scholarly journals State Space Modeling and Stability Analysis of a VSC-HVDC System for Exchange of Energy

2020 ◽  
Vol 22 (6) ◽  
pp. 413-426
Author(s):  
Asma Rekik ◽  
Ghada Boukettaya
Keyword(s):  
Stability Analysis ◽  
State Space ◽  
Offshore Wind ◽  
Stable Operation ◽  
Transmission Systems ◽  
Hvdc System ◽  
Hvdc Transmission ◽  
Space Modeling ◽  
State Space Modeling ◽  
The Stability

Nowadays, relevant actors are searching for solutions to produce energy with a low impact on the environment. Indeed, transmitting power via large distances with maintaining low losses is one of the main challenges. To improve electricity communication between countries and offshore wind, a new interconnections line must be built. Therefore, Voltage Source Converter High Voltage Direct Current (VSC-HVDC) transmission is incoming as the exceptive technology in order to address the challenges related to the integration of future offshore wind power plants. In spite of its many advantages, VSC-based HVDC transmission systems can experience unexpected instability and interaction phenomena: Small disturbances that occur continually in VSC-HVDC transmission systems due to the complex VSC based interconnections and an important number of components with non-linear nature that may cause failure. Thus, before installing the HVDC system, there is a significant need for studying a hybrid AC-DC system to guarantee the reliable and stable operation. This paper deals with the stability of a VSC-HVDC system by the use of a small signal stability method; such procedure enables to study the stability of a linearized VSC-HVDC system through state-space modeling and eigenvalue-based stability analysis.

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

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8017
Author(s):  
Luís F. N. Lourenço ◽  
Filipe Perez ◽  
Alessio Iovine ◽  
Gilney Damm ◽  
Renato M. Monaro ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Power Systems ◽  
Power System ◽  
Lyapunov Stability Theory ◽  
Test System ◽  
Renewable Energy Resources ◽  
Transmission Systems ◽  
Hvdc Transmission ◽  
The Stability ◽  
Virtual Synchronous Machine

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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