Dynamic Voltage Restorer (DVR) is a series compensation device equipped with energy storage devices (systems), which has the ability to compensate for active power in addition to reactive power. It generates compensation voltage within 1 to 2 milliseconds, ensuring that the load side voltage is not affected by disturbances and guaranteeing the safe and reliable operation of sensitive loads, computers, and other equipment. DVR has been widely applied in high-precision fields such as integrated circuit manufacturing, power electronics chip manufacturing, aircraft, automobiles, and mobile phone manufacturing; as well as in high-security fields such as airports, hospitals, IT, and telecommunications industries.