An initial topology of multi-terminal HVDC transmission system in Europe: A case study of the North-Sea region

Irnawan, Roni; Silva, Filipe Miguel Faria da; Bak, Claus Leth; Bregnhøj, Tom Chresten

doi:10.1109/energycon.2016.7513880

Cited by 20 publications

(9 citation statements)

References 18 publications

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“…(1) The total impedance of the circuit should be large enough to have negligible power consumption during normal operation. (2) The switching devices are used to adapt the connected impedance during normal or post-fault operation. The connected impedance should be designed appropriately to fulfil the trade-off between avoiding excessive current and achieving fast pole rebalancing speed.…”

Section: Pole Rebalancing Equipment For Normal and Post-fault Opmentioning

confidence: 99%

“…The majority of the VSC HVDC point-to-point links are built with a symmetrical monopolar configuration to reduce the DC stress on the interface transformers. The symmetrical monopolar configuration is likely to be one of options for the future HVDC grids as European TSOs are already planning to connect the existing point-to-point HVDC links to form HVDC grids [2].…”

Section: Introductionmentioning

confidence: 99%

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Pole Voltage Balancing in HVDC Systems: Analysis and Technology Options

Wang

Beerten

Hertem

2019

2019 IEEE Milan PowerTech

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Maintaining balanced voltage during normal operation and rebalancing pole voltages after a pole-to-ground fault are both necessary to prevent high insulation stresses on the DC cable in a HVDC system. The state-of-the-art solution requires two separate devices to deal with normal and post-fault operation separately. This paper proposes pole rebalancing solutions using a single device applicable to both normal and post-fault operations, thus leading to reduced cost and footprint for pole rebalancing. The proposed circuits use fast switches to dynamically adapt the connected impedance in order to fulfil the requirements for rebalancing voltages during both situations. The performance of the proposed circuits are verified in a four-terminal HVDC test network using EMTP simulations.

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Section: Pole Rebalancing Equipment For Normal and Post-fault Opmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pole Voltage Balancing in HVDC Systems: Analysis and Technology Options

Wang

Beerten

Hertem

2019

2019 IEEE Milan PowerTech

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“…In an area where there are already several VSC-HVDC links in operation, it is more likely to develop the DC grids in steps, i.e. by interconnecting some of these existing links or adding a new converter to the existing link [1], [2]. This is mainly because an organic way of developing the DC grids has a lower investment cost as compared to building the multi-terminal HVDC (MTDC) system from scratch [2].…”

Section: Introductionmentioning

confidence: 99%

“…by interconnecting some of these existing links or adding a new converter to the existing link [1], [2]. This is mainly because an organic way of developing the DC grids has a lower investment cost as compared to building the multi-terminal HVDC (MTDC) system from scratch [2]. As an example, in the south-eastern part of the North Sea region, there are 8 VSC links in operation and 3 more are currently being built.…”

Section: Introductionmentioning

confidence: 99%

Enabling the Existing Point-to-Point VSC-HVDC Control for Multi-Terminal Operation

Irnawan

Silva

Bak

et al. 2019

2019 IEEE Power &Amp; Energy Society General Meeting (PESGM)

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Existing point-to-point (PtP) VSC-HVDC link's control is usually not prepared for a multi-terminal HVDC (MTDC) operation, e.g. the DC voltage droop control might not exist in the PtP link or active power control might not exist in the offshore wind farm (OWF) link. Therefore, an existing PtP link's converter control needs to be adjusted when this link is expanded into an MTDC system by interconnecting new converters into the existing system. If only one vendor is involved in the MTDC system, these MTDC specific controls can be applied directly since the vendor has the knowledge of the installed system. However, if several converter vendors are involved, they need to define a common requirement and adjust their converters to fulfil this requirement. Another option is to implement the MTDC specific control as an extension of the existing converter control. The converter control is operated in DC voltage control, which is commonly found in every PtP link, and the extension gives the appropriate DC voltage reference such that the converter operating point lies along a predefined characteristic. Simulation results show that both implementation approaches can be adopted when a PtP link is expanded into an MTDC system, although each of them has different advantages.

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“…With the increasing number of installed HVDC links, there is a drive to create a meshed dc grid in order to increase reliability and reduce cost [1]. The high voltage, high power, dc-dc converter plays a vital role in the development of such a grid [2], [3].…”

Section: Introductionmentioning

confidence: 99%

Simplified Modelling of the F2F MMC-Based High Power DC-DC Converter Including the Effect of Circulating Current Dynamics

Taffese

Tedeschi

2018

2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)

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The Front-to-Front Modular Multilevel Converter (MMC) is one of the topologies being considered for highvoltage, high-power, dc-dc conversion. Hence, there is a need for the development of simplified models for such a converter in order to study how it behaves in a large power system. Direct interconnection of two MMC models is one option but it leads to high number of states. Moreover, symmetry of the converter offers further simplification opportunities. The use of this fact to develop a simplified models was reported in literature. However, the resulting models are only applicable when compensated modulation is used. Furthermore, these models neglect the effect of Circulating Current Suppression Controllers (CCSCs), which makes the models inaccurate in the presence of such controllers. This paper proposes a more general simplification approach that captures the effect of CCSC while minimizing the number of states. The proposed model is validated by using time domain simulations and modal (eigenvalue) analyses.

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An initial topology of multi-terminal HVDC transmission system in Europe: A case study of the North-Sea region

Cited by 20 publications

References 18 publications

Pole Voltage Balancing in HVDC Systems: Analysis and Technology Options

Pole Voltage Balancing in HVDC Systems: Analysis and Technology Options

Enabling the Existing Point-to-Point VSC-HVDC Control for Multi-Terminal Operation

Simplified Modelling of the F2F MMC-Based High Power DC-DC Converter Including the Effect of Circulating Current Dynamics

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