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Power electronic control in electrical systems 213
Fig. 6.36 Quadrants of operation of the three-level single-phase half-bridge NPC VSC.
Fig. 6.37 Three-level single-phase full-bridge NPC VSC.
used to name the level of the topologies but rather the line to the DC bus mid-point
voltage waveform (line-to-neutral).
A three-level single-phase full-bridge VSC is shown in Figure 6.37. Each leg
generates a three-level voltage waveform when it is referred to the mid-point of the
