Dynamic Modeling and Analysis of VSC-HVDC Links in Large AC Networks using EUROSTAG Software

The following paper is dedicated to developing and calibrating a dynamic and steady-state VSC - HVDC (Voltage Source Converter - High Voltage Direct Current) model suitable for large AC (Alternating Current) networks by using SmartFlow and EUROSTAG software. In order to simulate the dynamic behavior, a steady-state Test Network with a large number of AC nodes and a VSC-HVDC bipolar link with a total capacity of 2000 MW, is created using SmartFlow software. The dynamic behavior of the VSC-HVDC model is analyzed using EUROSTAG software under different fault types in the network. The dynamic tests evaluate the voltage and frequency stability of the system, as well as the LVRT (Low Voltage Ride Through) capabilities of the VSC-HVDC link against the requirements of international and national legislations such as EU 2016/1447 Commission Regulation code and the National Grid Code of the Romanian TSO (Transmission System Operator) as well as ANRE order 185/2019. Additional simulations are conducted for the active and reactive power response of the VSC-HVDC links to analyze the converter's capability to respond to a change in active or reactive power setpoints. The study results show that the proposed, calibrated VSC-HVDC dynamic model functions properly in a large AC network and meets the technical legislation requirements of the Romanian National Power System. The developed VSC - HVDC model could serve as a starting point for future developments of the dynamic simulation model used by the TSO for a large AC network.