| Abstract |
The multiplication of interfaced generation units connected to the utility grid might form VSC-basedtransmission grids in a near future. To support the utility grid autonomously, the converters mustprovide grid-forming capabilities and be connected in parallel. As the structure of a transmission gridis changing and unknown, these requirements presume a robust local voltage control for each highpowerVSC, to face various network topologies. Indeed, the stability is challenged when voltagecontrolledVSCs are close to each other, namely, when the tie-impedance is low. The presentcontribution describes an impedance-based criterion method as a convenient and effective tool forassessing the stability of the voltage control of converters in a VSC-based transmission grid. Themethod is successfully applied to a typical two-VSC system to anticipate unstable situations. |
