Abstract
The voltage sag problem in a power grid can be solved by a voltage regulator. In this study, the voltage regulator based on thyristor was used to compensate the single-phase and three-phase voltage of voltage sag fault, so as to recover the normal level of voltage. The simulation analysis was carried out on MATLAB. The results showed that voltage sag faults mainly affected the amplitude of voltage, but not the frequency of voltage. After voltage regulation, the single-phase and three-phase voltage waveforms in the fault period had a certain recovery, but the voltage regulator had a certain hysteresis effect.
Highlights
The problem of power quality1 can be summed up as the problem of voltage, current, and frequency which will make the user unable to use electricity normally or cause the electrical equipment to fail
After the thyristor voltage-regulating system stabilized, the voltage according to the set effective working voltage, the voltage sag within a certain period of time was set using the voltage adjusting device: the voltage reduced by 2.5% within 0.4 s
After the PWM voltage regulation system stabilized the voltage according to the set effective working voltage, the voltage sag within a certain period of time was set using the voltage adjusting device: the voltage reduced by 2.5% within 0.4 s
Summary
The problem of power quality can be summed up as the problem of voltage, current, and frequency which will make the user unable to use electricity normally or cause the electrical equipment to fail. In the single-phase and threephase AC model experiments, the change trend of voltage waveform detected at both ends of the load light under the two AC voltage regulation methods was basically consistent with the simulation experiment. In the single-phase AC thyristor voltage regulation experiment, the duration of voltage sag was 0.40 s, the compensation response time was 0.51 s, and the voltage before and after compensation was 195 and 200 V, respectively. In the single-phase AC PWM voltage regulation experiment, the duration of voltage sag was 0.40 s, the compensation response time was 0.91 s, and the voltage before and after compensation was 195 and 199 V, respectively. Total harmonic distortion, that is, using thyristor for voltage regulation could make AC voltage distortion smaller
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
