Nonexistence of Symmetric Modes of Subharmonic Oscillations in Three-Phase Circuit : An Approach by Interval Computation

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This paper describes how the symmetry of a three-phase circuit prevents the symmetric modes of several subharmonic oscillations. First, we make mathematically it clear that the generation of symmetrical 1/3l-subharmonic oscillations(l=1, 2, ・・・)are impossible in the three-phase circuit. As far as 1/(3l+1)-subharmonic oscillations(l=1, 2, ・・・)and 1/(3l+2)subharmonic oscillations(l=O, l, ・・・)are concerned, the former in negative-phase sequence and the latter in positive-phase sequence are shown to be impossible. Further, in order to confim the above results, we apply the method of interval analysis to the circuit equations and obtain all steady state solutions with unsymmetric modes.
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2001-12-01