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VOLTAGE ORIENTED CONTROL – SIMULATION

Figure 3.43 : SimulationBalanced 3phase system, noise

Remark and conclusion We saw that the coefficients

and

can be calculated in Simulink according to

.

Nevertheless, this can create a simulation issue at beginning of the simulation. We assume that for a first implementation and a stiff grid, fixed coefficients can be easily used. Another solution could be to start with fixed coefficients then switch to variable values.

To remove the oscillations on theta, we advice to reduce the PLL bandwidth to 5Hz.

3.7.3 Improvements and conclusion

As indicated in some papers (for example, see [30] in the case of amplitude distortion, frequency distortion, phase distortion, harmonics, phase loss, random noise, the conventional PLL

presented here is not enough.

For

example,

they

use

a

controlled

moving

average

algorithm

to

extract

and a phase locker.

Figure 3.44 : PLL proposed by [30]

52

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