FIVE-LEVEL PV INVERTER BASED ON A MULTI-STATE SWITCHING CELL

摘要

The present invention relates to a five-level active neutral-point- clamping inverter for converting a bipolar DC-voltage (V DC + and V DC -) to a three-phase AC output voltage, the converter comprising first, second and third input terminals (P, MP, N) and first, second and third output terminals (22, 23, 24), where the inverter further comprises a first, second, third multi-state switching cells (MSSC) (12, 12', 12") comprising three input terminals respectively connected to the input terminals of the inverter and respectively a first, second, third output terminal (9, 10, 11). The output terminals (9, 10, 11) of the first, second, third multi-state switching cell is connected via an inductor (La, Lb, Lc ) to said first, second, third output terminal (22, 23, 24) of the inverter and reach respective output terminal (22, 23, 24) of the inverter is connected to said second input terminal (MP) of the inverter via a respective capacitor (Ca, Cb, Cc).