Adaptive SVM to compensate DC-link voltage ripple for four-switchthree-phase voltage-source inverters

摘要

An adaptive space vector modulation (SVM) approach to compensatenthe DC-link voltage ripple in a B4 inverter is proposed and examined inndetail. The theory, design, and performance of this pulsewidthnmodulation (PWM) method are presented, and the method effectiveness isndemonstrated by extensive simulations and experiments. High-qualitynoutput currents are guaranteed by this approach even with substantialnDC-voltage variations that might be caused by an unbalanced AC supplynsystem, the diode rectification of the line voltages, and circulation ofnone output phase current through the split capacitor bank. Thenapplication of this approach to induction machine drives is alsondiscussed. It is concluded that the DC-voltage ripple effect on the B4ninverter output can be minimized by an adaptive SVM algorithm with thenadvantage of improving the response of the DC-link filter and the outputnquality of the inverter becoming high