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Neutral-point-clamped (NPC) three-level inverters can drive a combination of single- and three-phase loads or non-linear in a three-phase four-wire distribution system. However, an intrinsic problem with NPC three-level inverters is the fluctuation in the neutral-point (NP) voltage. In this study, a dynamic model of the NP voltage in a three-phase four-wire system will be analysed and developed. On...
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