Network fault tolerant voltage-source-converters for high-voltage applications

Adam, Grain Philip; Finney, S.J.; Williams, B.W.; Trainer, D.R.; Oates, Colin; Critchley, Roger

doi:10.1049/cp.2010.0985

Cited by 64 publications

(56 citation statements)

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“…The voltage at the converter terminal is therefore considered to contain a proportionate amount of negative sequence voltage as in (8).…”

Section: Converter Operation During Grid Voltage Unbalancementioning

confidence: 99%

“…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%

“…The advantages of M2LCs make them very attractive for HVDC and FACTs applications; a number of which are currently in operation and many more are planned [10,11]. In the last decade a number of hybrid modular multilevel voltage source converters [4,[6][7][8]12] have been introduced and extensively investigatedall in the attempt to obtain an optimum modular converter topology and make available the advantages of VSCs for HVDC and FACTS applications.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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.

show abstract

“…The voltage at the converter terminal is therefore considered to contain a proportionate amount of negative sequence voltage as in (8).…”

Section: Converter Operation During Grid Voltage Unbalancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Operation of a hybrid modular multilevel converter during grid voltage unbalance

Amankwah

Watson

Clare

2016

IET Generation, Transmission & Distribution

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“… High-voltage main bridge operates at the fundamental frequency, with no synchronization issues with the H-bridge cascaded cells as in [19].…”

Section: B) DC Faultmentioning

confidence: 99%

New emerging voltage source converter for high‐voltage application: hybrid multilevel converter with dc side H‐bridge chain links

Adam

Williams

2014

IET Generation, Transmission & Distribution

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Abstract-Hybrid multilevel converters are more attractive than the traditional multilevel converters, such as modular converters, because they offer all the features needed in a modern voltage source converter based dc transmission system with reduced size and weight, at a competitive level of semiconductor losses. Therefore, this paper investigates the viability of a hybrid multilevel converter that uses dc side H-bridge chain links, for high-voltage dc and flexible ac transmission systems.Additionally, its operating principle, modulation and capacitor voltage balancing, and control are investigated. This paper focuses on response of this hybrid multilevel converter to ac and dc network faults, with special attention paid to device issues that may arise under extreme network faults. Therefore the hybrid multilevel converter with dc side chain links is simulated as one station of point-to-point dc transmission system that operates in an inversion mode, with all the necessary control systems incorporated. The major results and findings of subjecting this version of the hybrid converter to ac and dc networks faults are presented and discussed.

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%

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

View full text Add to dashboard Cite

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.

show abstract

Network fault tolerant voltage-source-converters for high-voltage applications

Cited by 64 publications

References 0 publications

Operation of a hybrid modular multilevel converter during grid voltage unbalance

Operation of a hybrid modular multilevel converter during grid voltage unbalance

New emerging voltage source converter for high‐voltage application: hybrid multilevel converter with dc side H‐bridge chain links

Control of a hybrid modular multilevel converter during grid voltage unbalance

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