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1
Content available Dead time effects compensation strategy by third harmonic injection for a five-phase inverter
Łuksza Krzysztof, Kondratenko Dmytro, Lewicki Arkadiusz
Archives of Electrical Engineering
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2024
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Vol. 73, nr 1
17--35
EN
This paper proposes a method for compensation of dead-time effects for a five-phase inverter. In the proposed method an additional control subsystem was added to the field-oriented control (FOC) scheme in the coordinate system mapped to the third harmonic. The additional control loop operates in the fixed, orthogonal reference frame (α − β coordinates) without the need for additional Park transformations. The purpose of this method is to minimize the dead-time effects by third harmonic injection in two modes of operation of the FOC control system: with sinusoidal supply and with trapezoidal supply. The effectiveness of the proposed control method was verified experimentally on a laboratory setup with a prototype five-phase interior permanent magnet synchronous machine (IPMSM). All experimental results were presented and discussed in the following paper.
2
Content available Augmented speed control scheme of dual induction motors with mutual flux angle control loop
Kondratenko Dmytro, Lewicki Arkadiusz, Łuksza Krzysztof
Archives of Electrical Engineering
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2023
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Vol. 72, nr 4
915--930
EN
This paper proposes an augmented speed control scheme of dual induction motors fed by a five-leg voltage source inverter (VSI) with a common/shared-leg. An additional control loop is proposed here and based on the mutual flux angle – the difference between flux angular positions of the IMs. The main purpose of this research is to minimize the energy losses in the common inverter leg by controlling the mutual flux angle, at equal angular speeds of both motors. Simulation and experimental studies were carried out and the effectiveness of the proposed control method was proven. The PLECS software package was used for the simulation tests. The laboratory prototypewas prepared for the experimental validation. All results were provided and discussed in this paper.
3
Content available remote Redukcja liczby przełączeń tranzystorów w falowniku kaskadowym z wektorową modulacją szerokości impulsów
Lewicki Arkadiusz, Szewczyk Janusz, Krzemiński Zbigniew, Morawiec Marcin
Przegląd Elektrotechniczny
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2020
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R. 96, nr 7
47--53
PL
W artykule zaprezentowano metody ograniczania liczby przełączeń tranzystorów wybranych mostków kaskadowego falownika napięcia z wektorową modulacją szerokości impulsów. Zaproponowane rozwiązanie umożliwi sterowanie temperaturą poszczególnych mostków H przekształtnika, w którym ten sam strumień powietrza wykorzystano do chłodzenia kilku mostków H. Zmiana liczby przełączanych tranzystorów nie wpływa na dokładność formowania napięć wyjściowych oraz nie ogranicza możliwości utrzymania równomiernego rozkładu napięcia na kondensatorach obwodów DC.
EN
The paper presents methods for limiting the number of transistor switching in selected H-bridges of a medium voltage CHB inverter with Space Vector Pulse Width Modulation. The proposed solution enables the temperature control of individual H-Bridges, where the same air flow is utilized for several H-bridges cooling. The change in the commutation number does not affect the accuracy of generating the output voltage and does not limit the ability to maintain an even DC-link voltage distribution.
4
Content available Ant-based clustering for flow graph mining
Lewicki Arkadiusz, Pancerz Krzysztof
International Journal of Applied Mathematics and Computer Science
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2020
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Vol. 30, no. 3
561--572
EN
The paper is devoted to the problem of mining graph data. The goal of this process is to discover possibly certain sequences appearing in data. Both rough set flow graphs and fuzzy flow graphs are used to represent sequences of items originally arranged in tables representing information systems. Information systems are considered in the Pawlak sense, as knowledge representation systems. In the paper, an approach involving ant based clustering is proposed. We show that ant based clustering can be used not only for building possible large groups of similar objects, but also to build larger structures (in our case, sequences) of objects to obtain or preserve the desired properties.
5
Content available Open-Phase Fault Detection Method for Sensorless Five-Phase Induction Motor Drives with an Inverter Output Filter
Strankowski Patryk, Guziński Jarosław, Wilczyński Filip, Morawiec Marcin, Lewicki Arkadiusz
Power Electronics and Drives
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2019
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Vol. 4 (39)
189--200
EN
The paper presents the sensorless five-phase induction motor drive implementation with an inverter output filter with third harmonic injection. For the sensorless operation, the required observers are presented for the first and third harmonics with consideration of the inverter output filter. Moreover, the interaction of the observers and the control system is capable to handle a deactivation of one or two phases, which improves the reliability of the complete drive system. A new idea of online open-phase fault detection is presented based on the frequency analysis of the estimated observer variables. The test setup, fault operation capabilities and an experimental verification of the proposed fault detection method are presented in the paper.
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