Cell capacitor voltage control in a parallel hybrid modular multilevel voltage source converter for HVDC applications

Amankwah, Emmanuel; Clare, John; Wheeler, Patrick; Watson, Alan J.

doi:10.1049/cp.2012.0344

Cited by 17 publications

(15 citation statements)

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“…With regards to, the current through the arms can be described with (11 The net power flow into the CL and the SFB arms with the second harmonic injection can be presented in (12) and (13). If the factor k  of the second harmonic effect is set to be constant and in this case unity as will be discussed later, then K (14) can be selected to ensure zero net power into the converter CL and SFB arms throughout the operating points.…”

Section: Operating Principlementioning

confidence: 99%

“…Among them the Alternate Arm Converter (AAC) [4] which involves the combination of the MMC concept [6] with the 2-level converter concept [12]. If the MMC and the AAC are based on a parallel connection of phases on the DC side, another family of converters can be developed based on a series connection configuration on the DC side [3,13]. The SBC topology [14] is based on the concept originally presented in [3].…”

Section: Introductionmentioning

confidence: 99%

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The series bridge converter (SBC): Design of a compact modular multilevel converter for grid applications

Amankwah¹,

Costabeber²,

Watson³

et al. 2016

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society

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Access from the University of Nottingham repository:http://eprints.nottingham.ac.uk/37544/1/The%20Series%20Bridge%20Converter%20SBC %20Design%20of%20a%20Compact%20Modular%20Multilevel%20Converter%20for %20Grid%20Applications.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the University of Nottingham End User licence and may be reused according to the conditions of the licence. For more details see: http://eprints.nottingham.ac.uk/end_user_agreement.pdf A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract-This paper presents a novel hybrid modular multilevel voltage source converter suitable for grid applications. The proposed converter retains the advantages of other modular multilevel topologies and can be made more compact making it attractive for offshore stations and other footprint critical applications like city infeeds. In this paper, the basic operating principle and design criteria for the converter implementation are presented. The submodule capacitor requirements which have significant influence on the size of a converter station are also evaluated and compared to the MMC.The performance of the converter is supported by simulation results from a representative medium voltage scaled demonstrator.

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Section: Operating Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The series bridge converter (SBC): Design of a compact modular multilevel converter for grid applications

Amankwah¹,

Costabeber²,

Watson³

et al. 2016

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society

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show abstract

“…The model is implemented using PLECS. The power flow control between the power converter and the grid, the power balance between the power converter and the DC circuit and the cell voltage control are achieved with the control schemes discussed in [7,9,10,17]. …”

Section: Modelling and Simulationmentioning

confidence: 99%

“…Research into the performance of the converter in a balanced network is presented in [7,[9][10][11][12][13]. 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).…”

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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“…Research into the performance of the converter in a balanced network is presented in [7,[26][27][28][29][30]. The authors of [31] investigated the operation of the converter with a depressed AC voltage by introducing voltage notches in the AC voltages which has an effect on the DC bus voltage similar to the staggered voltage operation of the converter chainlinks in [5].…”

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.

show abstract

Cell capacitor voltage control in a parallel hybrid modular multilevel voltage source converter for HVDC applications

Cited by 17 publications

References 0 publications

The series bridge converter (SBC): Design of a compact modular multilevel converter for grid applications

The series bridge converter (SBC): Design of a compact modular multilevel converter for grid applications

Control of a hybrid modular multilevel converter during grid voltage unbalance

Operation of a hybrid modular multilevel converter during grid voltage unbalance

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