In case of Permanent magnet synchronous generator operated wind power plant, the converter used in the generator interface converts:

The correct answer is option 1):(one level of AC to another level of AC)

Concept:

• The permamt magnet synchronous generator is mostly used in power plant
• It converts the mechanical power from aerodynamic wind system to electric power
• The wind turbine generator system requires a power conditioning circuit called power converter
• The power converter is capable of adjusting the generator frequency and voltage to the grid. 
• The purpose of power converter is to enable efficient conversion of the variable frequency output of an induction generator, driven by a variable speed wind turbine, to a fixed frequency appropriate for the grid or a load
• In case of Permanent magnet synchronous generator operated wind power plant, the converter used in the generator interface converts one level of AC to another level of AC