Recently

the researches of wind power generation focus from the land-based wind farm to the offshore wind farm. However

with the wind turbine power increase

offshore wind farm capacity expansion

and the power transmission distance increase

making the original mature technology of the land-based wind farm is difficult to be used directly. Aiming at it

this paper systematically summarizes the typical offshore wind farm modes

and then reviews three kinds of wind turbine in parallel array mode

and introduces two new wind turbine solutions to improve the power density. Large capacity converter is one of the key devices of the offshore wind farm

and it can be divided into the integrated structure and modular structure. From several aspects

such as the reliability

fault tolerance ability and cost

four different topologies of the integrated converter has been comparative studied

and the realization forms of the modular converter which can be split into cascading scheme and parallel scheme also be researched at the same time. At last

several power electronic devices which are suitable for large capacity wind power converters are analyzed. The research conclusions support the large capacity converter design for the offshore wind farm.