**5. Simulation results**

The derived mathematical models implemented in the Matlab/Simulink environment can be used to generate steady-state and dynamic simulation results. The machine without compensation is used as reference. Capacitance is added to the auxiliary winding and compared with the behaviour of the reference machine. This will show the effect of the capacitors connected to the auxiliary winding on the performance of the modified machine. The dynamic model can be used for steady state analysis by taking readings after the transient.

Modelling and Analysis of Squirrel Cage Induction Motor with Leading Reactive Power Injection 117

Uncompensated 10 microF 20 microF 30 microF

Uncompensated 10 microF 20 microF 30 microF

With the increase in power factor as seen in Figure 6 it is expected that less reactive power will be drawn from the source with the addition of capacitors to the auxiliary winding. Figure 7 supports this expectation. In Figure 7 the reactive power drawn from the source

<sup>0</sup> 0.2 0.4 0.6 0.8 <sup>1</sup> 1.2 1.4 <sup>0</sup>

**Load Torque (pu)**

Because the reactive component of the supply current decreases with the reactive power injection, the magnitude of the supply current therefore decreases. This is shown in Figure 8.

<sup>0</sup> 0.2 0.4 0.6 0.8 <sup>1</sup> 1.2 1.4 <sup>0</sup>

**Load Torque (pu)**

**Figure 7.** Torque – Reactive Power waveform

0.2

0.4

0.6

0.8

**Reactive Power Drawn (pu)**

1

1.2

1.4

reduces with increasing capacitor size.

**Figure 8.** Torque–Current waveform

0.2

0.4

0.6

0.8

**Current (pu)**

1

1.2

1.4
