With the increase of installed capacity of offshore wind power

adoption of highly reliable bipolar topology mode can reduce the power loss during single pole outage. However

its such characteristics as complex wiring

multiple equipment

and DC bias voltage withstanding of valve side equipment make the construction cost of the offshore converter station much higher. In this paper

a compact layout scheme for the valve side and DC yard of offshore converter stations of flexible DC transformer based on DC GIS equipment is studied and comparison with the full life cycle technology and economy index of a mono-polar topology is made. The research results show that the adoption of DC GIS can significantly optimize the size

weight

and cost of bipolar offshore converter stations

remarkably in-crease the offshore distance of the economic balance point throughout the full life cycle

and expand the application scenarios of bipolar topology in large-scale and far-reaching offshore wind power transmission.