Mutators met gemeenskaplike resonansiegapser en reaktiewe belasting as vervormingskompensator

M.Ing.A non-linear load that draws distorted currents from the supply cannot be compensated with classic compensation methods, but has to be compensated by a fast power electronic source of reactive power. Power electronic switches are subjected to electrical extremes when switched from a stiff DC supply. The input voltage to a voltage fed converter can be cyclically reduced to zero by the placing of a relatively small inductor and capacitor in the input of the converter. The switching elements in the converter may change state during these zero voltage instants without incurring switching losses. A voltage fed converter with high frequency resonant link snubber and reactive loading as power filter will be discussed in this thesis. A charged capacitor forms the fast source of reactive power. The resonant link is optimized for the application. Gate turn-off thyristors are used as the switching elements and are characterized according to their turn-off losses under resonant link operation. The gate drive, control and protection circuitry for the system are discussed. A single and three phase resonant link power filter with split supplies are discussed