| Abstract |
This paper aims at fully digital control of cascaded multilevel converters for custom power application in
a 13.8 kV distribution system. The three-phase STATCOM consists of three chains of cascaded 5
identical single-phase converters. The individual converters are switched at very low frequency, and are
fed from self-powering dc capacitor voltages. A new space vector modulation algorithm is systematically
developed, which decomposes multilevel space vector diagram into simple ones for each of the seriesconnected
cells. Advantages include computationally effective, low injected voltage harmonics, wide
linear modulation range, and fast response to changes in the compensation level. Performance assessment
is presented by simulation and experimental results. |
