VSC-Based HVDC Power Transmission Systems: An Overview

Flourentzou, Nikolas; Agelidis, Vassilios G.; Demetriades, Georgios D.

doi:10.1109/tpel.2008.2008441

Cited by 1,935 publications

(814 citation statements)

References 109 publications

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“…Modular multilevel voltage source converters (M2LC) are being developed for HVDC and FACTS applications [1][2][3][4][5][6][7][8]. These converters are expected to offer significant benefits over classical HVDC technology utilising Line Commutated Converters (LCCs): -improve the quality of the AC current and voltage waveforms while subjecting the semiconductor devices to low stress [9].…”

Section: Introductionmentioning

confidence: 99%

Operation of a hybrid modular multilevel converter during grid voltage unbalance

Amankwah

Watson

Clare

2016

IET Generation, Transmission & Distribution

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The recently proposed parallel hybrid modular multilevel converter is considered to be a low loss, low component count converter with soft switching capability of the 'main' H-bridge. The converter has similar advantages to other emerging modular multilevel converter circuits being considered for HVDC power transmission and can be made compact which is desirable for offshore application. However, during ac network unbalance the individual 'chain-links' exchange unequal amounts of power with the grid which requires appropriate remedial action. This paper presents research into the performance of the converter and proposes a suitable control method that enables the converter to operate during grid voltage unbalance. The proposed control concept involves the use of asymmetric third harmonic voltage generation in the 'chain-links' of the converter to redistribute the power exchanged between the individual 'chain-links' and the grid. Mathematical analysis and simulation modelling with results are presented to support the work described.

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Section: Introductionmentioning

confidence: 99%

Operation of a hybrid modular multilevel converter during grid voltage unbalance

Amankwah

Watson

Clare

2016

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

show abstract

“…Modular multilevel voltage source converters (M2LC) are being developed for HVDC and FACTS applications [1][2][3][4][5][6][7][8]. These converters are expected to offer significant benefits over classical HVDC technology utilising Line Commutated Converters (LCCs) -lower harmonic content of the synthesised AC waveform, fast and independent control of active and reactive power, reduced filtering requirements, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The converter uses a cascade of half bridge cells to produce a full wave rectified multilevel waveform for each phase according to (1) during balanced network operations according to (2). At the zero crossing of the chainlink voltage, the 'main' H-bridge units are soft switched to "unfold" the chainlink voltage into AC at the network frequency.…”

Section: Introductionmentioning

confidence: 99%

Control of a hybrid modular multilevel converter during grid voltage unbalance

Amankwah

Watson

Wheeler

et al. 2015

11th IET International Conference on AC and DC Power Transmission

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The recently proposed parallel hybrid modular multilevel converter is considered to be a low loss, low component count converter with soft switching capability of the 'main' bridge. The converter has similar advantages to other emerging modular multilevel converter circuits being considered for HVDC power transmission. However, during ac network unbalance the individual 'chain-links' exchange unequal amounts of power with the grid which requires appropriate remedial action. This paper presents research into the performance of the converter and proposes a suitable control method that enables the converter to operate during grid voltage unbalance. The proposed control concept involves the use of asymmetric third harmonic voltage generation in the 'chain-links' of the converter to redistribute the power exchanged between the individual 'chain-links' and the grid. Mathematical analysis and simulation modelling with results are presented to support the work described.

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“…This paper is a postprint of a paper submitted to and accepted for publication in IET Generation, Transmission and Distribution and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library 2 Successive generations of HVDC-VSC schemes have been developed, these include hard switched series strings of IGBTs operated in PWM mode [3] [4]. In addition, modular multilevel converter M 2 C topologies are being commercially developed and finding initial application [5] [6] [7] [8].…”

Section: Introductionmentioning

confidence: 99%