Developing inverter output voltage waveforms with help of orthogonal space vectors

The idea and research results of the novel proposal of Hashad et al. (1998) in terms of VSI control are presented in this paper. The power converter consists of a main inverter supplying the load and a filtering auxiliary inverter. The output voltage space vector of the complex inverter is composed of two orthogonal voltage space vectors, or is taken directly from the main inverter. Such a technique permits one to obtain 18 output vectors and has the advantages of: low harmonic content of the output voltage; low number of both inverters´ switchings; and low power of the auxiliary inverter