Unity Power Factor at the Power Supply Side for MATRIX Converter Fed PMSM Drives

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...

“…Both modelling approach can be used to modelling of direct frecuency converters with different number of intput/output phases [20] and different loads [19], [21] …”

Section: Comparison Of Presented Modelling Techniquesmentioning

confidence: 99%

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

Szcześniak¹

2015

Comparative Performance Study for Closed Loop Operation of an Adjustable Speed Permanent Magnet Synchronous Motor Drive with Different Controllers

Sain¹,

Banerjee²,

Biswas⃰³

2016

In this paper an extensive comparative study is carried out between PI and PID controlled closed loop model of an adjustable speed Permanent Magnet Synchronous Motor (PMSM) drive. The incorporation of Sinusoidal Pulse Width Modulation (SPWM) strategy establishes near sinusoidal armature phase currents and comparatively less torque ripples without sacrificing torque/weight ratio. In this closed loop model of PMSM drive, the information about reference speed is provided to a speed controller, to ensure that actual drive speed tracks the reference speed with ideally zero steady state speed error. The entire model of PMSM closed loop drive is divided into two loops, inner loop current and outer loop speed. By taking the different combinations of two classical controllers (PI & PID) related with two loop control structure, different approximations are carried out. Hence a typical comparative study is introduced to familiar with the different performance indices of the system corresponding to time domain and frequency domain specifications. Therefore overall performance of closed loop PMSM drive is tested and effectiveness of controllers will be determined for different combinations.

Direct Torque Control Strategy of PMSM Employing Ultra Sparse Matrix Converter

Yuhendri¹,

Ahyanuardi

Aswardi

2018

Matrix converter is a good choice for Permanent Magnet Synchronous Motor (PMSM) drives, because it has high power density and does not require dc-link energy storage. the disadvantages of conventional matrix converter is using 18 active switches, so it becomes expensive and the modulation method becomes more complicated than back to back converter. To minimize this problem, this paper proposes variable speed drive of PMSM using Ultra Sparse Matrix Converter (USMC) based on Direct Torque Control (DTC) methods. This converter uses only 9 active switches, making it cheaper than conventional matrix converter. DTC is designed based on Space Vector Modulation (SVM) to reduce torque and flux ripples due to the hysteresis control in conventional DTC. The simulation results show that DTC based SVM using USMC effectively controls the rotor speed with low torque and flux ripples.