A Single-Stage Buck-Boost Three-Level Neutral-Point-Clamped Inverter with Two Input Sources for the Grid-Tied Photovoltaic Power Generation

Table 1

Possible output switching states under different operation modes of dc/dc voltage boosting part.

Operation modes of dc/dc voltage boosting part	SW= SW’=1	SW= 0, SW’=1	SW= 1, SW’=0
Possible output switching states of NPC inverter	all the switching states shown in Figure 8	1,0,0,1,1,0,0,1,0; 0,1,1,0,0,1,1,0,1	0,-1,-1,0,0,-1,-1,0,-1; -1,0,0,-1,-1,0,0,-1,0