THREE-PHASE VOLTAGE INVERTER CONTROL METHOD Russian patent published in 2023 - IPC H02M7/53862 

FIELD: electric power engineering.

SUBSTANCE: invention can be used to control three-phase voltage inverters operating as part of variable frequency drives and uninterruptible power supplies. A method for controlling a three-phase voltage inverter containing a series-connected block for determining a sector, a block for determining the angle inside a sector, a block for calculating the connection time of basic vectors and pause time, a block for calculating modulating voltage curves, a block for modifying modulating voltage curves connected to a block for calculating reference angles and a generating block key control pulses, which is connected to a unit for generating a triangular reference voltage of pulse-width modulation, which consists in the fact that the voltage at the output of a three-phase voltage inverter is formed in accordance with the algorithm of classical vector pulse-width modulation and characterized in that in the modulating curves of the output voltages of the three-phase voltage inverter, sections are formed in which the values of the modulating curves of the inverter output voltages are equal to the positive value of the amplitude of the inverter output phase voltage when generating positive half-waves of the inverter output phase voltages and are equal to the negative value of the amplitude of the inverter output phase voltage when forming negative half-waves of the inverter output phase voltages, the duration of these sections is determined by the binding angle, which is equal to zero when the inverter radiator temperature is less than the threshold value and is directly proportional to the difference between the threshold and current values of the inverter radiator temperature when the inverter radiator temperature is above the threshold value, the maximum value of the binding angle is 120 electrical degrees.

EFFECT: maintaining the temperature of the keys of a three-phase voltage inverter within acceptable limits while ensuring a symmetrical three-phase system of inverter output voltages by reducing the number of switching switches during the PWM period in all phases of the inverter when the temperature of the keys exceeds a threshold value.

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