Mitigation of Capacitor Banks Switching Transients considering Injected Harmonics

Installing capacitor banks in electric power systems provide well known benefits, including reactive power compensation, voltage support and power factor correction. However, the capacitor banks modify the harmonic voltages and currents in the network and give rise to current and voltage transients. These transients, reach in harmonics, may be harmful for the capacitor and become an increasing concern for both electric utilities and customers since its switching usually occurs quite frequently. In this paper, firstly, transients caused by capacitor bank switching for a specific part of Uraemia (IRAN) Power Network which has recently been installed in 132kV level, especially from the view point of harmonic spectrum and THD (Total Harmonic Distortion) are analyzed and contemplated. After that, the role and effect of some common methods in harmonic spectrum and THD mitigation are contemplated and compared.

Keywords:

Capacitor bank switching , transients , harmonics , THD