Reduction of capacitor ripple voltage and current in Modular Multilevel Converter based variable speed drives

The major drawback of Modular Multilevel Converter (MMC) based variable speed drives is that the capacitor voltage ripple varies inversely with the output frequency. This voltage ripple can be reduced at lower operating frequency by injecting circulating current into its each arm. However, this circ...

Full description

Saved in:
Bibliographic Details
Published in2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia) pp. 1451 - 1456
Main Authors Sau, Shambhu, Karmakar, Saikat, Fernandes, B. G.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2017
Subjects
Bridge circuits
Capacitors
Inductance
Medium voltage drives
Modular multilevel converter
Modulation
Multipulse rectifier
Torque
Variable speed drives
Voltage control
Online AccessGet full text

Cover

More Information
Summary:The major drawback of Modular Multilevel Converter (MMC) based variable speed drives is that the capacitor voltage ripple varies inversely with the output frequency. This voltage ripple can be reduced at lower operating frequency by injecting circulating current into its each arm. However, this circulating current increases the overall current rating of the converter. The voltage ripple can also be reduced by reducing the dc bus voltage when the drive is required to be operated at lower speeds. In this paper, a new configuration using multipulse diode bridge rectifier is proposed to reduce the dc bus voltage when the drive is operated at lower speeds. Therefore, the capacitor ripple voltage is reduced without injecting any circulating current. The proposed configuration is simulated in MATLAB/Simulink and the simulation results are presented to validate the proposed configuration.
DOI:10.1109/IFEEC.2017.7992258