Reactor(compensation and filtering)

Power distribution networks are increasingly subjected to harmonic pollution from modern power electronic devices, socalled noniinear loads, eg drives, uninter-ruptible power supplies,electornic ballasts. Harmonics are dangerous for capacitors connected in the PFC circuit, especially if the capacitors operate at reasonant frequency. The series connection of reactor and capacitor to detune the series resonant frequency (the capacitor's resonant frequency) helps to prevent capacitor damage. Critical frequencies are the 5^th and 7^th harmonics (250and350Hz). Detuned capacitor banks also decrease the harmonic distortion level and clean the network.