Control of storage system in series collection grid in offshore wind farm for limiting DC/DC converter overvoltaging

DC series collection system is a low cost collection grid for integrating offshore wind power to the HVDC grid. The main advantage is to step-up the MVDC voltage level to HVDC level without using extra equipment. However, an effective control system to enable extract and deliver the fluctuation wind power to series collection grid. Previously, a control system has been proposed by authors to this aim, while the propose control system causes overvoltage on DC/DC converter of wind units. In this study a solution is investigated to this limitation. In this paper, utilization of storage system has been considered as a solution for avoiding overvoltage on DC/DC converter. To this aim, the control system is developed for both managing storage system and delivering fluctuating power of wind unit to series collection grid.