Improved Balancing And Sensing of Sub-module Capacitor Voltages In Modular Multi-level Converters

Capacitor voltage balancing is necessary in Modular Multilevel Converters. Voltage controlled oscillator is used for capacitor voltage measurement in reported literature where voltage sensor is required to be calibrated. In the present work, a voltage sensing method that does not need calibration of...

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Bibliographic Details
Published in2018 IEEE Energy Conversion Congress and Exposition (ECCE) pp. 670 - 677
Main Authors Joshi, Shamkant D., Chandorkar, Mukul C., Shukla, Anshuman
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2018
Subjects
Balancing of capacitor voltages in Modular Multilevel Converters
Capacitors
Multilevel converters
Programmable logic arrays
Pulse width modulation
Sensing of capacitor voltages in Modular Multilevel Converters
Sensors
Voltage measurement
Voltage-controlled oscillators
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Summary:Capacitor voltage balancing is necessary in Modular Multilevel Converters. Voltage controlled oscillator is used for capacitor voltage measurement in reported literature where voltage sensor is required to be calibrated. In the present work, a voltage sensing method that does not need calibration of individual voltage sensors is used for capacitor voltage measurement. Open loop phase shifted carrier pulse width modulation (PSCPWM) method is used and sorting algorithm is employed for capacitor voltage balance. A method of sorting capacitor voltages that selects the modules to be inserted directly based on logic equations is used as compared to the conventional methods of arranging them in ascending or descending order. This facilitates use of Field Programmable Gate Array for sorting. Fairly good capacitor voltage balance is obtained.
ISSN:2329-3748
DOI:10.1109/ECCE.2018.8558331