Figure 10.17 shows waveforms at α = 120°, a region of negative out-
put voltage where operation is possible with an inductive load already
FIGURE 10.13Converter L-N voltages and line currents (inductive load).
FIGURE 10.14Converter bus voltages.
14010◊Phase Control
carrying forward current or with an active load. The voltage is nega-
tive, but the current is still positive, so the power flow is from load to
source. Still further phaseback is possible, but there is a limit. If com-
mutation cannot be completed before ...
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