Inverter controlling device maximizing output voltage of inverter in overmodulation period

摘要

The inverter includes an inverting module including a plurality of switching elements, wherein the inverting module are configured for receiving a direct current (DC) stage voltage and for generating an output voltage of three-phases via switching of the switching elements. The device includes: a command voltage outputting unit configured for providing a pulse width modulation (PWM) control signal corresponding to an initial command voltage to the switching elements of the inverting module when the initial command voltage is within a voltage limit; a modulation index modifying unit configured for modifying a modulation index of the initial command voltage when the initial command voltage is outside the voltage limit; and an overmodulated command voltage generation unit configured for modifying the initial command voltage using the modified modulation index to form a modified command voltage and for limiting the modified command voltage to the voltage limit to generate an overmodulated command voltage.