Assessing the impact of multi-terminal HVDC grids for wind integration on future scenarios of a real-world AC power system using grid code compliant open models

The exploitation of multi-terminal (MT) HVDC (High Voltage Direct Current) grids for offshore wind farm integration into continental bulk AC system raises several technical issues, in particular the verification of the compliance of MTDC grids and offshore wind parks to the performance requirements (in terms of frequency, voltage support and fault ride through) which are being established by the grid codes, and the availability of general and customizable models to simulate their response. The goal of this work is to provide a set of “open” general models, able to fulfill the grid code requirements if suitably tuned, enabling the TSOs to perform their analyses without relying exclusively on vendor-specific models. In order to verify the realistic response of these models, an example of MTDC grid is simulated, connecting it to several plausible operating scenarios of a real world AC system (the West Denmark grid) in target year 2020: after a preliminary N-1 static security assessment study on the integrated AC/DC system, some simulations are performed to check the fulfillment of grid code requirements in case of typical contingencies.