The SVPWM component

For a three-phase system, 8 space vectors are available according to the following switching patterns:

Vector 1..6 form a hexagon, vector 0 and 7 are of length 0.

First, the space vector is limited, and the sector of the hexagon is determined where the input space vector u is located; then the angle of the space vector within this sector $0\le \mathrm{\phi }<60°$ is calculated.

The input space vector is averaged by $u\&equals;t_a{u}_a\&plus;t_b{u}_b\&plus;t_{0}0$, where $u_a$ is the space vector at the left border of the sector and $u_b$ is the space vector at the right border of the sector. If necessary, a zero length vector is applied additionally.

The relative time spans for averaging over one switching period are determined by the following equations:

To obtain the positive fire signal, the switching time spans are distributed symmetrically: $\frac{t_0}{4}\&plus;\frac{t_a}{2}\&plus;\frac{t_b}{2}\&plus;\frac{t_0}{2}\&plus;\frac{t_b}{2}\&plus;\frac{t_a}{2}\&plus;\frac{t_0}{4}$

The switching pattern of the negative fire signal is just the inverse of the positive fire signal.

The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.