PWM inverter control system and method

Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

363 95, H02M 112

Patent

active

053813286

ABSTRACT:
A PWM inverter system having a sine (low-pass) filter. The sine filter includes a reactor and a capacitor, and is connected to the output of a PWM inverter. The instantaneous current flowing through the capacitor, and the instantaneous output current supplied from the sine filter to a load are detected. An instantaneous voltage command value is corrected on the basis of the detected current values. This makes it possible to limit oscillating waveforms involved in the output voltage of the PWM inverter without using a damping circuit which was connected in parallel with the capacitor in a conventional sine filter. The capacitor of the sine filter may be composed of a plurality of capacitors connected in parallel, and this will serve to further reduce the size of the sine filter. In a parallel operation of a plurality of PWM inverters, a cross current, that is, the difference between an instantaneous output current command value and an instantaneous capacitor current command value is reduced by correcting the instantaneous voltage command value. This makes it possible to share the current assigned to each PWM inverter with high stability.

REFERENCES:
patent: 4792885 (1988-12-01), Cunman et al.
patent: 4899269 (1990-02-01), Rouzies
patent: 5001619 (1991-03-01), Nakajima et al.
patent: 5012400 (1991-08-01), Yasuda
patent: 5045989 (1991-09-01), Higaki et al.
patent: 5268832 (1993-12-01), Kandatsu

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

PWM inverter control system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with PWM inverter control system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PWM inverter control system and method will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-855397

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.