ANALYSIS OF RIPPLE COMPONENTS OF THE INPUT CURRENT AND VOLTAGE OF PWMINVERTERS

Analysis of the ripple components of the input current and voltage of three-phase PWM inverters is presented in this paper. The analytical e xpressions for the input current and voltage ripples of the inverter, as a function of the PWM reference voltage signal, are derived. It is found that the RMS value of the inverter input current ripple does not depend on the shape of the reference voltage signal employed. The inv erter input voltage ripples, under several well-known PWM reference vo ltage signals, are compared. It is found that under the zero load powe r factor, the RMS value of the ripple component of the inverter input voltage does not depend on the shape of the employed reference voltage signal. Experimental results are included to verify the derived expre ssions.