Temat: Multilevel converter

Skocz do pozycji: 1.

Tytuł:: Multilevel Converters
Autorzy:: Bauer, P.
Kazmierkowski, M. P.
Strzelecki, R.
Tematy:: przetwornik
przetwornik wielopoziomowy
multilevel converter
converter; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200223.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Selected aspects of Modular Multilevel Converter operation
Autorzy:: Zygmanowski, M.
Grzesik, B.
Fulczyk, M.
Nalepa, R.
Tematy:: modular multilevel converter
MMC
power electronic converter modeling; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201376.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A High Gain Single Switch DC-DC Converter with Double Voltage Booster Switched Inductors
Autorzy:: Addagatla, Nagaraju
Boini, Rajender
Tematy:: multilevel converter
boost converter
DC-DC converter
high gain converters; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2201925.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Natural capacitor voltage balance in multilevel flying capacitor converters. A review of research achievements
Autorzy:: Stala, R.
Tematy:: flying capacitor converter
natural capacitor voltage balance
multilevel converter
inverter
DC-DC converter; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1193250.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A Review of LCC-HVDC and VSC-HVDC Technologies and Applications
Autorzy:: Oni, O. E.
Mbangula, K. I.
Davidson, I. E.
Tematy:: commutation failure
HVDC
line commutated converter
modular multilevel converter
voltage source converter (VSC); Pokaż więcej
Wydawca:: EEEIC International Barbara Leonowicz Szabłowska
Powiązania:: https://bibliotekanauki.pl/articles/136148.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

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.
Tematy:: multilevel converter
model predictive control
MPC
power quality
konwerter
jakość energii; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200265.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Multilevel converter in low power drive applications
Wielopoziomowy przekształtnik do zastosowań w układach napędowych małej mocy
Autorzy:: Iwaszkiewicz, J.
Tematy:: przekształtnik wielopoziomowy
urządzenia energoelektroniczne
falka
multilevel converter
electronic power devices
wavelets
waveform analysis; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Powiązania:: https://bibliotekanauki.pl/articles/159202.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Model predictive control of four-leg three-level flying capacitor converter: influence of model parameter mismatch
Autorzy:: Antoniewicz, K.
Rafał, K.
Jasiński, M.
Tematy:: multilevel converter
current control
model predictive control
MPC
shunt active power filter
SAPF; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1193479.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Improved carrier phase shift modulation and voltage equalization control strategy in modular multilevel converter
Autorzy:: Jin, Hongtao
Luo, Yinghong
Fan, Yuheng
Pan, Shengxiong
Tematy:: circulation suppression
modular multilevel converter
improved carrier phase shifting
switching frequency
voltage equalization; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/141004.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A novel converter for voltage balance in series-connected capacitors and batteries
Autorzy:: Hachlowski, J.
Stala, R.
Tematy:: capacitor voltage balance
multilevel converter
NPC four-level inverter
voltage sharing
supercapacitor
battery; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1193493.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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