Electrotechnical Systems

402 Electrotechnical Systems

The block PLL is used for determination of the reference frame angle position;

this block is also used for the generation of phase voltage signals in the point of

connection without distortions. The fth and the seventh harmonics are extracted

in the subsystems 5Harm and 7Harm according to the principle described earlier,

and the direct components are picked out by the low-pass lters with the cutoff

frequency of 1 Hz. The total signal to compensate is formed at the output of the

summer Sum. The signals with the amplitudes equal to 1 that are in-phase with the

corresponding phase voltages are generated by the blocks ...