Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 35, Issue 3, Pages 2646-2658Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2929689
Keywords
Voltage control; Wind farms; Capacitors; Power conversion; Current control; HVDC transmission; Capacitor voltage balance control; dc link current control; high-voltage direct current (HVdc); modular multilevel converter (MMC); series-connected offshore wind farm
Categories
Funding
- National Key R&D Program of China [2016YFB0901004, 51577101]
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In contrast to the traditional high-voltage direct current (HVdc) based offshore wind farms, series-connected offshore wind farms do not require transformers, voltage source converters (VSCs), and platforms in offshore, thereby significantly decreasing costs. In this study, the onshore converter, which is based on the half-bridge (HB) modular multilevel converter (MMC), and full-bridge (FB) MMC, is proposed to reduce the costs and power loss of the series-connected offshore wind farm. In this type of onshore converter, the dc voltage of the HB-MMC is controlled to be the rated dc voltage, while the dc voltage of FB-MMC can vary from negative rated dc voltage to positive rated dc voltage. With the variable dc voltage of the FB-MMC, the dc-link current of the series-connected offshore wind farm can be controlled at will. Moreover, the dc-link current control strategies are proposed to reduce the power loss of the offshore wind farm. The capacitor voltage balance control, which is suitable for FB-MMC with variable dc voltage, is proposed to ensure the normal operation of the onshore converter. Finally, simulation and experimental results verify the feasibility of the proposed onshore converter and the corresponding control algorithm.
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