Neutral-point-clamped shunt active filter

[摘要] This thesis presents the design and implementation of a Neutral-Point-Clamped(NPC) shunt Active Filter (AF) for non-linear loads. A NPC shunt AF is an attractivesolution for AFs at the medium volage level, because it eliminates the need for coslyinjection transformers. The balance of the capacitors of the direct current (dc) bus ofthe NPC inverter needs to maintained for stable and satisfactory operation though.Modulation techniques and their associated balancing techniques of the NPC inverterare analysed and discussed in the shunt AF setup. Specifically, the effect ofPower Factor (PF), harmonics and unbalance of non-linear loads are considered. Thepractical design and implementation of the NPC shunt AF is presented.Practical and simulation results are presented which validates the presented theory.

[发布机构] Stellenbosch University