Researching solutions to improve the quality of direct power control for active rectification in electric drive systems using dicret torque control

Abstract

Currently, electrical drive systems with adjustable frequency of asynchronous motors are widely used in industry and life with the following advantages: low price, easy motor speed adjustment, energy saving, easy repair and replacement due to industrially standardized components. However, today's popular inverters have an uncontrolled rectifier structure using diodes that will cause harmonics to the input power supply, which increases the amplitude of the supply voltage and current, seriously affects the electrical equipment in the power system as well as losses on the lines. The solutions mentioned in the article aim to improve the direct power control method in the frequency-controlled electric drive system using the direct control method of three-phase asynchronous motor torque.