The DVR dynamic voltage regulator only intervenes when the grid voltage drops temporarily, and can generate compensation voltage within a few milliseconds to restore the voltage to normal value, ensuring that the voltage waveform is a standard sine wave. The energy for compensating the power grid is directly provided by the supercapacitor in the DVR. In the event of a voltage drop, the grid voltage can be cut off, and the supercapacitor can fully provide energy to the load without being affected by grid voltage fluctuations. The compensation depth can cover 0-130%, effectively managing voltage sag and avoiding economic and production losses caused by voltage fluctuations for users. The application of supercapacitors in DVR dynamic voltage regulators ensures stable power consumption of equipment, perfectly compensating for residual voltage from 0 to 100% to 100% rated voltage, with a full response time of less than 5ms. At the same time, it avoids capacity waste caused by production equipment shutdown, is maintenance free, duty free, and highly reliable, greatly solving the occurrence of power quality problems in the power grid. It provides the ultimate temporary voltage reduction solution for power quality sensitive industries and safeguards the safe and stable operation of equipment power consumption.