Predictive Control of Power Converters and Electrical Drives

4.4 Converter Model

The power circuit of the three-phase inverter converts electrical power from DC to AC form using the electrical scheme shown in Figure 4.2. Considering that the two switches in each inverter phase operate in a complementary mode in order to avoid short-circuiting the DC source, the switching state of the power switches S_x, with x = 1, … , 6, can be represented by the switching signals S_a, S_b, and S_c defined as follows:

4.2

4.3

4.4

Figure 4.2 Voltage source inverter power circuit

These switching signals define the value of the output voltages

4.5

4.6

4.7

where V_dc is the DC source voltage.

Considering the unitary vector , which represents the 120° phase displacement ...