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    Wyświetlanie 1-15 z 15
    Tytuł:
    Multilevel Converters
    Autorzy:
    Bauer, P.
    Kazmierkowski, M. P.
    Strzelecki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/200223.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przetwornik
    przetwornik wielopoziomowy
    multilevel converter
    converter
    Opis:
    The newest Special Section is intended to focus on recent research and trends in application of multilevel converters. Multilevel converters have been extensively developed over the last two decades and show several important advantages of power electronic circuits, such as: operation at high voltages, harmonics reduction, higher efficiency, modularity, smaller size and lower cost. Also, thanks to increasing interest in renewable energy systems (RES) and SGs, the development of multilevel converters is considerably accelerated. The papers included in the presented special section are grouped into the main categories that follow.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 563-565
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected aspects of Modular Multilevel Converter operation
    Autorzy:
    Zygmanowski, M.
    Grzesik, B.
    Fulczyk, M.
    Nalepa, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/201376.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    modular multilevel converter
    MMC
    power electronic converter modeling
    Opis:
    The operation of the Modular Multilevel Converter (MMC) is the main subject of this paper. Selected operation aspects are discussed on the basis of the averaged model, with a special focus on power section parameters and control. The direct modulation method has been chosen for the control of the MMC.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 375-385
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A High Gain Single Switch DC-DC Converter with Double Voltage Booster Switched Inductors
    Autorzy:
    Addagatla, Nagaraju
    Boini, Rajender
    Powiązania:
    https://bibliotekanauki.pl/articles/2201925.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    multilevel converter
    boost converter
    DC-DC converter
    high gain converters
    Opis:
    The research for novel power conversion topologies and the development of cutting-edge power component technologies are driven by the demand for renewable and much more efficient electricity generation, delivery, and conversion. Simulation and Analysis High Voltage Gain DC-DC Converter with Double Voltage Booster Switched Inductor for PV Applications are analyzed in this paper. Multilevel boost converter topologies recently reintroduced, are gaining popularity as a solution for industrial and transportation power systems because they enable the use of innovative, efficient, but relatively low voltage low-voltage devices at greater voltage and power levels. there is only one power switch on the converter that is planned here, three diodes, two capacitors, and two inductors to achieve ultra-high gain with better efficiency. High voltage gain, minimal switch stress, and the ability to lessen input-current ripple and capacitor voltage ripple are all benefits of the topology. When it switches complementary, the capacitors' ripple is reduced, which lowers the size requirement for the capacitors. A 12V, 500 watts prototype was analyzed, simulated and designed. at a duty cycle of 0.75 it is achieved high DC-DC gain i.e 19 and efficiency 93%. The practicality of the converter will be demonstrated by the close agreement between the analysis and simulation findings.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 2; 1--11
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural capacitor voltage balance in multilevel flying capacitor converters. A review of research achievements
    Autorzy:
    Stala, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193250.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flying capacitor converter
    natural capacitor voltage balance
    multilevel converter
    inverter
    DC-DC converter
    Opis:
    The flying-capacitor (FC) topology is one of the more well-established ideas of multilevel conversion, typically applied as an inverter. One of the biggest advantages of the FC converter is the ability to naturally balance capacitor voltage. When natural balancing occurs neither measurements, nor additional control is needed to maintain required capacitors voltage sharing. However, in order to achieve natural voltage balancing suitable conditions must be achieved such as the topology, number of levels, modulation strategy as well as impedance of the output circuitry. Nevertheless this method is effectively applied in various classes of the converter such as inverters, multicell DC-DC, switch-mode DC-DC, AC-AC, as well as rectifiers. The next important issue related to the natural balancing proces is its dynamics. Furthermore, in order to reinforce the balancing mechanism an auxiliary resonant balancing circuit is utilized in the converter which can also be critical in the AC-AC converters or switch mode DC-DC converters. This paper also presents an issue of choosing modulation strategy for the FC converter due to the fact that the natural balancing process is well-established for phase shifted PWM whilst other types of modulation can be more favorable for the power quality.
    Źródło:
    Power Electronics and Drives; 2016, 1, 36/2; 5-33
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Review of LCC-HVDC and VSC-HVDC Technologies and Applications
    Autorzy:
    Oni, O. E.
    Mbangula, K. I.
    Davidson, I. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/136148.pdf
    Data publikacji:
    2016
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    commutation failure
    HVDC
    line commutated converter
    modular multilevel converter
    voltage source converter (VSC)
    Opis:
    High Voltage Direct Current (HVDC) systems has been an alternative method of transmitting electric power from one location to another with some inherent advantages over AC transmission systems. The efficiency and rated power carrying capacity of direct current transmission lines highly depends on the converter used in transforming the current from one form to another (AC to DC and vice versa). A well-configured converter reduces harmonics, increases power transfer capabilities, and reliability in that it offers high tolerance to fault along the line. Different HVDC converter topologies have been proposed, built and utilised all over the world. The two dominant types are the line commutated converter LCC and the voltage source converter VSC. This review paper evaluates these two types of converters, their operational characteristics, power rating capability, control capability and losses. The balance of the paper addresses their applications, advantages, limitations and latest developments with these technologies.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2016, 1, 3; 68-76
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model predictive current control method for four-leg three-level converter operating as shunt active power filter and grid connected inverter
    Autorzy:
    Antoniewicz, K.
    Rafal, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200265.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multilevel converter
    model predictive control
    MPC
    power quality
    konwerter
    jakość energii
    Opis:
    This paper presents model predictive control (MPC) with a finite control states set (FS) for three-level four-leg flying capacitor (FCC) converter. Principles of control method are presented and flying capacitor voltages control method is discussed. Experimental results of converter operating as a shunt active power filter (SAPF) and grid connected inverter (GCI) are shown.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 601-607
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multilevel converter in low power drive applications
    Wielopoziomowy przekształtnik do zastosowań w układach napędowych małej mocy
    Autorzy:
    Iwaszkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/159202.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    przekształtnik wielopoziomowy
    urządzenia energoelektroniczne
    falka
    multilevel converter
    electronic power devices
    wavelets
    waveform analysis
    Opis:
    The paper describes a method of generating high quality AC voltage waveforms in low power AC drives. Voltage waveforms are generated by use of multilevel inverters. This technique can be applied particularly in small devices, servomechanisms, robotics. An approach to the synthesis of AC voltage waveforms using analytical methods like Fourier and wavelets transform is presented. The analysis of the obtained waveforms is included to the paper as well as a proposal of adequate converter circuitry.
    W artykule opisano metodę generowania przebiegów napięcia przemiennego wysokiej jakości do układów napędowych małej mocy prądu przemiennego (AC). Przebiegi napięcia są generowane z wykorzystaniem wielopoziomowych falowników. Ta technika może być zastosowana szczególnie w małych urządzeniach, serwomechanizmach i robotyce. Przedstawiono metody syntezy przebiegów napięcia przemiennego z wykorzystaniem metod analitycznych, takich jak przekształcenie Fouriera i przekształcenie Falkowe. W artykule przedstawiono również analizę uzyskanych przebiegów oraz propozycje odpowiednich schematów przekształtników.
    Źródło:
    Prace Instytutu Elektrotechniki; 2009, 240; 195-208
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model predictive control of four-leg three-level flying capacitor converter: influence of model parameter mismatch
    Autorzy:
    Antoniewicz, K.
    Rafał, K.
    Jasiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193479.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    multilevel converter
    current control
    model predictive control
    MPC
    shunt active power filter
    SAPF
    Opis:
    This paper presents a control method for a four-leg three-level flying capacitor converter (FCC) operating as a shunt active power filter (SAPF), based on model predictive control with finite number of control states (FS-MPC). Current control and capacitor voltage balancing are described. Influence of the mismatch of the inductive filter model parameters on the current control precision is analysed. Results are supported by the experimental waveforms obtained with a 10kVA set-up.
    Źródło:
    Power Electronics and Drives; 2018, 3, 38; 1-9
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved carrier phase shift modulation and voltage equalization control strategy in modular multilevel converter
    Autorzy:
    Jin, Hongtao
    Luo, Yinghong
    Fan, Yuheng
    Pan, Shengxiong
    Powiązania:
    https://bibliotekanauki.pl/articles/141004.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    circulation suppression
    modular multilevel converter
    improved carrier phase shifting
    switching frequency
    voltage equalization
    Opis:
    In order to solve the problem of traditional carrier phase-shift modulation with multiple ratios or PI controllers and cumbersome tuning parameters, this paper uses improved carrier phase-shift modulation. The total turn-on number of sub-modules each bridge arm is determined by comparing the sinusoidal modulated wave with the triangular carrier, and then the control signal is generated according to the capacitance voltage sorting result and the bridge arm current polarity. However, this modulation method uses a sorting method that causes the insulated gate bipolar transistor (IGBT) have an excessively high switching frequency. Therefore, a sorting trigger condition that can effectively reduce the switching frequency is used. The method determines whether to reorder based on the error between the voltage average and the actual value. For the circulation problem, the double-frequency negative sequence component is extracted by rotating coordinate transformation, and it is suppressed by PI control. A 21-level MMC model was built in MATLAB/simulink to analyze the sub-module capacitor voltage fluctuation, output current, voltage distortion rate and bridge arm circulation. It is verified that the modulation method can combine the sorting algorithm and circulation suppression method at the same time, and has better voltage equalization and circulation suppression effects.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 4; 803-815
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel converter for voltage balance in series-connected capacitors and batteries
    Autorzy:
    Hachlowski, J.
    Stala, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193493.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    capacitor voltage balance
    multilevel converter
    NPC four-level inverter
    voltage sharing
    supercapacitor
    battery
    Opis:
    This paper presents a novel concept of a circuit for voltage balance of three series-connected capacitors or batteries, as well as the research results. The problem is related to the control of voltage sharing on series capacitors, supercapacitors or battery banks in energy storage systems or direct current (DC)-link of four-level neutral-point-clamped inverters. The proposed circuit is a switched-capacitor (SC) resonant converter composed of a single capacitor and seven transistor switches. Control of the converter makes it possible to transfer energy between any capacitors, by switching selected transistors. This paper presents the basic concept of the converter, an analysis of control strategies and the simulation results for various cases of voltage balancing.
    Źródło:
    Power Electronics and Drives; 2018, 3, 38; 65-74
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiobjective Improved Particle Swarm Optimisation for Transmission Congestion and Voltage Profile Management using Multilevel UPFC
    Autorzy:
    Rao, Mallavolu Malleswara
    Ramadas, Geetha
    Powiązania:
    https://bibliotekanauki.pl/articles/1193696.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    congestion
    unified power flow controller
    improved particle swarm optimization
    modular multilevel converter
    voltage profile
    Opis:
    This paper proposes a multiobjective improved particle swarm optimisation (IPSO) for placing and sizing the series modular multilevel converter-based unified power flow controller (MMC-UPFC) FACTS devices to manage the transmission congestion and voltage profile in deregulated electricity markets. The proposed multiobjective IPSO algorithm is perfect for accomplishing the close ideal distributed generation (DG) sizes while conveying smooth assembly qualities contrasted with another existing algorithm. It tends to be reasoned that voltage profile and genuine power misfortunes have generous upgrades along ideal speculation on DGs in both the test frameworks. The proposed system eliminates the congestion and the power system can be easily used to solve complex and non-linear optimisation problems in a real-time manner.
    Źródło:
    Power Electronics and Drives; 2019, 4, 39; 79-93
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study by modeling and simulation of open-switch fault diagnosis for five-level converters
    Autorzy:
    Becker, F.
    Jamshidpour, E.
    Poure, P.
    Saadate, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/136241.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    open switch fault
    fault diagnosis
    fault detection
    fault localization
    Multilevel converter
    neutral point
    H-bridge
    Opis:
    In this paper, an open-switch fault diagnosis method for five-level H-Bridge Neutral Point Piloted (HB-NPP) or T-type converters is proposed. While fault tolerant operation is based on three steps (fault detection, fault localization and system reconfiguration), a fast fault diagnosis, including both fault detection and localization, is mandatory to make a suitable response to an open-circuit fault in one of the switches of the converter. Furthermore, fault diagnosis is necessary in embedded and safety critical applications, to prevent further damage and perform continuity of service. In this paper, we present an open-switch fault diagnosis method, based on the switches control orders and the observation of the converter output voltage level. In five-level converters such as HB-NPP and T-type topologies, some switches are mostly 'on' at the same time. Therefore, the fault localization is quite complicated. The fault diagnosis method we proposed is capable to detect and localize an open-switch fault in all cases. Computer simulations are carried out by using Matlab Simulink and SimPowerSystem toolbox to validate the proposed approach.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 1; 27-34
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cascaded multilevel converters in recent research and applications
    Autorzy:
    Malinowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/199898.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multilevel converters
    cascaded converters
    modular multilevel converter
    modulation
    solid state transformer
    photovoltaic systems
    konwerter
    przetwornica
    modulacja
    transformator
    systemy fotowoltaiczne
    Opis:
    Multilevel converters have been intensively investigated and developed since 1960s and have found successful industrial applications. The aim of this paper is to present state of the art as well as recent research and applications of cascaded multilevel converters, which are a very interesting solution for power distribution systems and renewable energy sources. Cascaded multilevel converters can easily operate at medium and high voltage based on the series connection of power modules (cells), which use standard low-voltage component configurations. Series connections of modules (cells) allow for high quality output voltages and input currents, reduction of passive components and availability of component redundancy. Due to these features the cascaded multilevel converters have been recognized as attractive solutions for high-voltage direct-current (HVDC) transmission, solid state transformers (SST) and photovoltaic (PV) systems.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 567-578
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extended T-type inverter
    Autorzy:
    Rąbkowski, J.
    Kopacz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193496.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    multilevel inverter
    T-type inverter
    boost converter
    silicon carbide
    Opis:
    This paper presents a new concept for a power electronic converter – the extended T-type (eT) inverter, which is a combination of a three-phase inverter and a three-level direct current (dc)/dc converter. The novel converter shows better performance than a comparable system composed of two converters: a T-type inverter and a boost converter. At first, the three-level dc/dc converter is able to boost the input voltage but also affects the neutral point potential. The operation principles of the eT inverter are explained and a simulation study of the SiC-based 6 kVA system is presented in this paper. Presented results show a serious reduction of the DC-link capacitors and the input inductor. Furthermore, suitable SiC power semiconductor devices are selected and power losses are estimated using Saber software in reference to a comparative T-type inverter. According to the simulations, the 50 kHz/6 kVA inverter feed from the low voltage (250 V) shows <2.5% of power losses in the suggested SiC metal oxide–semiconductor field-effect transistors (MOSFETs) and Schottky diodes. Finally, a 6 kVA laboratory model was designed, built and tested. Conducted measurements show that despite low capacitance (2 × 30 μF/450 V), the neutral point potential is balanced, and the observed efficiency of the inverter is around 96%.
    Źródło:
    Power Electronics and Drives; 2018, 3, 38; 55-64
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A multilevel switched capacitor DC-DC converter. An analysis of resonant operation conditions
    Autorzy:
    Kawa, A. H.
    Stala, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193251.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    multilevel
    DC-DC
    switched capacitor
    resonant
    converter
    boost
    step-up
    Opis:
    This paper presents the research results of a multilevel switched capacitor DC-DC converter (MLSCC). The converter, for power electronic applications, can operate in ZCS mode by utilizing resonant circuits for recharging the switched capacitors. The main focus of this article is an in-depth original analysis of the waveforms and the converter voltage ratio. The concept of the converter is verified by simulation results of the circuit in MATLAB/Simulink Sim Power Systems. The formulas given in the mathematical analysis are evaluated for example parameters of the components with the use of numerical approach in MATLAB software. Plot sets are presented in order to judge the influence of the parameters on converter performance. All non-expected relations are explained based on mathematical analysis. The possibilities of the design optimization are identified and presented based on the anticipated results. The present analysis is important for the converter design process and can be used for numerical multi-object optimization to further improve the converter design.
    Źródło:
    Power Electronics and Drives; 2016, 1, 36/2; 35-53
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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