METHOD FOR COMPENSATING INSTANTANEOUS POWER FAILURE IN HIGH VOLTAGE INVERTER AND HIGH VOLTAGE INVERTER SYSTEM USING THE SAME

PROBLEM TO BE SOLVED: To provide a method for compensating instantaneous power failure and a high voltage inverter system using the same in which, instantaneous power failure occurs in a high voltage inverter, mechanical dynamic energy being stored in a load is converted into electrical energy to deal with a power failure zone, thereby continuously operating the high voltage inverter without stop.SOLUTION: In a high voltage inverter including a plurality of power cells supplying a phase voltage to a motor by being connected in series, at a relevant point where an input voltage of the plurality of power cells is less than a reference value, an output frequency of the plurality of power cells is decreased by as much as a predetermined value, the output frequency is decreased with a predetermined deceleration gradient, and in a case where the input voltage is restored, the output frequency during restoration of the input voltage is maintained as long as a predetermined time.