Simplified model of HVDC transmission system connecting offshore wind farm to onshore grid

This paper presents a simplified model of Voltage Source Converter based High Voltage DC (VSC-HVDC) transmission system for dynamic simulation study. Aim of the simplified model is to diminish the complexity and simulation time of the analysis of grid integrated offshore Wind Farm (WF) connected through VSC-HVDC transmission line. This is because simulation analysis of offshore WF based on the detailed VSC-HVDC model needs very large computing time. To evaluate performance of the derived simplified model of VSC-HVDC, simulation analysis is performed on a multi-machine power system model composed of Variable Speed Wind Turbines (VSWTs)-Permanent Magnet Synchronous Generators (PMSGs), VSC-HVDC, and Synchronous Generators (SGs). Comparative analysis between the proposed simplified model and the detailed model of VSC-HVDC is also performed and presented. The simulation results show that the proposed simplified model of VSC-HVDC has sufficient accuracy for analyzing dynamic characteristics.