Advanced Hybrid Transient Stability and EMT Simulation for VSC-HVDC Systems

Meer, Arjen A. van der; Gibescu, Madeleine; Meijden, Mart A. M. M. van der; Kling, W.L.; Ferreira, J.A.

doi:10.1109/tpwrd.2014.2384499

Cited by 96 publications

(39 citation statements)

References 18 publications

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“…presented in [18]- [21]. This approximation is based on the reasonable assumption that the converters are tightly-regulated, the harmonic distortion is negligible, dc faults are outside the scope of the analysis, the transient response is typically in the range of few milliseconds, losses can be neglected and a generic model can be used to represent the dynamics.…”

Section: B Conditions For the Use Of An Approximated Model For The MMCmentioning

confidence: 99%

Dynamics and Stability of Meshed Multiterminal HVDC Networks

Sánchez

Garcés

Bergna-Diaz

et al. 2019

IEEE Trans. Power Syst.

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This paper investigates the existence of an equilibrium point in multiterminal HVDC (MT-HVDC) grids, assesses its uniqueness and defines conditions to ensure its stability. An offshore MT-HVDC system including two wind farms is selected as application test case. At first, a generalized dynamic model of the network is proposed, using hypergraph theory. Such model captures the frequency dependence of transmission lines and cables, it is non-linear due to the constant power behavior of the converter terminals using droop regulation, and presents a suitable degree of simplifications of the MMC converters, under given conditions, to allow system level studies over potentially large networks. Based on this model, the existence and uniqueness of the equilibrium point is demonstrated by returning the analysis to a load-flow problem and using the Banach fixed point theorem. Additionally, the stability of the equilibrium is analyzed by obtaining a Lyapunov function by the Krasovskiis theorem. Computational results obtained for the selected 4 terminal MT-HVDC grid corroborate the requirement for the existence and stability of the equilibrium point.Index Terms-Offshore wind energy, Multiterminal HVDC systems, HVDC, transient stability, equilibrium point, dynamic systems.

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Section: B Conditions For the Use Of An Approximated Model For The MMCmentioning

confidence: 99%

Dynamics and Stability of Meshed Multiterminal HVDC Networks

Sánchez

Garcés

Bergna-Diaz

et al. 2019

IEEE Trans. Power Syst.

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“…It must be noted that the choice between Norton and Thévenin is arbitrary, as for each one there is an equivalent model in the other representation. This approach can be already found in [13], while further investigations have been reported in [7], [9], [10]. Nevertheless, the above references report on results with a single boundary bus, and on small test systems.…”

Section: A Short Review Of Boundary Conditionsmentioning

confidence: 99%

“…Still today, PM-EMT hybrid simulations are mainly applied to HVDC systems (e.g. [6], [7]). A comprehensive literature review can be found in [8].…”

Section: Introductionmentioning

confidence: 99%

Co-Simulation of Electromagnetic Transients and Phasor Models: A Relaxation Approach

Plumier

Aristidou

Geuzaine

et al. 2016

IEEE Trans. Power Delivery

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Abstract-Co-simulation opens new opportunities to combine mature ElectroMagnetic Transients (EMT) and Phasor-Mode (PM) solvers, and take advantage of their respective high accuracy and execution speed. In this paper, a relaxation approach is presented, iterating between an EMT and a PM solver. This entails interpolating over time the phasors of the PM simulation, extracting phasors from the time evolutions of the EMT simulation, and representing each sub-system by a proper multiport equivalent when simulating the other sub-system. Various equivalents are reviewed and compared in terms of convergence of the PM-EMT iterations. The paper also considers the update with frequency of the Thévenin impedances involved in the EMT simulation, the possibility to compute the EMT solution only once per time step, and the acceleration of convergence through a prediction over time of the boundary variables. Results are presented on a 74-bus, 23-machine test system, split into one EMT and one PM sub-system with several interface buses.

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“…[4]), and from the more practical transient stability perspective (e.g. [5]) based on extensive numerical simulations. On the other hand, power flow in MT-HVDC grids has been studied for long time (see for example [6]) but the subject is still an active research problem as can be inferred from [7] and [8], to name a few.…”

Section: Introductionmentioning

confidence: 99%

HVDC meshed multi-terminal networks for offshore wind farms: Dynamic model, load flow and equilibrium

Garcés

Sánchez

Bergna-Diaz

et al. 2017

2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL)

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This paper presents sufficient conditions for the existence of an equilibrium point of multi-terminal HVDC (MT-HVDC) network for offshore applications. Newton's method is used both as a computational tool and as the basis for proving the existence and uniqueness of the equilibrium. A simple but generalized dynamic model of the MT-HVDC grid for offshore wind farm applications is presented which is non-linear due to the constant power loads with droop regulation. The classic Kantorovitch theorem is used to define the requirements for the existence of the equilibrium and the super-convergence of Newton's method starting from voltages close to 1pu. Finding this equilibrium is equivalent to the power flow in power systems applications. Computational results corroborate the requirements for equilibrium as well as the convergence of the algorithm in a realistic MT-HVDC grid. Index TermsOffshore wind energy, Multiterminal HVDC systems, HVDC, transient stability, equilibrium point, dynamic systems.

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Advanced Hybrid Transient Stability and EMT Simulation for VSC-HVDC Systems

Cited by 96 publications

References 18 publications

Dynamics and Stability of Meshed Multiterminal HVDC Networks

Dynamics and Stability of Meshed Multiterminal HVDC Networks

Co-Simulation of Electromagnetic Transients and Phasor Models: A Relaxation Approach

HVDC meshed multi-terminal networks for offshore wind farms: Dynamic model, load flow and equilibrium

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