Reduction of total harmonic distortion of three-phase inverter using alternate switching strategy

Alternating current (AC) electrical drives mainly require smaller (or torque) ripples and lower total harmonic distortion (THD) of voltage for excellent drive performances. Normally, in practice, to achieve these requirements, the inverter needs be operated at high switching frequency. By operating frequency, size filter can reduced. However, which oftenly employs insulated gate bipolar transistor (IGBT) power applications cannot This is because, IGBT frequency above 50 kHz due its thermal restrictions. paper proposes an alternate strategy enable use improve THD In this strategy, each a group switches modified circuit will operate one-fourth The implemented using simple analog digital integrated circuits.