The Hybrid-Cascaded DC–DC Converters Suitable for HVdc Applications

Yang, Jie; He, Zhiyuan; Pang, Hui; Tang, Guangfu

doi:10.1109/tpel.2015.2420666

Cited by 123 publications

(47 citation statements)

References 15 publications

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“…The galvanic isolation can also be used to provide firewalling capabilities between two dc networks and isolate dc faults on one network to not affect the other [12]- [15]. Alternatively, using hybrid architectures with modular cells and switches are also proposed for low cost purpose, particularly suitable for interconnecting dc links with small voltage difference [16].…”

Section: Introductionmentioning

confidence: 99%

Large Step Ratio Input-Series–Output-Parallel Chain-Link DC–DC Converter

Zhang

Tian

Xiang

et al. 2019

IEEE Trans. Power Electron.

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High-voltage and high-power dc-dc conversion is key to dc transmission, distribution and generation, which require compact and efficient dc transformers with large step ratios. This paper introduces a dc-dc converter with the input-series-outputparallel (ISOP) arrangement of multiple high step ratio subconverter units. Each sub-converter unit is an isolated modular dc-dc converter with a stack of half-bridge cells chopping the dc down to low voltage level. The transformer provides galvanic isolation and additional step ratio. The converter achieves a large step ratio due to the combination of the series-parallel configuration, the modular cells, and the isolation transformer. The proposed dc-dc converter is analyzed in a 30 kV to 1 kV, 1 MW application to discuss the operation performance, tradeoffs, power efficiency and selection of components. Finally, the converter is validated through a laboratory down-scaled prototype.

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Section: Introductionmentioning

confidence: 99%

Large Step Ratio Input-Series–Output-Parallel Chain-Link DC–DC Converter

Zhang

Tian

Xiang

et al. 2019

IEEE Trans. Power Electron.

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“…Because of this sharing, the current and voltage limits of power devices are no longer obstacles to achieving high-power and low ratio conversion. In comparison with the traditional front-to-front dc/dc converters with modular design [21], [25], this configuration has the operational advantages of inherent SM balancing, compact SM design and soft-switching operation, which are inherited from the single isolated RMMC, but the power device utilizations would suffer drawbacks compared to the MMC-based dc auto-transformer design [29], [31].…”

Section: Variety Of Configurationsmentioning

confidence: 99%

“…However, it is not a low-cost option for MVDC applications since the power devices utilization is usually lower than competing approaches [14], [27], and the complicated rotation algorithm and hard switching operation may further undermine its advantages for MVDC conversion. The concept of the dc auto-transformer with modular multilevel design was proposed in [28]- [31]. Part of sub-modules in the stack were utilized on both high-voltage side and low-voltage side.…”

Section: Introductionmentioning

confidence: 99%

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An Isolated Resonant Mode Modular Converter With Flexible Modulation and Variety of Configurations for MVDC Application

Xiang

Zhang

Chaffey

et al. 2018

IEEE Trans. Power Delivery

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The dc tap or dc transformer will play an important role in interfacing different voltages of dc links in dc grids. This paper presents an isolated resonant mode modular converter (RMMC) with flexible modulation and assorted configurations to satisfy a wide variety of interface requirements for medium voltage dc (MVDC) networks. The transformer-less RMMC, as introduced in the literature, implemented a restricted modulation scheme leading to a very limited range of step-ratio and the diode rectifier resulted in unidirectional power flow. Both of these limitations are removed in this proposal and galvanic isolation has also been added. Moreover, this new RMMC approach can serve as a building block for variety of configurations. Two such derived topologies are given, which inherently balance the voltage and current between different constituent circuits and realize the high power rating conversion for very low or very high step-ratio application. The theoretical analysis is validated by a set of full-scale simulations and a down-scaled experimental prototype. The results illustrate that this isolated RMMC and its derivatives have promising features for dc taps or dc transformers in MVDC applications.

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“…Basically, the most widely adopted solution consists of using DC/AC conversion, with or without transformer, based on twolevel or multilevel VSCs, as shown in Fig. 17 [33,34]. Note that the frequency on the AC side can be much higher than the power frequencies (i.e., 50 or 60 Hz), in order to reduce the transformer size and, hence, that of the DC/DC converter.…”

Section: Cascade Connectionsmentioning

confidence: 99%

Overview of power electronics technology and applications in power generation transmission and distribution

Ortega

Acha

García

et al. 2017

J. Mod. Power Syst. Clean Energy

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The main objective of this paper is three-fold. First, to provide an overview of the current status of the power electronics technology, one of the key actors in the upcoming smart grid paradigm enabling maximum power throughputs and near-instantaneous control of voltages and currents in all links of the power system chain. Second, to provide a bridge between the power systems and the power electronic communities, in terms of their differing appreciation of how these devices perform when connected to the power grid. Third, to discuss on the role that the power electronics technology will play in supporting the aims and objectives of future decarbonized power systems. This paper merges the equipment, control techniques and methods used in flexible alternating current transmission systems (FACTS) and high voltage direct transmission (HVDC) equipment to enable a single, coherent approach to address a specific power system problem, using 'best of breed' solutions bearing in mind technical, economic and environmental issues.

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The Hybrid-Cascaded DC–DC Converters Suitable for HVdc Applications

Cited by 123 publications

References 15 publications

Large Step Ratio Input-Series–Output-Parallel Chain-Link DC–DC Converter

Large Step Ratio Input-Series–Output-Parallel Chain-Link DC–DC Converter

An Isolated Resonant Mode Modular Converter With Flexible Modulation and Variety of Configurations for MVDC Application

Overview of power electronics technology and applications in power generation transmission and distribution

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