Phase angle balancing circuit for a variable speed constant freq

Details Phase angle balancing circuit for a variable speed constant freq Phase angle balancing circuit for a variable speed constant freq

1978-11-06

1980-08-19

Shoop, William M.

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

By semiconductor converter

290 38R, H02M 5257

Patent

active

042187320

ABSTRACT:
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 voltage 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.

REFERENCES:
patent: 3152297 (1964-10-01), Peaslee
patent: 3289070 (1966-11-01), Caldwell et al.
patent: 3873928 (1975-03-01), Lafuze
patent: 3902073 (1975-08-01), Lafuze
patent: 3908130 (1975-09-01), Lafuze
patent: 3937974 (1976-02-01), Lafuze
patent: 4044296 (1977-08-01), Dhyanchand et al.

Affiliated with

Also associated with

Rating

Phase angle balancing circuit for a variable speed constant freq does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Phase angle balancing circuit for a variable speed constant freq, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase angle balancing circuit for a variable speed constant freq will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1429979