Network feedback

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Of phase effect is when the operation of an electrical load influence on the stability of the power system is increasing. Such repercussions can occur, for example, in transient processes ( voltage drops caused by switching processes or non-linear loads (especially with components of power electronics such as IGBTs , thyristors )) etc. The latter case leads to harmonics in the currents and voltages.

For example, a four-quadrant controller with an IGBT design , which draws almost sinusoidal current from the network, has significantly less influence on the harmonic spectrum in a power network than a conventional thyristor controller with phase control .

Voltage drops due to the high starting current of electromotive consumers can be countered with soft starters , delayed connection or other measures.

Thus, one or more loads can already be influenced by the circuit design of one or more consumers.

If the measures mentioned are not sufficient, one must try to minimize the network perturbations by installing suitable filters ( suction circuit , low-pass filter ).

literature

  • Wolfgang Kopp: Frequency converter - emission via line . Definition of the term, the problem of frequency converters as a source of interference and measures against it. Grin Verlag, Norderstedt 2007, ISBN 978-3-638-69268-7 .
  • Dieter Anke: Power electronics . Wissenschaftsverlag, Oldenburg 2000, ISBN 3-486-22634-7 .
  • Kurt Feser: Electromagnetic Compatibility . 12th International Trade Fair and Congress for Electromagnetic Compatibility. VDE Verlag, Berlin and Offenbach 2004, ISBN 3-8007-2810-9 .