Impact of RES Penetration on the Frequency Dynamics of the 500 kV Vietnamese Power System

The increase of renewable energy sources (RES) typically operating as converter-interfaced generation (CIG) is progressively causing a significant change of power systems operation paradigm. The reduction of the overall available kinetic energy and the consequent impact on the dynamic response of the system is a relevant issue currently under investigation in academic and industrial scopes. The work analyzes the impact of different CIG penetration in the three areas of the 500 kV Vietnamese power system, North, Center and South. The system is modified substituting conventional synchronous generation with converter-interfaced generation. The models of power converters and corresponding controls follow typical representation for stability studies, they are modeled as controlled current sources with active and reactive power loops, and they are implemented as user-written equations components within the overall mathematical model of the system. The dynamic response of the system is then analyzed with extensive dynamic simulations.