A novel approach to providing on route power supplies to rural and urban communities in close proximity to the extra high voltage DC transmission line

Asplund, Gunnar; Williamson, A.

doi:10.1109/pesafr.2007.4498119

Cited by 17 publications

(8 citation statements)

References 1 publication

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“…Such taps, as discussed in [11][12][13][14], have to be able to withstand the full line voltage but only handle a small fraction of the line current rating. Fig.…”

Section: The Hvdc Tapmentioning

confidence: 99%

Modular multilevel DC/DC converter architectures for HVDC taps

Luth

Merlin

Green

2014

2014 16th European Conference on Power Electronics and Applications

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DC/DC connections between DC voltage levels in High Voltage Direct Current (HVDC) schemes are useful for interconnection between links and as taps to inject/extract relatively small amounts of power. Taps with high voltage transformation ratios (such as 500 kV to 50 kV) are particularly challenging to achieve with reasonable use of semiconductor ratings. Four architectures of DC/DC converter covering both direct connection and transformer-interfaced are analysed and compared in terms of the ratio of their apparent power rating (rated current times rated current summed across all stacks of the cells) to the throughput power. It is found that the direct conversion architectures have reasonable power capacity factor only for low transformation ratios (of 2:1 or less) but the inclusion of a transformer and intermediate square-wave operation allows much wider transformation ratios with a reasonable power capacity factor. For each design the nature of the cell-balancing currents has been determined since this is a major factor in determining the total current flow in each cell stack.

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“…Such taps, as discussed in [11][12][13][14], have to be able to withstand the full line voltage but only handle a small fraction of the line current rating. Fig.…”

Section: The Hvdc Tapmentioning

confidence: 99%

Modular multilevel DC/DC converter architectures for HVDC taps

Luth

Merlin

Green

2014

2014 16th European Conference on Power Electronics and Applications

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“…When the load is low in dry season or the system comes to a stop as planned, the direct current is low so that problems of icing appear on transmission lines. [11] Designing icing lines protection function of DC two ends back to back operation mode in DC control protection system can satisfy the needs of lines protection in the period of low load in dry season.…”

Section: Melting Ice Using Two Ends Back To Back Operation Modementioning

confidence: 99%

Reliability Improvement Strategies for HVDC Transmission System

Hong¹,

Yu²

2013

EPE

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“…The power can be tapped from the HVDC line by using the parallel tapped inverter [3][4][5] or the series tapped inverter [1][2]. The shunt tap has to withstand the full DC voltage.…”

Section: Introductionmentioning

confidence: 99%

A grid-connected HVDC shunt tap based on series-input parallel-output DC-AC multi-module 2-level voltage source converters

Elserougi

Massoud

Abdel‐Khalik

et al. 2015

2015 IEEE 8th GCC Conference &Amp; Exhibition

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Tapping-off a small amount of power from an HVDC transmission line to a three-phase local grid can be achieved by using shunt or series HVDC taps. This paper proposes a new grid-connected HVDC shunt tap. The proposed tap uses series-input, parallel-output multi-module 2-level voltage source converters (VSCs) as an alternative to the conventional single DC-to-AC voltage source converter (VSC) followed by a step down transformer. In the conventional system, semiconductor devices should be connected in series, in order to meet the high-voltage requirements in the HVDC systems. Hence, careful design to ensure dynamic voltage sharing between switches is necessary. The proposed technique is not limited by this constraint, as series connection of semiconductor switches can be avoided by employing a large number of VSC modules. The controller of the proposed system should keep equal DC input voltages, and equal output current sharing. Detailed illustration for the proposed controller is presented in this work. A Simulation study is carried out to show the effectiveness of the proposed architecture and to validate the proposed controller.

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A novel approach to providing on route power supplies to rural and urban communities in close proximity to the extra high voltage DC transmission line

Cited by 17 publications

References 1 publication

Modular multilevel DC/DC converter architectures for HVDC taps

Modular multilevel DC/DC converter architectures for HVDC taps

Reliability Improvement Strategies for HVDC Transmission System

A grid-connected HVDC shunt tap based on series-input parallel-output DC-AC multi-module 2-level voltage source converters

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