Crowbar protection impact on wind farm behaviour during grid disturbance

Renewable energy sources integration in power systems leaded to the development of new mandatory standards for integrated system operation. During grid faults in power supply network, wind turbines must face major challenge, imposed by strict grid codes, particularly Fault Ride — Through capability. In the event of a grid disturbance, the rotor of the wind turbine generator is susceptible to high currents occurrence, capable to block the rotor side converter and even to damage the entire power electronics. This requires specific measures of control and operation. This paper aims to assess the resistance ratio for the wind turbine converter protection system, namely "crowbar". This aims to limit voltages and to ensure a safe path for currents, bypassing the RSC converter.