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Investigation of Transients in a Common DC Link of Parallel Connected Power Converters

This paper deals with the problem of current oscillations in the common DC link of the power converters operated simultaneously. The parallel operation of the inverters may cause the huge current oscillations between capacitors of the common DC link, add extra losses and decrease lifetime of the capacitors and the fuses. Two methods of the solution to the problem were considered. First is to add extra inductance between DC link capacitor banks, and second is to use PWM timers shift. Experimental results are provided for extra inductance, and simulation experiments were performed to prove the efficiency of the PWM pattern shift.