ac Chopper 2.N2 LV 2 Vout2.N2 LV 2 Vout2.2 LV 2 Vout2.1 α2 ac Chopper 2.2 Inductive Controlled Impedance IAB vb α2 ac Chopper 2.1 LF 2 Vin2 CF 2 NT 2 I in2 α2 va ac Chopper 1.1 Iin1 LF 1 vc ICA NT 1 LV 1 Vin1 CF 1 Capacitive Controlled Impedance CV 1 Vout1.1 α1 ac Chopper 1.2 LV 1 CV 1 Vout1.2 α1 ac-Chopper 1.N1 LV 1 CV 1 Vout1.N1 α1 Figure 13. An active Steinmetz compensator. Power Capacitive CCI Inductive CCI 1,800 1,750 Vpeak Mvar 3 2 1,700 1,650 1 0 Converter Input Voltage 1,850 4 Capacitive CCI Inductive CCI 1,600 0 0.2 0.4 α (a) 0.6 0.8 1 1,550 0 0.2 0.4 α (b) 0.6 Figure 14. The (a) reactive powers and (b) input ac choppers' peak voltage are plotted versus duty cycle a 1,2 . 12 I E E E E l e c t r i f i c ati o n M agaz ine / september 2014 0.8 1