Voltages at the terminals of the converters Vo1 and Vo2 are positive as shown
for between 0 and 90 and negative for between 90 and 180. The converter
supplying power will operate with a positive voltage while the converter absorbing
power will have a negative voltage.
With converter 1 in Fig. 4-24a operating as a rectifier and converter 2 operating
as an inverter, the equivalent circuit for power computations is shown in
Fig. 4-24b. The current is assumed to be ripple-free, enabling only the dc component
of the Fourier series to be relevant. The dc current is