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This paper presents the control strategy of a dc series offshore wind farm with an onshore modular multilevel converter (MMC). The series connection of the dc wind turbines establishes the HVDC transmission voltage level with neither offshore transformer nor centralized converter station, indicating huge savings on offshore wind farm investment. However, power production unbalance in the wind farm...
This study presents control strategies of offshore wind farms with dc series collector systems and modular multi-level converter based high voltage direct current (MMC-HVDC) transmissions. Series connection of dc wind turbines enables the collector system to establish the HVDC transmission voltage level with neither transformer nor centralized converter platform, indicating huge savings on offshore...
The capacity of Gaoling BTB HVDC project reaches 3000MW, while the North China side of the project is weak in structure. It is a typical case of massive DC power feeding into weak AC systems. The study of its stability control strategies is unique. In this paper, a stable operation limit and security control measures after severe faults in the DC and nearby AC system is developed by comparing the...
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