scholarly journals Modelling and Analysis of Bidirectional DC-DC Converter

2015 ◽  
Vol 3 (12) ◽  
pp. 16-30
Author(s):  
Tuğçe Demirdelen ◽  
R. İlker Kayaalp ◽  
Mehmet Tümay
Keyword(s):  
Phase Shift ◽  
Electric Vehicles ◽  
Single Phase ◽  
Control Method ◽  
Power Supplies ◽  
Energy Sources ◽  
Extended Phase ◽  
Converter Topology ◽  
Fortran Programming Language

Bidirectional dc-dc converters are used lots of industrial areas such as electric vehicles, uninterruptable power supplies, fuel cells, solar panel cells as energy sources are searched in order to improve the quality of power at the transmission, distribution lines and other areas. The main contribution of this paper, applying the most common used control method on single phase isolated bidirectional full bridge dc-dc converter and comparing this control method (Extended Phase Shift – EPS) on efficiency way by with/without using snubber capacitors. In this paper, Isolated Bidirectional DC-DC Converter topology is modelled and controller algorithm is written by FORTRAN programming language. According to the results, it is observed that efficiency result of the converter, using snubber capacitors in the converter topology has higher performance than the snubberless system.

Transformer Isolated SCALDO Based High Current DC Power Supply

2018 ◽  
Vol 884 ◽  
pp. 122-128
Author(s):  
Thilanga Ariyarathna ◽  
Nihal Kularatna ◽  
D. Alistair Steyn-Ross
Keyword(s):  
Reducing Power ◽  
Power Market ◽  
Power Converter ◽  
Drop Out ◽  
Power Supplies ◽  
Dc Power ◽  
Converter Topology ◽  
Data Centres ◽  
Global Data

With increasing component count inside the microprocessor, computer has become a power hungry device and powering IT equipment is one of the largest operating expenses and challenge for data centre in USA. According to the data published by Electric Power Research Institute (EPRI), USA global data centres cloud power market is expanding at over 10 percent annually to reach 200 billion kilowatt-hour energy consumption by 2020. Reducing power loss by 1% inside a server power supplies could result in 2 billion kilowatt-hour energy saving.SCALDO is a patented technique developed by the power electronics research group, University of Waikato which improves the efficiency of low drop-out regulators. This technique can be used inside silver box power supplies to enhance the quality of the output power. Practically realising some SCALDO configuration is challenging due to its large switch count. Novel power converter topology presents in this paper helps SCALDO to be used efficiently inside silver box power supplies with electrical isolation and reduced number of switches.

scholarly journals Suppression of Supply Current Harmonics of 18-Pulse Diode Rectifier by Series Active Power Filter with LC Coupling

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 6060
Author(s):  
Wojciech Sleszynski ◽  
Artur Cichowski ◽  
Piotr Mysiak
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Supply Voltage ◽  
Harmonic Distortion ◽  
Control Object ◽  
Experimental Tests ◽  
Active Filter ◽  
Current Control ◽  
Additional Line

The reported research aims at improving the quality of three-phase rectifier supply currents. An effective method consists of adding properly formed booster voltages to the fundamental supply voltages using a series active filter. In the proposed solution, the booster voltages are generated by three single-phase systems consisting of inverters, LC filters, and single-phase transformers. The application of LC couplings ensures low emission of disturbances, but may provoke compensator stability problems. The article presents the current control system for a series active filter designed to suppress the dominant harmonics in the supply currents of an 18-pulse rectifier, without interference into fundamental current components. A proportional control is proposed in combination with integral terms implemented in the orthogonal coordinate systems, which synchronically rotate with frequencies equal to those of the harmonic components to be eliminated. The use of complex gains in integral terms allows a simple phase correction of the output signals. A description is given of the method to determine controller parameters based on the mathematical model of the control object. Sample results of experimental tests performed in steady-state and transient conditions are included to illustrate the quality of performance of the series active filter as compared to the results recorded for the rectifier alone, and for the rectifier with additional line reactor. The applied control method of active filter significantly reduces harmonic distortion of the grid current, which is particularly advantageous at nonideal supply voltage and low loads.

scholarly journals Performance Comparison of Ferrite and Nanocrystalline Cores for Medium-Frequency Transformer of Dual Active Bridge DC-DC Converter

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2407
Author(s):  
Sakda Somkun ◽  
Toshiro Sato ◽  
Viboon Chunkag ◽  
Akekachai Pannawan ◽  
Pornnipa Nunocha ◽  
...  
Keyword(s):  
Phase Shift ◽  
Power Density ◽  
Single Phase ◽  
Performance Comparison ◽  
Experimental Results ◽  
High Permeability ◽  
Medium Frequency ◽  
Extended Phase ◽  
Mnzn Ferrite ◽  
Dual Active Bridge

This article reports an investigation into ferrite and nanocrystalline materials for the medium-frequency transformer of a dual active bridge DC-DC converter, which plays a key role in the converter’s efficiency and power density. E65 MnZn ferrite cores and toroidal and cut nanocrystalline cores are selected for the construction of 20-kHz transformers. Transformer performance is evaluated with a 1.1-kW (42–54 V)/400 V dual active bridge DC-DC converter with single-phase shift and extended phase shift modulations. The experimental results indicate that the toroidal nanocrystalline transformer had the best performance with an efficiency range of 98.5–99.2% and power density of 12 W/cm3, whereas the cut-core nanocrystalline transformer had an efficiency range of 98.4–99.1% with a power density of 9 W/cm3, and the ferrite transformer had an efficiency range of 97.6–98.8% with a power density of 6 W/cm3. A small mismatch in the circuit parameters is found to cause saturation in the nanocrystalline toroidal core, due to its high permeability. The analytical and experimental results suggest that cut nanocrystalline cores are suitable for the dual active bridge DC-DC converter transformers with switching frequencies up to 100 kHz.

An Analysis of On-Bord High-Voltage Converters of Single-Phase Alternating Current with Increased Miroelectric Power Factor

2020 ◽  
Vol 10 (10) ◽  
pp. 44-51
Author(s):  
Yury Yu. SKOROKHOD ◽  
◽  
Sehgey I. VOL’SKIY ◽  
Keyword(s):  
High Voltage ◽  
Single Phase ◽  
Input Current ◽  
Voltage Converter ◽  
Input Unit ◽  
Power Circuit ◽  
Electrical Systems ◽  
Static Converters ◽  
Technical Requirements

The power circuit arrangements of on-board high-voltage static converters fed from a 3000 V AC single-phase network that in the general case produce multi-channel AC and DC output voltages are considered. The basic technical requirements posed to such converters are formulated. The general structural diagram of high-voltage converters with improved electric power consumption quality is given. Possible power circuit arrangements for the high-voltage converter input unit based on single-phase input current correction devices are considered. A classification and criteria for comparative evaluation of the possible power circuit arrangements of these devices are proposed. The information presented in the article will be of interest for specialists engaged in designing on-board electrical systems involving high-voltage converters that must comply with strict requirements for the quality of consumed single-phase input current.

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