Power Flow and Power Reduction Control Using Variable Frequency of Offshore AC Grids

Hu, Xiaobo Sharon; Liang, Jun; Rogers, Daniel; Li, Yalou

doi:10.1109/tpwrs.2013.2257884

Cited by 52 publications

(28 citation statements)

References 15 publications

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“…According to [8], connecting the offshore WPPs to form an offshore grid would probably be the first stage of MTDC grid development. The UK Transmission System Operator, National Grid has proposed three strategies for connecting offshore WPPs, namely, 'radial', 'radial plus', and the 'integrated' strategy as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…There are challenges to form and operate offshore AC grids including the control coordination among multiple converters. Two options have already been proposed in the current literature, namely, master-slave, and droop based control [8]- [10]. However, the study emphasis has been on the DC dynamics (e.g., DC-link voltage and power oscillation) of the system rather than the AC and DC dynamics of the combined power system.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and Dynamic Analysis of a Power System with VSCHVDC Radial Plus Strategy

Shah¹,

Barnes²,

Preece³

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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This work presents the analysis of a radial plus VSC-HVDC scheme in terms of its impact on AC and DC system dynamics. This study uses the classical two-area system with modified demand as an onshore AC grid. Full converter wind power plants (WPPs) are connected to the main grid through two point-to-point VSC-HVDC links, which are connected offshore through an AC cable to form a 'radial plus' strategy for VSC-HVDC connection. A variety of different control schemes for the radial plus VSC-HVDC are described and analysed to find out the impact of these controllers on the dynamic behaviour of the system. Simulation results are presented to illustrate the impact of different control combinations on system dynamic performance under various grid disturbances.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling and Dynamic Analysis of a Power System with VSCHVDC Radial Plus Strategy

Shah¹,

Barnes²,

Preece³

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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“…However, the growing desire to interconnect the various regions within the Europe and North Sea countries may lead to multi-terminal DC (MTDC) grids [2]. Moreover, if built, the often proposed MTDC 'Supergrid' for North Sea countries will be pieced together gradually with the most likely first step being based on integrating offshore WPPs by AC cables to form an offshore AC grid [3]. Such a system can exist without the need for DC circuit breakers or DC protection schemes.…”

Section: Introductionmentioning

confidence: 99%

“…A number of state-ofthe-art control topologies for the offshore VSC-HVDC converter are proposed in [2], [3], [5]- [7] with the majority based on a 'direct voltage' control method of the VSC-HVDC. A droop control method is not considered except in [3], as most of these control topologies are proposed for point-topoint VSC-HVDC configurations. In [3], only the powerfrequency droop method is considered and the performance of the controller under offshore fault conditions is not presented.…”

Section: Introductionmentioning

confidence: 99%

Offshore AC grid management for an AC integrated VSC-HVDC scheme with large WPPs

Shah

Barnes

Preece

2016

2016 IEEE Power and Energy Society General Meeting (PESGM)

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Abstract-Point-to-point VSC-HVDC Wind power plant (WPP) links connected offshore by AC cables can be called an AC integrated VSC-HVDC scheme or virtual multi-terminal DC (MTDC) grid. Since, the AC integrated VSC-HVDC scheme forms an offshore AC grid, parallel operation of offshore VSC-HVDC converters is required. This paper compares three offshore converter control topologies: (i) feedforward control of AC voltage and frequency, (ii) feedback control of AC voltage, and (iii) feedback control of AC voltage and frequency with an inner current loop. The performance of power and current based droops has been assessed for the parallel offshore converters. Simulations carried out in DIgSILENT Power Factory are presented to illustrate the effect of these offshore converter control strategies on the dynamics of the AC system following the offshore grid disturbances.Index Terms-AC integrated scheme, droop control, offshore disturbances, offshore AC grid, wind power plants.

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“…[9] In this case, the converter station can not control the power flow of the DC lines entirely by adjusting the terminal voltage and current, because the current of the line is determined by the resistance of the line to some extent. [10] Thus, power flow control device for DC Grid is necessary, not only to achieve economic operation of the grid, but also to prevent the circuit of overload run in the fault condition.…”

Section: Introductionmentioning

confidence: 99%

Power Flow Controller for The Meshed DC Grids

Gong¹,

Yao²,

Guo³

2015

Proceedings of the 2015 International Conference on Applied Science and Engineering Innovation

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Abstract. With more and more environmental problems, renewable energy begins to play an increasingly large proportion. High-voltage direct current technology based on voltage source converter (VSC-HVDC) enables smooth access to renewable energy. Traditional DC grids system is generally radial connections, but In recent years, there are many parallel lines between the two converter stations in some meshed DC grids. However, the converter stations can't control the power flow of parallel lines completely, and some lines might cause too much loss even overload.According to the theory of circuit,there are four types of power flow control devices, variable resistors, DC transformers, CFC and series voltage sources have been proposed for the power flow control in a meshed DC grid .In this paper, their topology and operation properties were compared.

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Power Flow and Power Reduction Control Using Variable Frequency of Offshore AC Grids

Cited by 52 publications

References 15 publications

Modelling and Dynamic Analysis of a Power System with VSCHVDC Radial Plus Strategy

Modelling and Dynamic Analysis of a Power System with VSCHVDC Radial Plus Strategy

Offshore AC grid management for an AC integrated VSC-HVDC scheme with large WPPs

Power Flow Controller for The Meshed DC Grids

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