New family of matrix-reactance frequency converters based on unipolar PWM AC matrix-reactance choppers

Fedyczak, Z.; Szcześniak, Paweł; Korotyeyev, Igor

doi:10.1109/epepemc.2008.4635272

Cited by 19 publications

(7 citation statements)

References 11 publications

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“…In order to solve this problem, a matrix-reactance frequency converter (MRFC), which consists of an MC and an AC chopper, has been studied (7) (8) . References (7) and (8) showed that the amplitude of the output voltage is controlled such that it is higher than the input voltage.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Evaluation of a Matrix Converter with a Boost-Up AC Chopper in an Adjustable Drive System

Koiwa

Itoh

2014

IEEJ Journal IA

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This paper proposes a circuit topology for a matrix converter with a boost-up AC chopper in the input stage in order to improve the voltage transfer ratio, which is defined as the ratio between the input and output voltages. The proposed system is applied in an IPMSM adjustable speed drive system where the application range of flux-weakening control is wide. In order to drive the motor at the rated speed in the high-torque region, there are three possible solutions: (i) applying flux-weakening control, (ii) boosting up the voltage by the AC chopper or (iii) a combination of both the solutions (i) and (ii). In terms of the total loss, the proposed system with the solutions (ii) or (iii) is compared with the conventional matrix converter by using solution (i). Consequently, the chopper loss in the AC chopper and the copper loss of the motor are calculated theoretically to evaluate the total loss. In addition, the proposed system is demonstrated as a 3.7-kW prototype by experiments. In this paper, the input voltage is degraded so that a larger boost-up ratio can be applied to the AC chopper. Further, the proposed system is compared to the conventional matrix converter by expanding the range of flux-weakening control, which depends on the input voltage. As a result, it is confirmed that the converter efficiency of the proposed system reaches 94.8% at the maximum point. Furthermore, it is revealed that the efficiency of the proposed system is higher when the rated motor voltage is greater than 107% of the input voltage.

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Section: Introductionmentioning

confidence: 99%

Efficiency Evaluation of a Matrix Converter with a Boost-Up AC Chopper in an Adjustable Drive System

Koiwa

Itoh

2014

IEEJ Journal IA

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“…Frequency converters used to control AC voltages can be built on structures of a matrix converters (MC) or matrix-reactance chopper (MRC). These systems allow to control both frequency and magnitude of an output voltage [1][2][3]. Mathematical models of converters are widely used to analyze the theoretical properties of such systems.…”

Section: Introductionmentioning

confidence: 99%

Analysis of three-phases matrix reactance frequency converter with two pulsations of control signal

Korotyeye¹,

Zięba²

2012

Archives of Electrical Engineering

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Analysis of three-phases matrix reactance frequency converter with two pulsations of control signalThis paper presents a method of calculation of steady-state processes in three-phases matrix-reactance frequency converters (MRFC's), in which voltages and currents are transformed by control signals with two pulsations. A solution of nonstationary differential equations with periodic coefficients that describe this system is obtained by using Galerkin's method and an extension of equations of one variable of time to equations of two variables of time. The results of calculations are presented in an example of three-phases MRFC with buck-boost topology and compared with a numerical method embedded in the program Mathematica.

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“…First an MRFC based on buck-boost topology (MRFC-I-buck-boost), shown in Fig. 1, will be analyzed [10]. The descriptions, in general form, of the control strategy of the discussed MRFCs is shown in Figure 2 [12].…”

Section: Description Of the Analyzed Matrix-reactance Frequency Convementioning

confidence: 99%

“…The family of MCRFCs contains 9 topologies -two topologies based on buck-boost, Ćuk, SEPIC and Zeta topologies and one based on the boost topology [10], [12]. First an MRFC based on buck-boost topology (MRFC-I-buck-boost), shown in Fig.…”

Section: Description Of the Analyzed Matrix-reactance Frequency Convementioning

confidence: 99%

“…The most common is the matrix converter (MC) topology [7]. Another group of AC-AC frequency converters with a buck-boost voltage transformation possibility and without DC energy storage is proposed in [10]- [12], and are known as matrix-reactance frequency converters (MRFC). The expected benefit of these converters is the voltage transfer ratio which is much greater than one and depends on reactive elements [12].…”

Section: Introductionmentioning

confidence: 99%

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A Comparison Between Two Average Modelling Techniques of AC-AC Power Converters

Szcześniak¹

2015

IJPEDS

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In this paper, a comparative evaluation of two modelling tools for switching AC-AC power converters is presented. Both of them are based on average modelling techniques. The first approach is based on the circuit averaging technique and consists in the topological manipulations, applied to a converter states. The second approach makes use of a state-space averaged model of the converter and is based on analytical manipulations using the different state representations of a converter. The two modelling techniques are applied to a same AC-AC called matrix-reactance frequency converter based on buck-boost topology. These techniques are compared on the basis of their rapidity, quantity of calculations and transformations and its limitations. Keyword:Averaged model Buck-boost topology Matrix converter Modelling Power converters Copyright © 2015 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Paweł Szcześniak, Institute of Electrical Engineering, University of Zielona Gora, 65-246 Zielona Góra, Podgorn1 50, Poland. Email: P.Szczesniak@iee.uz.zgora.pl INTRODUCTIONModelling a power electronic converter is a complex issue due to the fact of digital control complexity and high number of power converter components. Furthermore, given the increasing number of different modulation strategies, it is necessary to study their impact in converter operation. In order to achieve their goal power converters must be appropriately modelled in simulation or analytical studies. Hence it is necessary to create simple models. The problem has been largely studied and a wide variety of models have been proposed [1]- [6]. However, the use of those models and their simulation in a computer still requires a large amount of resources and circuit simplification and mathematical transformations. In this paper, a comparative evaluation of two modelling approach of complex direct AC-AC frequency converters is presented. The presented modelling methods are based on circuit averaging technique [1], [5] and statespace averaged model [5].The change of frequency in AC voltage is now one of the important functions of solid state power converters. The most desirable features of frequency converters include the possibility of generating load voltages with arbitrary amplitude and generating sinusoidal source and load currents and voltage waveforms, the possibility of providing unity power factor for any load, and finally, their construction using a simple and compact power circuit. The past few years have witnessed remarkable progress in research into direct power AC-AC frequency converters without a DC energy storage element. Many exciting applications have been developed [7]- [12]. The most common is the matrix converter (MC) topology [7]. Another group of AC-AC frequency converters with a buck-boost voltage transformation possibility and without DC energy storage is proposed in [10]-[12], and are known as matrix-reactance frequency converters (MRFC). The expected benefit of these converters is the voltage transfer...

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New family of matrix-reactance frequency converters based on unipolar PWM AC matrix-reactance choppers

Cited by 19 publications

References 11 publications

Efficiency Evaluation of a Matrix Converter with a Boost-Up AC Chopper in an Adjustable Drive System

Efficiency Evaluation of a Matrix Converter with a Boost-Up AC Chopper in an Adjustable Drive System

Analysis of three-phases matrix reactance frequency converter with two pulsations of control signal

A Comparison Between Two Average Modelling Techniques of AC-AC Power Converters

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