Fault ride through capability of grid forming wind turbines: A comparison of three control schemes

The popularity of converter-based generations, such as wind and solar, suggests that future power systems will be dominated by power-electronic converters, reducing the share of conventional generation, and, inevitably decreasing inertia and short circuit contribution of the system. When this happens in power systems, they become more vulnerable to instabilities. A promising solution for counteracting this vulnerability could be equipping converter-based generation units with grid forming control schemes. A study of the fault-ride through capability of wind turbines with different grid forming control schemes is presented in this paper. In this context, Virtual Synchronous Machines, Power Synchronisation Control, and Distributed PLLs based Control are considered. The performance of these control schemes is evaluated and compared during three-phase symmetrical faults using a case study that consists of a wind turbine connected to an AC grid. The simulated results indicate the strengths and drawbacks of each control scheme during faults.