METHOD FOR OPERATING A WIND POWER GENERATION SYSTEM

摘要

A method for operating a power generation system coupled to a power grid during a grid unbalance event, a method for determining an injection current to be supplied into a power grid by a power generation system, and a method for addressing an asymmetric grid fault in a power grid connected to a power generation system are provided. The methods may be carried out based on a reactive or an active power/current priority. For reactive power/current priority, positive and negative sequence reactive currents are first determined and adjusted. Positive and negative sequence active currents are determined such that a maximum current limit, a maximum allowed active power ripple and a maximum grid side converter voltage are not exceeded. For active power/current priority, positive and negative sequence active currents are first determined. Positive and negative sequence reactive currents are then determined based on the positive and negative sequence active currents. The positive/negative sequence active/reactive currents are determined such that a maximum current limit, a maximum allowed active power ripple and a maximum grid side converter voltage are not exceeded.