Three-phase PWM-switched autotransformer voltage-sag compensator based on phase angle analysis

• Main Authors: Mansor M., Rahim N.A.
• Other Authors: 6701749037
• Format: Article
• Published: Korean Institute of Power Electronics 2023
• Subjects: Peak detection; RMS detection; Voltage sag; Voltage sag compensator; Voltage sag detection; AC-AC power converters; Electric energy storage; MATLAB; Power converters; Voltage control; Voltage regulators; AC-AC converters; Dynamic voltage restorer (DVR); Matlab/Simulink simulation; Output voltages; Voltage sag detections; Voltage sags; Electric autotransformers

Many voltage sag compensators have been introduced, including the traditional dynamic voltage restorer (DVR), which requires an energy storage device but is inadequate for compensating deep and long-duration voltage sags. The AC-AC sag compensators introduced next do not require a storage device and they are capable of compensating voltage sags. This type of compensator needs an AC-AC converter to regulate the output voltage. Presented in this paper is a three-phase PWM-switched autotransformer voltage sag compensator based on an AC-AC converter that uses a proposed detection technique and PWM voltage control as a controller. Its effectiveness and capability in instantly detecting and compensating voltage sags were verified via MATLAB/Simulink simulations and further investigated through a laboratory prototype developed with a TMS320F2812 DSP as the main controller.