The recent inauguration of the London Array, a 640-MW wind farm located 35 km offshore, amply serves to illustrate the emphasis on use of renewable and offshore energy solutions. There is also a growing interest in high-voltage multi-terminal dc system for interconnection of offshore resources. Dc series and series-parallel wind farms have been proposed by researchers to facilitate HVdc connection with the onshore grid, eliminate a mandatory offshore platform for step-up conversion, and save costs compared to ac collection systems. Wind turbines are high power, high voltage power electronics-based electrical conversion systems. A proposed wind turbine design with integrated storage for use in the dc series and series-parallel wind farms in presented. In order to harness the advantages of soft switching, a dual active bridge converter with an embedded high frequency transformer is used as the dc-dc converter. A control system that minimizes the conduction losses in the dc-dc converter is also proposed and presented. Characteristics of the series-parallel connection mandate the need for integrated storage. The key characteristics and design considerations for dc series and series-parallel wind farms are presented.
Himanshu J.Bahirat (S'06) received his BE degree from Visvesvaraya Regional College of Engineering, Nagpur, India in the year 2002 and MSEE in 2009 and PhD in 2013 from Michigan Technological University, MI. He is current a Post-Doctoral Researcher at from Michigan Technological University. He worked in area of circuit breaker design with Schneider Electric Private Limited and Larsen & Toubro Limited at their design centers in India. He is a student member of IEEE and CIGRE.