Transient stability of power systems with embedded VSC‐HVDC links: stability margins analysis and control

Gonzalez‐Torres, Juan Carlos; Damm, Gilney; Costan, Valentin; Benchaib, Abdelkrim; Lamnabhi‐Lagarrigue, Françoise

doi:10.1049/iet-gtd.2019.1074

Cited by 20 publications

(13 citation statements)

References 43 publications

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“…Growing levels of converter-interfaced generation, such as HVDC systems and renewables, are connected each year to power systems around the globe. Therefore, the modeling, control, and stability of the power converters are now one of the main focuses of attention for researchers (see [2,3,[34][35][36][37][78][79][80]). Specifically, stability analysis using energy functions were provided in [34,37] for single-machine, single-converter systems and in [2,3] for multi-machine, multi-HVDC systems.…”

Section: Modeling Of a Multi-machine Multi-converter Power Systemmentioning

confidence: 99%

“…The interconnection of these renewable energy sources can be done by high-voltage direct-current (HVDC) power transmission systems, given the big distances involved and the compatibility with the offshore environment challenges [1]. Furthermore, HVDC transmission can be considered as viable reinforcements for the legacy power system as embedded HVDC lines [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Stability Analysis of Grid-Forming MMC-HVDC Transmission Connected to Legacy Power Systems

et al. 2021

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The power system is going through a change in its very foundations. More and more power converters are being integrated into the electric grid to interface renewable energy resources and in high-voltage direct-current (HVDC) transmission systems. This article presents a discussion on the stability of power systems when HVDC transmission systems based on modular multilevel converters (MMC) are connected in grid-forming (GFM) mode to the legacy power system using concepts of energy functions and Lyapunov stability theory and considering aspects of the interoperability between GFM converter technologies. As a base for the stability analysis, we review the main GFM converter technologies (droop and virtual synchronous machine), highlighting their differences. Then, we present a model using the center-of-inertia formulation for a multi-machine/multi-GFM converter power system representing a close future scenario of power systems where GFM converters might adopt different technologies. To illustrate the theoretical Lyapunov-based stability analysis, simulations performed in Matlab/Simulink showed the behavior of a 12-bus test system during a frequency disturbance that originated from the sudden connection of a load. To reflect the interoperability of different GFM technologies and the power system, scenarios with one single GFM technology and a scenario with mixed technologies were investigated. For the test system considered, the frequency response with fewer oscillations and a higher frequency nadir was obtained when all GFM converters were operated as VSMs that have a higher inertial response contribution.

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Section: Modeling Of a Multi-machine Multi-converter Power Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Grid-Forming MMC-HVDC Transmission Connected to Legacy Power Systems

et al. 2021

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“…This study shows that a retuning in the control parameters and a DC-side damper structure are required to assure the grid's stability when the AC and DC grids are interconnected. Reference [14] investigates the effect of the VSC-HVDC links on the transient stability of the AC power systems. A simplified representation of the power system with VSCs modelled as complex current sources with independent active and reactive power injections is used here.…”

Section: Introductionmentioning

confidence: 99%

Stability improvement of MMC‐based hybrid AC/DC grids through the application of a decentralized optimal controller

Elahidoost

Tedeschi

2022

IET Generation Trans & Dist

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Interconnection and expansion of AC networks through high-voltage direct current grids based on modular multilevel converters to form a multiterminal hybrid AC/DC grid can pose stability issues. These challenges can arise from dynamic interactions between/within AC and DC subgrids due to poorly damped modes that are potential sources of persistent and disruptive oscillations. This paper aims to ensure the stability of multiterminal hybrid AC/DC grids via a decentralized optimal controller. The proposed methodology analytically and simultaneously identifies both the decentralized optimal controller and the worstcase perturbation scenario under the grid control inputs' and state variables' constraints, without the need for detailed and time-consuming dynamic simulations of all possible scenarios. Eigenvalue stability analysis and time-domain simulations show that the proposed controller can efficiently enhance the test grid stability margins and reduce the oscillations, not only under the worst-case perturbation scenario (increasing damping ratios of the two pairs of least damped modes by 2.34 and 4.05 times) but also under other critical fault conditions. Furthermore, the controller's superior performance is validated through comparison with the power system stabilizer and modular multilevel converter droop controller under small and large disturbances, and its robustness is assessed against parametric uncertainties.

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“…It has been well understood that the modulation of active and reactive power of VSC-HVDC links can enhance rotor angle stability by counteracting power imbalances, e.g. in [7]- [9]. However, the operational differences between MTDC grids and HVDC links make the application of these concepts on MTDC grids not straightforward.…”

Section: Introductionmentioning

confidence: 99%

A Novel Distributed Supplementary Control of Multi-Terminal VSC-HVDC Grids for Rotor Angle Stability Enhancement of AC/DC Systems

Gonzalez‐Torres

Damm

Costan

et al. 2021

IEEE Trans. Power Syst.

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This paper presents a distributed supplementary control for embedded Multi-Terminal VSC-HVDC (MTDC) grids to enhance the transient stability of the surrounding AC grid. Firstly, the need of supplementary controllers for embedded MTDC grids is demonstrated via the study of the Transient Energy Functions (TEF) of a simple hybrid AC/DC power system. Then, the proposed control structure is presented. This control aims to enhance the angle stability of the surrounding AC system via the modulation of the active power references of the converters. The objective of the control is to enhance AC transient stability while keeping the power balance of the DC grid even if converters reach their active power limits. The proposed control uses frequency and angle measurements at the Point of Common Coupling (PCC) of the converters. The idea behind the proposed strategy is to match the control actions and limits of each pair (i,j) of converters. If converter i modulates its power, converter j modulates the same amount of power in the opposite direction. The concept of virtual links is used in this paper to represent this matching. Finally, the proposed controller is tested on a modified version of the IEEE 39 bus system using EMT simulations.

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Transient stability of power systems with embedded VSC‐HVDC links: stability margins analysis and control

Cited by 20 publications

References 43 publications

Stability Analysis of Grid-Forming MMC-HVDC Transmission Connected to Legacy Power Systems

Stability Analysis of Grid-Forming MMC-HVDC Transmission Connected to Legacy Power Systems

Stability improvement of MMC‐based hybrid AC/DC grids through the application of a decentralized optimal controller

A Novel Distributed Supplementary Control of Multi-Terminal VSC-HVDC Grids for Rotor Angle Stability Enhancement of AC/DC Systems

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