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Master of Science Thesis in Electric Power Engineering - page 60 / 114

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VOLTAGE ORIENTED CONTROL – SIMULATION

Simulation2 : Unbalanced 3 phase system Now we create a voltage dip on phase C at 0.025s (30% dip, 70% of the voltage left).

Figure 3.42 : SimulationUnbalanced 3phase system Now an oscillation is produced and we can see a small oscillation on theta_pll too.

Simulation3 : Balanced 3 phase system, noise

We comeback to a balanced grid and we add noise to the 3 phase voltages (random noise for A, square wave for B, sawtooth wave for C, at different frequencies). We can see on the simulation below that the angles are similar (a small error about 0.03deg can be seen with a zoom).

Noise phase A

Noise phase B

Noise phase C

Random wave form

square wave

sawtooth wave

At different frequencies : 100, 150, 200, 250, 1000, 5000, 10000Hz Table 3.6 : Noise parameters

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