Hybrid and Modular Multilevel Converter Designs for Isolated HVDC–DC Converters

Gowaid, I. A.; Adam, Grain Philip; Massoud, Ahmed M.; Ahmed, Shehab; Williams, B.W.

doi:10.1109/jestpe.2017.2744561

Cited by 84 publications

(47 citation statements)

References 30 publications

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“…Diminishing the natural contamination by expanding the productivity and diminishing power losses. Since the quantity of purchasers has been expanded and the quantity of high force ventures is expanded force network has surprisingly confronted higher vitality request [1]. Because of the improving innovation of semiconductor gadgets the Power electronic equipment is supplanting massive transformers.…”

Section: Introductionmentioning

confidence: 99%

Modified U Cell Inverter using Advanced Process Controller for Photovoltaic Applications

Sumathi¹,

Sankari²

2020

IJEAT

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This paper proposes a single phase modified seven level U-Cell inverter configurations in which the advanced process controller has been implemented. By using the boost operation the output of the inverter will produce higher output voltage when compared to the maximum DC source value used. To obtain maximum power the designed inverter is implemented with the photovoltaic system where the power is produced from two different PV panels which is connected to DC link by using DC-DC converters. The semiconductor switches and DC links are used to generate the inverter AC output voltages with seven levels. Two PV panels with different voltages are used in which two panels voltages are combined and their powers are injected to the grid. To validate the dynamic performance of the proposed U-Cell inverter the advanced process controller is used in the inverter connected to the grid. The controller is designed and processed to maintain the capacitor voltage to obtain the desired AC output with desired magnitude. The dynamic performance during changes in the supply current and DC voltage of capacitor for the process controller has been obtained.

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Section: Introductionmentioning

confidence: 99%

Modified U Cell Inverter using Advanced Process Controller for Photovoltaic Applications

Sumathi¹,

Sankari²

2020

IJEAT

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“…DC technology has advantages in transmission capability and footprint over traditional ac [5]- [7], but a difficulty of the dc option that must be overcome in dc networks is the size, cost and power losses incurred in the power converter needed to interface lines of unequal dc voltages. The voltage rating of dc lines are not currently standardized and technology innovation and the quest for high power transfer have led to many different voltages being used [8], [9]. Thus, there will be an essential role for dc-dc conversion equipment with a low step-ratio connected between existing dc links with similar but not identical voltages [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

A Modular Multilevel DC–DC Converter With a Compact Sub-Module Stack Suited to Low Step Ratios

Xiang

Zhang

Chaffey

et al. 2019

IEEE Trans. Power Delivery

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The voltage ratings for dc transmission and distribution are not currently standardized because cable technology is advancing rapidly and therefore low step-ratio dc-dc converter at multi-megawatt scale is a crucial technology for combining point-to-point dc links into multi-terminal networks. This paper presents a modular multilevel dc-dc converter configuration with only a single stack of half-bridge sub-modules (SM) and a resonant tank. The power processed through the stack is a small fraction of the throughput power if the step-ratio is small (− ⁄). Detailed analysis shows the required semiconductor ratings are much smaller compared to the front-to-front MMC and modular converters derived from standard dc-dc topologies. Further, the requirement for SM capacitive energy storage is also significantly less than those converters. The theoretical analysis and the operating principles have been verified by full-scale simulation examples and experiments with a down-scaled prototype. The SMs are operated with an adjustable phase-shift to create a high frequency excitation across the resonant tank for further volume reduction. The SM capacitors self-balance without the need for switching pattern adjustments and the resonant operation provides soft-switching for all power switches to increase efficiency.

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Section: Introductionmentioning

confidence: 99%

“…The converter design is a technical challenge for boosting LV directly to HV due to the conflict between the required high voltage level, e.g., ±800 kV [9] and the restricted voltage ratings of semiconductor components, e.g., 22 kV for SiC thyristors, and 15 kV for SiC transistors [10]. Fortunately, with the development of semiconductors and converter topologies, possible solutions are provided [11][12][13]. To address the challenges, DC converters with high voltage gains [14][15][16][17], modular multilevel converters (MMCs) [18][19][20][21][22] and multi-module converters [23][24][25] are studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Multi-Port High Voltage Gain Modular Power Converter for Offshore Wind Farms

Song

et al. 2018

Sustainability

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In high voltage direct current (HVDC) power transmission of offshore wind power systems, DC/DC converters are applied to transfer power from wind generators to HVDC terminals, and they play a crucial role in providing a high voltage gain, high efficiency, and high fault tolerance. This paper introduces an innovative multi-port DC/DC converter with multiple modules connected in a scalable matrix configuration, presenting an ultra-high voltage step-up ratio and low voltage/current rating of components simultaneously. Additionally, thanks to the adoption of active clamping current-fed push-pull (CFPP) converters as sub-modules (SMs), soft-switching is obtained for all power switches, and the currents of series-connected CFPP converters are auto-balanced, which significantly reduce switching losses and control complexity. Furthermore, owing to the expandable matrix structure, the output voltage and power of a modular converter can be controlled by those of a single SM, or by adjusting the column and row numbers of the matrix. High control flexibility improves fault tolerance. Moreover, due to the flexible control, the proposed converter can transfer power directly from multiple ports to HVDC terminals without bus cable. In this paper, the design of the proposed converter is introduced, and its functions are illustrated by simulation results.

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Hybrid and Modular Multilevel Converter Designs for Isolated HVDC–DC Converters

Abstract: His research interests include mechatronics, solid-state power conversion, electric machines, and drives.

Cited by 84 publications

References 30 publications

Modified U Cell Inverter using Advanced Process Controller for Photovoltaic Applications

Modified U Cell Inverter using Advanced Process Controller for Photovoltaic Applications

A Modular Multilevel DC–DC Converter With a Compact Sub-Module Stack Suited to Low Step Ratios

Multi-Port High Voltage Gain Modular Power Converter for Offshore Wind Farms

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