Title :
Reduction of DC-link capacitor in case of cascade multilevel converters by means of reactive power control
Author :
Gohil, Ghanshyamsinh ; Huai Wang ; Liserre, Marco ; Kerekes, Tamas ; Teodorescu, Remus ; Blaabjerg, Frede
Author_Institution :
Dept. of Energy Technol., Aalborg Univ., Aalborg, Denmark
Abstract :
A new method to selectively control the amount of dc-link voltage ripple by processing the desired reactive power by a DC/DC converter in an isolated AC/DC or AC/DC/AC system is proposed. The concept can reduce the dc-link capacitors used for balancing the input and output power and thereby limiting the voltage ripple. It allows the use of a smaller dc-link capacitor and hence a longer lifetime and at the same time high power density and low cost can be achieved. The isolated DC/DC converter is controlled to process the desired reactive power in addition to the active power. The control system to achieve this selective degree of compensation is proposed and verified by Simulations.
Keywords :
AC-DC power convertors; DC-AC power convertors; DC-DC power convertors; capacitors; reactive power control; AC-DC system; AC-DC-AC system; DC-DC converter; DC-link capacitor reduction; active power; cascade multilevel converters; dc-link voltage ripple; high power density; reactive power control; voltage ripple; Bridge circuits; Capacitors; Inductors; Reactive power; Switches; Voltage control; Zero voltage switching;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803315
