple and capacitor RMS current can be reduced by means of control. Assessment of some controllers, based on simulation results, is given. Interaction between such type of converters and uncontrolled rectifiers with a capacitive filter is also discussed. The power range available to meet the IEC 555-2 limitations is calculated, too.

   Current-Fed Three-Phase Converter and Voltage-Fed Three-Phase Converter using Optimum PWM Pattern and Their Performance Evaluation
By Y. Konishi; E. Hiraki; Y. Matsumoto; Y. L. Feng; M. Nakaoka [View]
[Download]

Abstract: This paper describes a new method to select the optimum PWM patterns and a procedure to design a low-pass filter in a large-capacity current-source-fed active PWM converter which is used to suppress higher harmonics flowing into the utility-grid power source. A feasible test is carried out using a 500kVA active PWM converter designed for unique considerations mentioned above. It is verified that these new considerations are effective to minimize higher harmonic current components flowing into the utility-grid AC line. Furthermore, this experimental work provides highly efficient AC/DC converter characteristics under a unity power factor correction and sinewave line current shaping schemes. Finally, this paper indicates that the optimum PWM pattern can be applied to the voltage source converter and has an excellent switching performance as compared with conventional PWM modulation.

   ANALYTICAL APPROACH OF SWITCHING BEHAVIOUR AND MODELING OF SINGLE PHASE PARALLEL STRUCTURE OF BOOST TYPE POWER FACTOR CORRECTOR
By J. C. Le Bunetel; B. Dakyo; L. Protin; W. Koczara [View]
[Download]

Abstract: We have introduced a concept of parallel connexion of Boost type power factor corrector. This structure is aimed to solve power-frequency dilemma by means of a power dispatching over a finite number of complementary converters. In this paper the sizing of these converters is analytically studied. Very relevant harmonic modelling of such converters is introduced to obtain a description of switching phenomena. The power dispatching key of 90% and 10% id used to check feasability on reduced size systems for laboratory tests purpose.

   APPLICATION OF MICROMACHINED TECHNOLOGY TO EFFECTIVE POWER FACTOR CORRECTION
By W. Wojciak; T. Pozniak; A. Napieralski; M. Orlikowski; M. Zubert [View]
[Download]

Abstract: The paper presents the application of the electro-thermal converter fabricated in micromachined CMOS technology to the power factor correction. In MEMS technology electro-mechanical devices are integrated on the same chip together with analogue and digital electronics which process signals from micromachined sensors and create control signals for power electronics and actuators.

EPE 1997 – 46: Dialogue Session DS9c: POWER CONDITIONING, POWER FACTOR CORRECTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 46: Dialogue Session DS9c: POWER CONDITIONING, POWER FACTOR CORRECTION
	[return to parent folder]

	OPTIMUM DIODE-SWITCHED ACTIVE FILTERS FOR POWER FACTOR CORRECTION OF SINGLE- AND THREE-PHASE DIODE RECTIFIERS WITH CAPACITIVE SMOOTHING By Vello Sarv; Tiiu Sakkos; Jüri Soojärv	[View] [Download]
Abstract: A novel design principle and optimum schemes of low-distorting single- and three-phase diode rectifiers with capacitive smoothing using diode-switched-inductor and diode-switched-transformer active filters are proposed and analyzed. The power factor correction technique proposed is based on the second-harmonic power conversion in single-phase rectifiers and the third-harmonic power conversion in three-phase rectifiers to an additional quantity of dc power in the active filter. More precisely, such a conversion takes place in an appropriate controlled current source implemented by a current-shaping time-variable inductor or transformer. To implement diode rectifiers with sinusoidal supply currents, continuous inductance or transformation ratio variation is needed. Nevertheless, a proper stepped variation of the filter inductance or that of the transformation ratio enables to synthesize diode rectifiers with high power factor using only the simplest diode switches.

	A SINGLE-PHASE RECTIFIER WITH REDUCED CURRENT RIPPLE AND POWER FACTOR CORRECTION By J.-M. Meyer; A. Rufer	[View] [Download]
Abstract: In this paper, a high quality single-phase rectifier with reduced ripple of the input current is proposed. The chosen solution has the main advantage of reducing either the current ripple or the operating switching frequency, by a compensation effect of two imbricated channels, pulsating in opposition phase. The new rectifier topology is presented, with an appropriate control scheme. Simulation of the behaviour with control circuits are presented, together with experimental results.

	A THREE-PHASE PWM RECTIFIER WITHOUT VOLTAGE SENSORS By T. Ohnuki; 0. Miyashita; Philippe Lataire; Gaston Maggetto	[View] [Download]
Abstract: A control scheme for a three-phase PWM rectifier without any voltage sensors is proposed. Only two input line-currents are measured. In the PWM rectifier controller, all the voltage values required for control are estimated from the measured line currents and the calculated input reactor voltage values in the switch-modes of the rectifier circuit. The input reactor voltage can be 'obtained by a differentiator that produces the derivative of the line current. Another way of detection of the reactor voltage consists in the use of a secondary winding wound on the input reactor instead of the differentiator. In this case, all the voltage values required for controlling the rectifier are estimated from the seCondary-winding voltage with isolated condition between the main circuit and the controller. The proposed method is verified by experiment. This paper describes the estimation method and configuration of the controller, and discusses steady-state and transient performances of the rectifier.

	CAPACITOR CURRENT AND VOLTAGE RIPPLE REDUCTION IN AC/DC CONVERTERS WITH POWER FACTOR CORRECTION By L. Latkovskis; J. Stabulnieks	[View] [Download]
Abstract: In AC/DC converters with power factor correction both the output voltage ripple and capacitor RMS current can be reduced by means of control. Assessment of some controllers, based on simulation results, is given. Interaction between such type of converters and uncontrolled rectifiers with a capacitive filter is also discussed. The power range available to meet the IEC 555-2 limitations is calculated, too.

	Current-Fed Three-Phase Converter and Voltage-Fed Three-Phase Converter using Optimum PWM Pattern and Their Performance Evaluation By Y. Konishi; E. Hiraki; Y. Matsumoto; Y. L. Feng; M. Nakaoka	[View] [Download]
Abstract: This paper describes a new method to select the optimum PWM patterns and a procedure to design a low-pass filter in a large-capacity current-source-fed active PWM converter which is used to suppress higher harmonics flowing into the utility-grid power source. A feasible test is carried out using a 500kVA active PWM converter designed for unique considerations mentioned above. It is verified that these new considerations are effective to minimize higher harmonic current components flowing into the utility-grid AC line. Furthermore, this experimental work provides highly efficient AC/DC converter characteristics under a unity power factor correction and sinewave line current shaping schemes. Finally, this paper indicates that the optimum PWM pattern can be applied to the voltage source converter and has an excellent switching performance as compared with conventional PWM modulation.

	ANALYTICAL APPROACH OF SWITCHING BEHAVIOUR AND MODELING OF SINGLE PHASE PARALLEL STRUCTURE OF BOOST TYPE POWER FACTOR CORRECTOR By J. C. Le Bunetel; B. Dakyo; L. Protin; W. Koczara	[View] [Download]
Abstract: We have introduced a concept of parallel connexion of Boost type power factor corrector. This structure is aimed to solve power-frequency dilemma by means of a power dispatching over a finite number of complementary converters. In this paper the sizing of these converters is analytically studied. Very relevant harmonic modelling of such converters is introduced to obtain a description of switching phenomena. The power dispatching key of 90% and 10% id used to check feasability on reduced size systems for laboratory tests purpose.

	APPLICATION OF MICROMACHINED TECHNOLOGY TO EFFECTIVE POWER FACTOR CORRECTION By W. Wojciak; T. Pozniak; A. Napieralski; M. Orlikowski; M. Zubert	[View] [Download]
Abstract: The paper presents the application of the electro-thermal converter fabricated in micromachined CMOS technology to the power factor correction. In MEMS technology electro-mechanical devices are integrated on the same chip together with analogue and digital electronics which process signals from micromachined sensors and create control signals for power electronics and actuators.