Three-Phase Three-Level DC/DC Converter for High Input Voltage and High Power Applications-Adopting Symmetrical Duty Cycle Control

Li, Fuxin; Hu, Gaoping; Ruan, Xinbo

doi:10.1109/tpel.2013.2252432

Cited by 40 publications

(15 citation statements)

References 17 publications

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“…But the drawback of these topologies are asymmetrical duty cycle, so the wider soft switching mechanism is not possible [12]- [13]. To simplify further, the modified dc-dc topology [14] is used and it is having the advantages of three-phase three-level features and also effective utilization of transformer and reduced the filter requirement. But this topology is controlled by symmetrical duty cycle and hence there is not a guarantee to operate switches under ZVS.…”

Section: Introductionmentioning

confidence: 99%

Three-Phase Three-Level Soft Switching Dc-Dc Converter for Industrial Applications

Prasad¹,

Obulesh²,

Babu³

2017

IJPEDS

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In high power DC applications, the single-phase DC-DC converter will face large voltage and current stress in each control switch and thereby the power handling capacity is less. To overcome this problem, three-phase DC-DC converter is used and it is suitable for high power applications with reduced number of switches as compared with the conventional topologies. The asymmetrical duty cycle control is considered to operate the switches under soft switching and hence the switching losses are reduced. The transformer leakage inductances are used along with junction capacitances in order to form resonance and hence ZVS commutation is possible in a wider load range. The modified phase shift control method is used for the proposed converter.The operational modes and design equations of the proposed converter have been observed. The simulation is carried out with a load of 1000W for validating the proposed work. Keyword:Full bridge dc-dc converter Pulse width modulation Three-phase three-level (TPTL) Zero current switching (ZCS) Zero voltage switching (ZVS) Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved.Corresponding Author:J. Sivavara Prasad, Lakireddy Bali Reddy College of Engineering, Mylavaram, India. Email: janapatisivavaraprasad@gmail.com INTRODUCTIONThe controlled switches such as IGBTs and MOSFETs are having many advantages in terms of speed of response and system size but these switches are unable to operate at high voltages. The advantages of these smaller size, faster responses, different multi level topologies are been proposed [5]-[11] in order to reduce the voltage across each switching device. The different multi level topologies are flying capacitor, diode clamped and cascaded converters are providing for division of voltage across the switching devices [9]. During the switching instants, the losses in the switching converter will become increased by increasing the switching frequency. The soft switching converters are proposed in order to reduce the switching losses.A Three-Level Full-Bridge Zero-Voltage Zero-Current Switching Converter with a Simplified Switching Scheme [4] is having eight control switches for generating three levels. The size of the filter elements in this paper is high and more number of switches is required for three level operation, hence the cost is high. The Three-Level Combined DC-DC Converter without Added Primary Clamping Devices contains six control switches for three level dc-dc converter operation [1]- [3].The multi level inverter [9] is used to produce the stress across each switch. But this converter is not operating under soft switching scheme. Hence, the switching losses are high and efficiency becomes poor. To overcome all these problems, the proposed five level full bridge zero voltage zero current switching dc-dc converter is suitable.The three level dc-dc topologies are well suited for high input voltage applications where the voltage across power switches are only the half of the input voltage. To reduce the voltage across pow...

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Section: Introductionmentioning

confidence: 99%

Three-Phase Three-Level Soft Switching Dc-Dc Converter for Industrial Applications

Prasad¹,

Obulesh²,

Babu³

2017

IJPEDS

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“…In high power conditions, the voltage of battery cell is 12V or 48V that the power semiconductors and magnetic components face severe current stress. Paralleling of power switches becomes popular solution to increase the current rating; however, it may incur several problems, such as current sharing and complicated control strategy [2]. Therefore, it's necessary and meaningful to research BDC with HVCR in high power ratings application.…”

Section: Introductionmentioning

confidence: 99%

A Novel PWM High Voltage Conversion Ratio Bidirectional Three-Phase DC/DC Converter With Y–Δ Connected Transformer

Jin

Liu

2016

IEEE Trans. Power Electron.

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In order to solve the problem of high voltage conversion ratio between DC bus and energy storage unit, a novel bi-directional three-phase DC/DC converter applicable to high power condition is proposed in this paper. With the new PWM strategy and inherent ability of increasing voltage conversion ratio of Y-Δ connected transformer, the voltage conversion ratio is doubled. With the new PWM strategy, the effective duty cycle range of three-phase DC/DC converter is expanded, which results in halved filter inductance. Three-phase full-bridge structure is connected to the DC bus, while current-tripler unit is connected to the battery. As three-phase interleaved structure is adopted, not only current stress of switches decreases, but also the frequency of input and output current ripple increases to three times of switching frequency, which leads to smaller filters and extended lives cycle of batteries. The operating principle and characteristics of the converter are analyzed in detail. A prototype with the 360V DC bus converted to 48V/42A batteries was built and the results are given based on the experiments. Index Terms-high voltage conversion ratio, three-phase DC/DC converter, bi-directional DC/DC converter, Y-Δ connected transformer, interleaved Ke Jin (S'04-M'09) was born in Nanjing, China, in 1978. He received the B.S., M.S., and Ph.D. degrees in electrical engineering from the Nanjing University of

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“…Hence, the medium-frequency highpower (MFHP) isolated dc/dc converter has been extensively employed in various applications, including the high-voltage dc, distributed generation, high-speed railway, more electric ship, and more electric aircraft [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Effects of Asymmetric Coupling on Winding AC Resistance in Medium-Frequency High-Power Transformer

Wang¹,

Xiao²,

Zhao³

et al. 2014

IEEE Trans. Magn.

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Medium-frequency high-power (MFHP) isolated dc/dc converter has been extensively employed in various applications, including the high-voltage dc, distributed generation, high-speed railway, more electric ship, and more electric aircraft. The MFHP transformer is one of the most important components of the dc/dc converter. In MFHP application, the circulating current often occurs in the parallel secondary windings for transformer with foil-wound winding, together with primary-series secondary-parallel (PSSP) structure. It is because of the existence of asymmetric mutual inductance, described as asymmetric coupling between the primary and the secondary winding, that the absolutely symmetry cannot be achieved. Thus, a knee frequency exists, which in turn leads to significantly increased ac resistance if the working frequency of transformer is set above it. To predict the knee frequency caused by asymmetric coupling in windings, an analytical model together with a scaled-down experimental transformer to obtain the asymmetrical coupling coefficients is developed to predict the knee frequency for real-scaled transformer. The accuracy of developed analytical model is validated by the measured result. Then, a prototype 980 kVA megawatt-level MFHP transformer having PSSP structure is been built based on the analytical and experimental optimized knee frequency.Index Terms-AC resistance, circulating current, knee frequency, medium frequency high power (MFHP) transformer.

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Three-Phase Three-Level DC/DC Converter for High Input Voltage and High Power Applications-Adopting Symmetrical Duty Cycle Control

Cited by 40 publications

References 17 publications

Three-Phase Three-Level Soft Switching Dc-Dc Converter for Industrial Applications

Three-Phase Three-Level Soft Switching Dc-Dc Converter for Industrial Applications

A Novel PWM High Voltage Conversion Ratio Bidirectional Three-Phase DC/DC Converter With Y–Δ Connected Transformer

Effects of Asymmetric Coupling on Winding AC Resistance in Medium-Frequency High-Power Transformer

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