Voltage Sharing Control Strategy of Diode Clamped MMC Circuit

doi:10.3969/j.issn.1000－7229.2017.04.011

Abstract

Abstract: To solve the problem that the traditional modular multilevel converter （MMC） voltage balancing system contains more DC voltage sensors and complicated control circuit, this paper applies the diode clamped topology into the MMC, and puts forward the suitable capacitor voltage balance control method for this topology. This topology can provide one-way clamp path for the DC capacitor by installing clamp diodes in each sub module capacitor anode, so as to reduce the sub module capacitor voltage of each bridge arm in MMC from top to bottom in turn, and simplify the system circuit and its control method. Finally, we build the eleven level diode clamped MMC topology simulation model in

MATLAB/SIMULINK. The results show that the topology has the self ordering function and good balance effect of the capacitor voltage.

Key words: diode clamped, modular multilevel converter （MMC）, capacitor voltage balance control, capacitor voltage self ordering

CLC Number:

TM 46

DING Ruoyu, WANG Yi, FU Yuan, LIU Hao, LI Chunlai. Voltage Sharing Control Strategy of Diode Clamped MMC Circuit[J]. Electric Power Construction, 2017, 38(4): 79-.

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