The Impact of Integration of the VSC-HVDC Connected Offshore Wind Farm on Torsional Vibrations of Steam Turbine Generators

For remote offshore wind farms, transmitting power to the main onshore grid via a Voltage Source Converter High Direct Current (VSC-HVDC) system is mainstream of transmission. It not only cost-effective in long-distance transmission, but also can fully meet side requirements such as black start, voltage support, fault ride through and frequency support. However, it still has some problems, possible impact on needing be paid attention to. In this paper, its torsional responses turbine generator units neighboring AC bus studied by using DIgSILENT PowerFactory software. found that effects Sub-Synchronous Torsional Interaction (SSTI) with controls de-rating operations significantly affect damping ratio modes, whereas machine configurations amount farm integrated electrical torque disturbance. The most noteworthy their superimposed each other if these factors act simultaneously, which would lead increased vibrations reduce shaft’ s life. findings will helpful for avoiding accidents caused when going integrate VSC-HVDC connected into grid.