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.

中文翻译：

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基于晶闸管的交流调压电路设计：单相与三相比较

电网电压暂降问题可以通过稳压器解决。本研究采用基于晶闸管的调压器对电压暂降故障的单相和三相电压进行补偿，使电压恢复到正常水平。仿真分析在MATLAB上进行。结果表明，电压暂降故障主要影响电压幅值，而不影响电压频率。调压后，故障期间的单相和三相电压波形有一定的恢复，但调压器有一定的滞后作用。