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The 3L-NPC (three-level neutral-point-clamped) is the most popular multilevel converter used in high-power medium-voltage applications. An important disadvantage of this structure is the unequal distribution of losses among the switches. The performances of 3L-NPC structure were improved by developing the 3L-ANPC (Active-NPC) converter which has more degrees of freedom. In this paper the switching...
The instabilities arising in the power delivery network may cause serious problems for the whole system security. The most difficult detectable event is the energy balance phenomena. This has specific evolution characteristics, which are not so easy to be observed. The paper presents a real type situation, studied on a physically realized model, on a reduced scale. It is based on a permanent magnet...
In this paper a new three-level (3L) voltage source converter is presented. This new topology called Stacked Neutral Point Clamped (3L-SNPC) increases the apparent switching frequency compared with other 3L structures (3L-Stacked Cells, 3L-Neutral Point Clamped and 3L-Active NPC). This advantage leads to a better balancing of total losses in power switches under all specified operating conditions...
This paper analyzes and compares the most common single-stage transformerless photovoltaic inverter topologies for three-phase grid connection with the main focus on the safety issues that result from the lack of galvanic isolation. The change in the leakage current to ground will be investigated and a comparison of the selected topologies will be carried out, based on the component ratings, output...
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