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Circulating Current Suppression Control Strategy of MMC Under Static Coordinate
Author(s): 
Pages: 80-84
Year: Issue:  20
Journal: Electrical Measurement & Instrumentation

Keyword:  modular multilevel converterhigh voltage direct currentcirculating current suppressionbalanced con-trol;
Abstract: The double frequency negative circulating current among MMC three phases increase the voltage fluctuation of capacitor,arm current distortion,system losses and electro- magnetic interference,although they do not influence the outer circuit. Combining carrier phase shifted modulation strategy with sorting algorithm,a circulating current sup-pression control strategy is proposed without rotating coordinate transformation by adopting proportion resonance inte-gral controller under αβ coordinate. Finally,a MMC-HVDC simulation system is constructed in MATLAB/Simulink and the simulation results show that the proposed strategy is correctness and validity.
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