H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/1
H02M 5/257 (2006.01)
Patent
CA 1137165
52-AY-E1189 ABSTRACT OF THE DISCLOSURE A phase angle balancing circuit for a variable speed constant frequency (VSCF) power system is disclosed. Multiphase electric power signals from cycloconverters are summed to produce continuously and automatically the zero sequence voltage of the multiphase electric power signals. The zero sequence voltage signal is provided to each of the modulator stages associated with the cycloconverters to effect phase angle correction of the phase relationships between the multiphase electric power signals. A bandpass filter, having a passband center frequency centered on the preselected frequency of the multiphase electric power signals, is added to the phase angle balancing circuit of the present invention to make the zero sequence corrective means stable as a well damped negative feedback system. The bandpass filter also eliminates undesirable frequency harmonics and "hash" on the signal having the zero sequence voltage caused by undesired frequency components in the multiphase electric power signal system. In addition, another bandpass filter can be added having its frequency centered on the n harmonic (where n is the number of phases in the multiphase electric power system) for producing an n harmonic sequence voltage, which is also applied to each of the modulator stages. This additional path reduces the n harmonic distortion in the power system voltage waveform.
348742
Company General Electric
Eckersley Raymond A.
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