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Prof. Dr. Pawel Szczepankowski
Gdansk University of Technology, 11/12 Narutowicza st., 80-233 Gdańsk, Poland

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Research Keywords & Expertise

0 Power Converters
0 Multilevel converters
0 pulse width modulation
0 Energy conversion and storage
0 Motor Drive And Its Control

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Dataset
Published: 17 June 2021
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This Dataset, as a Matlab script, shows input voltages vectors and output voltage reference vector for improved control of input power factor in Multiphase Conventional Matrix Converters (MCMC) using the transfer function of the load angle. Compared to the direct space--vector modulation techniques, the proposed solution can rely on the load parameters and obtain the greater value of an input displacement angle in a certain range of voltage transfer ratio and the load power factor. The proposed concept is based on the Direct Analytic Voltage PWM (DAV--PWM) modulation with an elliptical trajectory of reference load voltages. The concept includes and extends the Venturini approach to the voltage gain equal to 0.75 and any number of output phases.

ACS Style

Pawel Szczepankowski. An Improved Control of the Nonunity Input Power Factor for Classic Multiphase Matrix Converters. 2021, 1 .

AMA Style

Pawel Szczepankowski. An Improved Control of the Nonunity Input Power Factor for Classic Multiphase Matrix Converters. . 2021; ():1.

Chicago/Turabian Style

Pawel Szczepankowski. 2021. "An Improved Control of the Nonunity Input Power Factor for Classic Multiphase Matrix Converters." , no. : 1.

Journal article
Published: 28 January 2021 in Energies
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In this paper, different Pulse Width Modulation (PWM) strategies for operating with a low-switching frequency, a topology that combines Conventional Matrix Converters (CMCs), and Coupled Reactors (CRs) are presented and discussed. The principles of the proposed strategies are first discussed by a conceptual analysis and later validated by simulation. The paper shows how the combination of CMCs and CRs could be of special interest for sharing the current among these converters’ modules, being possible to scale this solution to be a modular system. Therefore, the use of coupled reactors allows one to implement phase shifters that give the solution the ability to generate a stair-case load voltage with the desired power quality even the matrix converters are operated with a low-switching frequency close to the grid frequency. The papers also address how the volume and weight of the coupled reactors decrease with the growth of the fundamental output frequency, making this solution especially appropriate for high power applications that are supplied at high AC frequencies (for example, in airport terminals, where a supply of 400 Hz is required).

ACS Style

Pawel Szczepankowski; Jaroslaw Luszcz; Alexander Usoltsev; Natalia Strzelecka; Enrique Romero-Cadaval. The Conceptual Research over Low-Switching Modulation Strategy for Matrix Converters with the Coupled Reactors. Energies 2021, 14, 675 .

AMA Style

Pawel Szczepankowski, Jaroslaw Luszcz, Alexander Usoltsev, Natalia Strzelecka, Enrique Romero-Cadaval. The Conceptual Research over Low-Switching Modulation Strategy for Matrix Converters with the Coupled Reactors. Energies. 2021; 14 (3):675.

Chicago/Turabian Style

Pawel Szczepankowski; Jaroslaw Luszcz; Alexander Usoltsev; Natalia Strzelecka; Enrique Romero-Cadaval. 2021. "The Conceptual Research over Low-Switching Modulation Strategy for Matrix Converters with the Coupled Reactors." Energies 14, no. 3: 675.

Journal article
Published: 17 January 2021 in Energies
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This article presents three variants of the Pulse Width Modulation (PWM) for the Double Square Multiphase type Conventional Matrix Converters (DSM-CMC) supplying loads with the open-end winding. The first variant of PWM offers the ability to obtain zero value of the common-mode voltage at the load’s terminals and applies only six switches within the modulation period. The second proposal archives for less Total Harmonic Distortion (THD) of the generated load voltage. The third variant of modulation concerns maximizing the voltage transfer ratio, minimizing the number of switching, and the common-mode voltage cancellation. The discussed modulations are based on the concept of sinusoidal voltage quadrature signals, which can be an effective alternative to the classic space-vector approach. In the proposed approach, the geometrical arrangement of basic vectors needed to synthesize output voltages is built from the less number of vectors, which is equal to the number of the matrix converter’s terminals. The PWM duty cycle computation is performed using only a second-order determinant of the voltages coordinate matrix without using trigonometric functions. A new approach to the PWM duty cycles computing and the load voltage synthesis by 5 × 5 and 12 × 12 topologies has been verified using the PSIM simulation software.

ACS Style

Pawel Szczepankowski; Natalia Strzelecka; Enrique Romero-Cadaval. A New Approach to the PWM Modulation for the Multiphase Matrix Converters Supplying Loads with Open-End Winding. Energies 2021, 14, 466 .

AMA Style

Pawel Szczepankowski, Natalia Strzelecka, Enrique Romero-Cadaval. A New Approach to the PWM Modulation for the Multiphase Matrix Converters Supplying Loads with Open-End Winding. Energies. 2021; 14 (2):466.

Chicago/Turabian Style

Pawel Szczepankowski; Natalia Strzelecka; Enrique Romero-Cadaval. 2021. "A New Approach to the PWM Modulation for the Multiphase Matrix Converters Supplying Loads with Open-End Winding." Energies 14, no. 2: 466.

Journal article
Published: 27 August 2020 in Energies
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This paper proposes and discusses a concept of a hybrid modulation for the control of modular voltage source inverters with coupled reactors. The use of coupled reactors as the integrating elements leads to significant reduction in the size and weight of the circuit. The proposed modulation combines novel coarsely quantized pulse amplitude modulation (CQ-PAM) and innovative space-vector pulse width modulation (SVPWM). The former enjoys very low transistor switching frequency and low harmonic elimination, while the latter ensures high resolution of amplitude control. The SVPWM is based on the use of barycentric coordinates. The feasibility of the proposed solution is verified by simulations and laboratory tests of a 12-pulse modular voltage source inverters with two-level and three-level component inverters.

ACS Style

Krzysztof Jakub Szwarc; Paweł Szczepankowski; Janusz Nieznański; Cezary Swinarski; Aleksandr Usoltsev; Ryszard Strzelecki. Hybrid Modulation for Modular Voltage Source Inverters with Coupled Reactors. Energies 2020, 13, 4450 .

AMA Style

Krzysztof Jakub Szwarc, Paweł Szczepankowski, Janusz Nieznański, Cezary Swinarski, Aleksandr Usoltsev, Ryszard Strzelecki. Hybrid Modulation for Modular Voltage Source Inverters with Coupled Reactors. Energies. 2020; 13 (17):4450.

Chicago/Turabian Style

Krzysztof Jakub Szwarc; Paweł Szczepankowski; Janusz Nieznański; Cezary Swinarski; Aleksandr Usoltsev; Ryszard Strzelecki. 2020. "Hybrid Modulation for Modular Voltage Source Inverters with Coupled Reactors." Energies 13, no. 17: 4450.

Journal article
Published: 28 January 2020 in IEEE Access
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This paper proposes the generalized direct modulation for Conventional Matrix Converters (CMC) using the concept of analytical signals and barycentric coordinates. The paper proposes a novel approach to the Pulse Width Modulation (PWM) duty cycle computing, which allows faster prototyping of direct control algorithms. The explanation of the new idea using analytical considerations demonstrating the principles of direct voltage synthesis has been presented in the article. The study concerns mainly the CMC3 × 3 but solutions for 3 × n, 5 × 5, and 5 × 3 topologies have also been discussed. The transformation of instantaneous input voltages to analytic signals great permits for simple presenting of real input voltage conditions such as waveform type, asymmetry or other deformation like higher–order harmonics. The proposed interpolation methods allow for determining the values of PWM duty cycles using simple formulas based on the determinants of the 2nd–degree matrices. Therefore, the proposed method, which based on the barycentric coordinates, frees an algorithm from trigonometry and angles.

ACS Style

Pawel Szczepankowski; Tomasz Bajdecki; Ryszard Strzelecki. Direct Modulation for Conventional Matrix Converters Using Analytical Signals and Barycentric Coordinates. IEEE Access 2020, 8, 22592 -22616.

AMA Style

Pawel Szczepankowski, Tomasz Bajdecki, Ryszard Strzelecki. Direct Modulation for Conventional Matrix Converters Using Analytical Signals and Barycentric Coordinates. IEEE Access. 2020; 8 (99):22592-22616.

Chicago/Turabian Style

Pawel Szczepankowski; Tomasz Bajdecki; Ryszard Strzelecki. 2020. "Direct Modulation for Conventional Matrix Converters Using Analytical Signals and Barycentric Coordinates." IEEE Access 8, no. 99: 22592-22616.

Journal article
Published: 03 January 2020 in IEEE Access
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ACS Style

Pawel Szczepankowski; Nikolai Poliakov; Denis Vertegel; Krzysztof Jakub Szwarc; Ryszard Strzelecki. A New Concept of PWM Duty Cycle Computation Using the Barycentric Coordinates in a Three–Dimensional Voltage Vectors Arrangement. IEEE Access 2020, 8, 8019 -8031.

AMA Style

Pawel Szczepankowski, Nikolai Poliakov, Denis Vertegel, Krzysztof Jakub Szwarc, Ryszard Strzelecki. A New Concept of PWM Duty Cycle Computation Using the Barycentric Coordinates in a Three–Dimensional Voltage Vectors Arrangement. IEEE Access. 2020; 8 ():8019-8031.

Chicago/Turabian Style

Pawel Szczepankowski; Nikolai Poliakov; Denis Vertegel; Krzysztof Jakub Szwarc; Ryszard Strzelecki. 2020. "A New Concept of PWM Duty Cycle Computation Using the Barycentric Coordinates in a Three–Dimensional Voltage Vectors Arrangement." IEEE Access 8, no. : 8019-8031.

Journal article
Published: 19 December 2019 in IEEE Transactions on Industrial Electronics
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The paper proposes an alternative and novel approach to the PWM duty cycles computation for Conventional Matrix Converters (CMC) fed by balanced, unbalanced or non-sinusoidal AC voltage sources. The presented solution simplifies the prototyping of direct modulation algorithms. PWM duty cycles are calculated faster by the smooth interpolation technique, using only vector coordinates, without trigonometric functions and angles. Both input voltages and output reference voltages are expressed by analytic signals in the proposed direct modulation. Input voltages are represented by the rotating vector collection in the two-dimensional Cartesian coordinate system. All reference output voltages are located inside the triangular surface, named here as the voltage synthesis field, formed by these rotating vectors. A certain degree of reference signals placement freedom allows to maximize the voltage transfer ratio to 0:866 with less switching compared to the Optimum-Venturini direct method. The proposed solution was verified by simulations and experiments for CMC3 × k. The comparison with the Optimum-Venturini modulation is included. The proposed PWM duty cycle computation approach can also be applied to multiphase CMC converters for any number of inputs as well as outputs.

ACS Style

Pawel Szczepankowski; Patrick Wheeler; Tomasz Bajdecki. Application of Analytic Signal and Smooth Interpolation in Pulsewidth Modulation for Conventional Matrix Converters. IEEE Transactions on Industrial Electronics 2019, 67, 10011 -10023.

AMA Style

Pawel Szczepankowski, Patrick Wheeler, Tomasz Bajdecki. Application of Analytic Signal and Smooth Interpolation in Pulsewidth Modulation for Conventional Matrix Converters. IEEE Transactions on Industrial Electronics. 2019; 67 (12):10011-10023.

Chicago/Turabian Style

Pawel Szczepankowski; Patrick Wheeler; Tomasz Bajdecki. 2019. "Application of Analytic Signal and Smooth Interpolation in Pulsewidth Modulation for Conventional Matrix Converters." IEEE Transactions on Industrial Electronics 67, no. 12: 10011-10023.

Journal article
Published: 06 May 2019 in IEEE Access
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This paper proposes the use of barycentric coordinates in the development and implementation of space–vector pulse–width modulation (SVPWM) methods, especially for inverters with deformed space–vector diagrams. The proposed approach is capable of explicit calculation of vector duty cycles, independent of whether they assume ideal positions or are displaced due to the DC–link voltage imbalance. The use of barycentric coordinates also permits a well–defined and universal approach to the problem of identifying the region in which the reference vector is located. It completely avoids the use of angles, trigonometric functions and inverse trigonometric functions and is chiefly based on matrix operations which are well suited for digital signal processor implementation. The proposed approach is exposed and validated for the special case of three–level neutral–point clamped (NPC) inverter controlled by a discontinuous space–vector PWM.

ACS Style

Pawel Szczepankowski; Janusz Nieznanski. Application of Barycentric Coordinates in Space Vector PWM Computations. IEEE Access 2019, 7, 91499 -91508.

AMA Style

Pawel Szczepankowski, Janusz Nieznanski. Application of Barycentric Coordinates in Space Vector PWM Computations. IEEE Access. 2019; 7 (99):91499-91508.

Chicago/Turabian Style

Pawel Szczepankowski; Janusz Nieznanski. 2019. "Application of Barycentric Coordinates in Space Vector PWM Computations." IEEE Access 7, no. 99: 91499-91508.