Bh. Kwon et Eh. Song, HIGHLY STABLE POWER-SUPPLY USING DIGITALLY CONTROLLED PHASE-CONTROLLED RECTIFIER AND ACTIVE-FILTER, IEE proceedings. Electric power applications, 141(5), 1994, pp. 221-228
A design of a highly stable current-controlled power supply combining
a phase-controlled rectifier (PCR), passive filter and active filter i
s investigated. A digital phase-locked voltage control (PLVC) with a c
apability of compensating the thyristor firing angles under an unbalan
ced power source is proposed; otherwise the PCR output voltage has low
-order subharmonics whose suppression requires a bulky passive filter.
The digital PLVC has a fast dynamic characteristic as an inner contro
l loop of the PCR. To suppress further the output ripple, an active fi
lter using a transformer is introduced and its design is described thr
ough a frequency-domain analysis. An optimal, proportional and measura
ble-variable feedback (IPM) controller is designed using a time-weight
ed performance index based on a time-domain analysis. The design metho
d based on the time-weighted performance index gives a better response
characteristic than that based on the conventional performance index.
It is shown via experimental results that the proposed scheme gives g
ood dynamic and static performance.