Improved power loss balance control for modular multilevel converters based on variable capacitor voltage deviation predefined value under SM malfunction

• DOI: 10.1016/j.ijepes.2023.109729
• Publication Date: 2023-12-22T10:46:55Z
• Authors: Jifeng Zhao; Chaoyue Gu; Sitong Wu; Wenfeng Liu; Yang Lei; Jun Hang; Shichuan Ding
• Keywords: Modular multilevel converter (MMC); TK1001-1841; Power loss balance; Production of electric energy or power. Powerplants. Central stations; Capacitor voltage deviation predefined value; Submodule malfunction

When it concerns the reliable working of modular multilevel converter (MMC), power loss balance control cannot be ignored. Under submodule (SM) malfunction condition, each arm MMC operates in an asymmetrical status, resulting unbalanced every MMCs, which affects operation's reliability. This essay proposes a variable capacitor voltage deviation predefined value-based (VCVDPV-PLBC), could optimize faulty arms' losses by regulating value to change devices' switching MMCs under SM malfunction. On this basis, coupling relationship between SM's frequency and is revealed. The raised VCVDPV-PLBC effectually prolong service life devices arms strengthen reliability system SM. validity was proved simulation results with specialized software PSCAD/EMTDC experimental studies small-scale setup.