Input filter design of forced commutated cycloconverters

Input filter analysis and the design of forced commutated cycloconverters (FCCs) is presented. The input filter in each input phase is a second-order LC filter. The FCC, as the input filter load, is represented by a multifrequency current generator. For the FCC control the space vector modulation technique is used. The objective of the input filter design is to minimize the filter total kVA rating (T/sub kVA/) for given constraints of the input current and output voltage total harmonic distortion (T/sub HDi/ and T/sub HDv/). The FCC input filter design is performed using three sets of curves: T/sub kVA/, T/sub HDi/, and T/sub HDv/ versus filter capacitor reactance X/sub c/, for particular values of filter inductor reactance X/sub L/. It is shown that the T/sub kVA/ curves, for each particular X/sub L/, have a conditional minimum, obtained either with T/sub HDi/ or with T/sub HDv/ constraint.