High-Gain Resonant Switched-Capacitor Cell-Based DC/DC Converter for Offshore Wind Energy Systems

Parastar, Amir; Seok, Jul-Ki

doi:10.1109/tpel.2014.2314110

Cited by 96 publications

(43 citation statements)

References 20 publications

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“…U out = (n + 1)U in , (9) P = 2CU in (U Cmax ¡ U in )(n + 1) f , (10) where f is the switching frequency equal to 1/T. Maximum power occurs for full recharging of the capacitors:…”

Section: Concept Of Operation and Composition Of The Scvmmentioning

confidence: 99%

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A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies

Stala

Пирог

Penczek

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. This paper presents the concept of topologies and investigation results of switched-capacitor voltage multipliers designed for application in high power systems. The analyzed family of multilevel converters includes established topologies as well as novel concepts. The application of thyristors as well as the invention of novel concepts of multiplier topologies and appropriate control make it possible to achieve high efficiency, high voltage gain, reliable and simple DC-DC converters for high power systems. Based on analytical models of the SCVMs, the paper presents a discussion of the selection of components and the efficiency of the converters as a function of converted power as well as the voltage range on the input and the output side. The results are supported by computer simulations and demonstrative experimental tests. The SC converters operate using the principle of charge pumps and usually contain a large number of switches. However, high efficiency can be achieved in the SC converters by the application of resonant operation [4,15]. The SC converters can also be designed in an efficient way thanks to an appropriate selection of passive and active components [4,16]. The selection of the parameters of the passive components for an SCVM is a complex process and and it should be done considering the switch technology, power and required efficiency, which is demonstrated in [16].The SCVM topology is suitable for the application of thyristors as active switches [3,4,15]. Furthermore, the ability of bidirectional voltage blocking makes it possible to further optimize the SCVMs, as presented in [4,26,27], where the reduction of the number of switches is demonstrated in the topology called RSCVM. The application of thyristors creates possibilities for DC-DC conversion in resonant mode topology at high power, voltages and currents, owing to extremely high parameters of the thyristors. The resonant-mode operation is advantageous, because it makes turning-off the switches possible and assures zero current switching (ZCS) [4]. This paper, in Section 2, presents an analysis of the thyristor-based SCVM related to feasibility of the converter for high power application (Fig. 1a). The analytical results reach 500 kilowatts power, which makes it possible to demonstrate, in figures, the efficiency, range of currents as well as the value of LC parameters. Next, in Section 3, the thyristor-based topologies suitable for high power operation are presented (Figs. 1b, 1c, 1d). The evolution of the SCVM, presented in [4] is also

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“…U out = (n + 1)U in , (9) P = 2CU in (U Cmax ¡ U in )(n + 1) f , (10) where f is the switching frequency equal to 1/T. Maximum power occurs for full recharging of the capacitors:…”

Section: Concept Of Operation and Composition Of The Scvmmentioning

confidence: 99%

“…In the DC-DC conversion area, a number of topologies, concepts and families of the SC converters are proposed in . For many high power applications, in kilowatt range, many new, attractive conversion methods based on SC converters are presented [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. (Fig.…”

Section: Introductionmentioning

confidence: 99%

A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies

Stala

Пирог

Penczek

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…C/DC converter is an important enabling component for developing offshore DC systems, including applications with wind turbine (3-6 MW) [1], [2], subsea compressor (6-80 MW) [3]- [4], and DC transmission grid (>100 MW) [5]- [8] technologies. Cigre uses two DC/DC converters in the DC transmission grid test system [7], and it is considered in several ongoing B4 working groups related to DC grids.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Demonstration of Closed-Loop 30 kW, 200 V/900 V IGBT-Based LCL DC/DC Converter

Fazeli

Jovcic

Hajian

2018

IEEE Trans. Power Delivery

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Abstract--The inductor-capacitor-inductor (LCL) DC/DC converter has been extensively studied for high power and stepping ratio because of elimination of internal transformer, lower footprint/weight, higher efficiency, and most importantly providing DC fault isolation from both DC sides. This paper presents a two-channel, two-layer controller including two inner current loops, which is symmetrical for each bridge of LCL DC/DC. The real-time implementation of control scheme and its performance in normal conditions and during transient DC faults at both sides are studied on a 30kW 200V/900V 1.7 kHz prototype. The prototype development is presented in some depth. The experimental results show that the converter with closed loop control operates well at full power and under fast power reversal. Further DC fault testing concludes that there is no need for blocking since the internal voltage and current variables are within the rated values. Detailed study of converter losses is performed and results show that full power efficiency is around 93.4%.

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“…Although their input and output can share a common ground, these topologies do not provide electrical isolation. Paper [24] presents a resonant switched-capacitor topology with soft switching for various HVDC systems. However, the achievable conversion ratio is generally too low to meet the voltage stepup requirements.…”

Section: Introductionmentioning

confidence: 99%

Design of a Modular, High Step-Up Ratio DC–DC Converter for HVDC Applications Integrating Offshore Wind Power

Zeng

Cao

et al. 2016

IEEE Trans. Ind. Electron.

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Abstract-High power and high voltage gain DC-DC converters are key to high-voltage DC (HVDC) power transmission for offshore wind power. This paper presents an isolated ultra-high step-up DC-DC converter in matrix transformer configuration. A flyback-forward converter is adopted as the power cell and the secondary side matrix connection is introduced to increase the power level and to improve fault tolerance. Because of the modular structure of the converter, the stress on the switching devices is decreased and so is the transformer size. The proposed topology can be operated in column interleaved modes, row interleaved modes and hybrid working modes in order to deal with the varying energy from the wind farm. Furthermore, fault tolerant operation is also realized in several fault scenarios. A 400-W DC-DC converter with four cells is developed and experimentally tested to validate the proposed technique, which can be applied to high-power high-voltage DC power transmission.

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High-Gain Resonant Switched-Capacitor Cell-Based DC/DC Converter for Offshore Wind Energy Systems

Cited by 96 publications

References 20 publications

A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies

A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies

Laboratory Demonstration of Closed-Loop 30 kW, 200 V/900 V IGBT-Based LCL DC/DC Converter

Design of a Modular, High Step-Up Ratio DC–DC Converter for HVDC Applications Integrating Offshore Wind Power

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