PROJECT TITLE :

A Novel Hybrid arm Bipolar MMC Topology with DC Fault Ride-through Capability - 2017

ABSTRACT:

This paper proposes a completely unique 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 0.5-bridge submodule (HBSM)-based arms (HBSM-arms) that are connected to the ground pole, and the unipolar-voltage full-bridge submodule (UFBSM)-based mostly arms (UFBSM-arms) which are connected to the positive or negative pole. Throughout a pole-to-ground or pole-to-pole dc fault, the hybrid-arm design offers the proposed UFBSM-primarily based hybrid-arm bipolar MMC (UHA-BMMC) the aptitude to supply additional reactive power to support the ac grid whereas blocking the dc fault current. The topology, operation principle, dc fault mechanisms, and dc fault ride-through theme of the UHAB-MMC are presented during this paper. Compared with alternative doable bipolar MMC topologies, the UHA-BMMC provides sensible dc fault ride-through capability with a small cost of power-electronic devices. The validity and options of the proposed UHA-BMMC are verified by simulation results conducted in PSCAD/EMTDC.