FIELD: electricity.
SUBSTANCE: evaluation device (5) of the detected direct current voltage value selects the detected dc voltage values at certain T period intervals, saves the detected values of Vn to Vn-m of dc voltage, which were detected during current time tn to time tn-m of the selection, which is earlier by m cycles of selection (m>1) than current time tn, and calculates value Vn+1 of evaluation of dc voltage within the next time tn+1 by using detected values of Vn to Vn-m of dc voltage, thus expressing the curve connecting values of Vn to Vn-m of voltage by means of concrete function. Output voltage control device (6) to which value Vn+1 of evaluation of dc voltage is supplied corrects control signal value of output voltage and supplies corrected output voltage control signal value to power converter (1).
EFFECT: improving accuracy.
16 cl, 18 dwg
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