Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 32, Issue 3, Pages 1404-1413Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2016.2593745
Keywords
Unipolar-voltage full-bridge submodule (UFBSM); UFBSM-based hybrid-arm bipolarmodular multilevel converter (UHA-BMMC); dc fault ride-through scheme
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Funding
- Key Science and Technology Project of China Southern Power Grid [GZHKJ00000101]
- Power Electronics Science and Education Development Program of Delta Environmental & Educational Foundation
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This paper proposes a novel bipolar modular multilevel converter (MMC) topology with dc fault ride-through capability. The proposed bipolar MMC topology is a hybrid of two types of arms: the half-bridge submodule (HBSM)-based arms (HBSM-arms) which are connected to the ground pole, and the unipolar-voltage full-bridge submodule (UFBSM)-based arms (UFBSM-arms) which are connected to the positive or negative pole. During a pole-to-ground or pole-to-pole dc fault, the hybrid-arm design offers the proposed UFBSM-based hybrid-arm bipolar MMC (UHA-BMMC) the capability to provide additional reactive power to support the ac grid while blocking the dc fault current. The topology, operation principle, dc fault mechanisms, and dc fault ride-through scheme of the UHAB-MMC are presented in this paper. Compared with other possible bipolar MMC topologies, the UHA-BMMC provides good dc fault ride-through capability with a small cost of power-electronic devices. The validity and features of the proposed UHA-BMMC are verified by simulation results conducted in PSCAD/EMTDC.
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