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Stability Analysis of Grid-Forming MMC-HVDC Transmission Connected to Legacy Power Systems
| Content Provider | MDPI |
|---|---|
| Author | Lu, ís F. N. Lourenço Perez, Filipe Iovine, Alessio Damm, Gilney Monaro, Renato M. Salles, Maurício B. C. |
| Copyright Year | 2021 |
| Description | 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. |
| Starting Page | 8017 |
| e-ISSN | 19961073 |
| DOI | 10.3390/en14238017 |
| Journal | Energies |
| Issue Number | 23 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-12-01 |
| Access Restriction | Open |
| Subject Keyword | Energies Energy and Fuel Technology Power System Stability Voltage Source Converters Modular Multilevel Converter Grid-forming Converter Future Power System Hvdc Energy Function Stability Analysis |
| Content Type | Text |
| Resource Type | Article |
