Application of stochastic analyses to EMC problems

The authors present stochastic methods as applied to power electronic systems. Such a problem is electromagnetic compatibility (EMC) of a convertible power source and a converted power consumer with a cycloconverter. Two cycloconverter systems (variable speed-constant frequency (VSCF) and constant speed-variable frequency (CSVF)) are considered under power source and commutator control signal voltage and frequency disturbances. Essentially, disturbances may be separated in to: `weak´ and fast stochastic, and `strong´ and slow deterministic. That allows introduction of an `instant´ power spectrum of the process defined by fluctuations at each value of the `strong´ disturbance. The authors deal with a power spectrum analysis method based solely on `strong´ random after-effects of fluctuations. The process may be related to the category of pulse random processes with constant period. A common method is applied for analytic definition of cycloconverter output spectrum