Methodology for droop control dynamic analysis of multiterminal VSC-HVDC grids for offshore wind farms

Prieto‐Araujo, Eduardo; Bianchi, Fernando D.; Junyent-Ferré, Adrià; Gomis‐Bellmunt, Oriol

doi:10.1109/pesgm.2014.6938807

Cited by 74 publications

(129 citation statements)

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“…A linearized small-signal model of the system configuration in per unit (p.u.) is developed for Found in [12], [13], [14], [15], [16], [17], [18], [19] and [20]. Does not include a PI controller.…”

Section: A Reference Test Casementioning

confidence: 99%

Stability of DC voltage droop controllers in VSC HVDC systems

Thams

Suul

D’Arco

et al. 2015

2015 IEEE Eindhoven PowerTech

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Abstract-Future multi-terminal HVDC systems are expected to utilize dc voltage droop controllers and several control implementations have been proposed in literature. This paper first classifies possible dc droop implementations in a simple framework. Then, the small-signal stability of a VSC-based converter station is analyzed for all the identified droop control schemes. The stability range for the system is determined as a function of the droop gain and is used to compare the flexibility and robustness of the implementations. The comparisons reveal that the droop implementations based on the ac current and dc voltage achieve a wider stability region than the other schemes and a limited sensitivity to the droop gain.

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Section: A Reference Test Casementioning

confidence: 99%

Stability of DC voltage droop controllers in VSC HVDC systems

Thams

Suul

D’Arco

et al. 2015

2015 IEEE Eindhoven PowerTech

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“…In the operation of MT-HVDC system, one of the most critical issues is the dependency between voltage control and power balance [23]. The power injections in DC grids are completely regulated by the power converters.…”

Section: Control System For Multi Terminal Hvdc (Mt-hvdc) Systemsmentioning

confidence: 99%

North Sea offshore network and energy storage for large scale integration of renewables

Spro

Torres-Olguin

Korpås

2015

Sustainable Energy Technologies and Assessments

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This review investigates different aspects of the realization of a North Sea offshore grid. The North Sea region has several characteristics that make large-scale integration of renewable energy sources attractive, such as large wind resources and huge hydro reservoirs in the North. A meshed offshore grid with underwater storage can contribute to facilitate sufficient flexibility in the system. The technical review reveals some aspects that need more research, particularly regarding the protection schemes. Furthermore, offshore storage solutions are under development. However, most other aspects are covered by readily available solutions. The greatest challenges seem to lie within standardization, cost-benefit sharing and harmonization of regulatory regimes of the surrounding countries. Nevertheless, several studies have shown highly promising economic benefits of establishing an offshore grid in the North Sea compared to traditional planning of point-to-point connections only.Keywords: offshore grid, HVDC, grid integration, renewable, energy storage, North Sea IntroductionThe integration of renewable power generation implies new challenging issues for the grid such as variability of energy input, frequency response, system power balancing and power market design. Moreover, renewable resources are often located far from the load centers. For future scenarios new transmission infrastructure and energy storage is needed. Consequently, the grid will be more flexible and the security of supply will be ensured. Depending on the grid layout, distance from load centers and geography, few power grids today will support renewable integration above 10%-30% without an elevated risk of outages [1][2][3][4]. To increase the renewable penetration either grid extensions or storage should be added to the system. Optimally, a combination of the two are implemented [4]. The North Sea region could very well be a first mover towards integrated grid and storage planning for high renewable penetration levels. The grid will connect the Northern European mainland, the UK and Scandinavia, with the goals of:• Harvesting offshore wind • Interconnect Europe's energy markets to enhance security, stabilize prices and increase cost efficiency • Provide large scale hydro balancing power to markets with high penetration of variable renewable production • Implement deep-water energy storage to balance fluctuations In addition, the offshore grid can connect to energy consuming facilities in the North Sea, such as oil and gas platform at the Norwegian sector, and thus reduce regional CO 2 emissions further. For reference, the total emission for the power generation of the Norwegian oil and gas sector equaled more than 9 million tons CO2-eqvuivalents for 2010. The power comes mainly from open cycle gas turbines with an average efficiency of approximately 33%, about half of what a modern onshore gas plant can achieve today [5].

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“…The expected advent of multi-terminal systems triggered the development of a new breed of linearised models to study control interactions involving several converters [8]- [13]. In [8], the stability of voltage droop controlled converters in a DC system was discussed using singular value decomposition of a linearised model of the converter controllers and the DC system.…”

Section: Introductionmentioning

confidence: 99%

“…In [8], the stability of voltage droop controlled converters in a DC system was discussed using singular value decomposition of a linearised model of the converter controllers and the DC system. However, the focus was on the voltage droop gain and possible adverse interactions with other control loops were not included.…”

Section: Introductionmentioning

confidence: 99%

Identification and small-signal analysis of interaction modes in VSC MTDC systems

Beerten

D’Arco

Suul

2016

2016 IEEE Power and Energy Society General Meeting (PESGM)

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Abstract-In this paper, a methodology is presented to identify and analyse interaction modes between converters in Voltage Source Converter Multi-Terminal High Voltage Direct Current (VSC MTDC) systems. The absence of a substantial level of energy stored in such power electronics based systems results in fast system dynamics, governed by electromagnetic phenomena. Moreover, interactions between components are largely influenced by the control parameters and in general, an a-priori identification of interaction modes based on associated time constants is less straight-forward than in AC systems. Furthermore, the extent to which converters interact not only depends on the controller parameters, but is also influenced by the physical characteristics of the HVDC system. The methodology introduced in this paper is based on aggregated participation factors to distinguish between local modes, primarily associated with one terminal, and interaction modes involving multiple terminals. To illustrate the proposed methodology, the influence of droop control parameters, as well as DC breaker inductors, on the system dynamics and the participation of the terminals are investigated for a three-terminal MTDC system.

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Methodology for droop control dynamic analysis of multiterminal VSC-HVDC grids for offshore wind farms

Cited by 74 publications

References 0 publications

Stability of DC voltage droop controllers in VSC HVDC systems

Stability of DC voltage droop controllers in VSC HVDC systems

North Sea offshore network and energy storage for large scale integration of renewables

Identification and small-signal analysis of interaction modes in VSC MTDC systems

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