DEVICE FOR GENERATING A SIGNAL CORRESPONDING TO A VARIABLE MAGNITUDE ASSOCIATED WITH THE REACTIVE POWER OF AN ARC FURNACE IN ORDER TO CONTROL A REACTIVE POWER COMPENSATOR

摘要

pA device generates a signal corresponding to a variable magnitude associated with the reactive power of an arc furnace, in order to control a reactive power compensator. It comprises a reactive power or voltage demodulator and a set of filters connected to the output of the demodulator. The set of filters comprises active bandstop filters having a bandwidth of +/-F relative to frequencies of 2fO, 4fO and 6fO and narrowband active bandstop filters having a bandwidth of substantially +/-2 Hz relative to frequencies of fO and 3fO. fO is the supply frequency and F is approximately fO/2. The device further comprises a phase advance corrector circuit operative in the frequency band O-F connected to the output of the set of filters./p[US4633184A]