Application of Extended P-ROQR Circulation Suppression Strategy in Ship MMC-MVDC Power System
To address the circulating current issues in the modular multilevel converter(MMC)used in medium voltage direct current(MVDC)power systems on ships.The topology and circulating current generation mechanism of the self-blocking MMC are analyzed.A filter based on second-order generalized integrator(SOGI)is used to filter out the DC component in the circulating current.For the AC component in the circulating current,a new circulating current suppressor based on proportional order reduced quasi-resonant(P-ROQR)controller is proposed.A ship-based self-blocking MMC-MVDC power system model is built using MATLAB/Simulink software.Simulation results show that the proposed strategy can effectively suppress the AC component in the circulating current.Moreover,the self-blocking MMC exhibits DC fault blocking capability when applied on the inverter side.The circulating current suppression strategy presented here demonstrates excellent performance in ship-based MMC-MVDC power systems.It also helps reduce bridge arm current distortion and stabilize submodule capacitor voltage.
ship medium voltage direct current(MVDC)power systemmodular multilevel converter(MMC)circulating current suppressionproportional reduced order quasi-resonant
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