Title :
Parallel operation of modular power factor correction circuits
Author :
Moo, Chin S. ; Cheng, Hung L. ; Lin, Ping H.
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan
fDate :
5/1/2002 12:00:00 AM
Abstract :
The parallel operation of modular power factor correction circuits is illustrated. The modular units using boost converters are operated at a constant frequency with variable duty-ratio. Flexible load demand is met by changing the number of operating modules under the maximum current limit. The operating modules have the same frequency and duty-ratio, but are equally phase-shifted to each other by a fraction of the switching period to reduce the ripple content and to increase the ripple frequency of the input current. With this phase-shifted control strategy, balanced current sharing among modules can be achieved by operating the boost converters at discontinuous current mode, without the need of extra current control circuit. A prototype circuit consisting of 15 modular units, which supply the attempted power rating of 3.75 kVA was implemented to verified the theoretical prediction
Keywords :
AC-DC power convertors; harmonic distortion; phase shifters; power conversion harmonics; power factor correction; rectifying circuits; switching circuits; 3.75 kVA; boost converters; constant frequency; input current ripple frequency; modular power factor correction circuits; parallel operation; phase-shifted control strategy; switching period; variable duty ratio; Active filters; Capacitors; Current control; Electromagnetic interference; Frequency conversion; Logic circuits; Power factor correction; Prototypes; Reactive power; Voltage control;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2002.1004247
