Abstract
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.
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