A six-pulse rectifier is shown in Figure 5.8a. Assuming that the load
approximates a current source (with very large load inductance), the line
current drawn from the rectifier shows a THD of 31 percent, and an
absence of a third-harmonic and all triplen harmonics (Figure 5.8b). We
can show that the harmonic amplitudes of the phase currents of the ideal
six-pulse rectifier with current source load, IL, are [5.1]: