DVR (Dynamic Voltage Regulator) is a series compensation device with an energy storage device (system). In addition to compensating reactive power, it also has the ability to compensate active power. When the system voltage temporarily drops, it can restore the user-side voltage to normal within a few milliseconds.

        DVR function: When the grid voltage temporarily drops, the DVR can provide safe and reliable power quality for the back-end equipment to avoid damage to the equipment caused by grid voltage drops or surges. The DVR monitors the grid voltage in real time, and when a voltage drop or surge is detected, it can quickly switch the power supply of the back-end equipment to the transient voltage regulator. The shutdown of the DVR is controlled by software, and the switching time can be controlled within 1 millisecond, thereby ensuring that the power supply of sensitive back-end equipment is not affected by voltage surges or drops.

        The significance of grid stability: Grid stability refers to maintaining the same voltage and frequency levels across the entire grid to ensure a balance between power supply and demand. This balance prevents interruptions and maintains the reliability of the grid. Any fluctuations in the grid will directly affect end users in terms of equipment damage and high electricity bills. For second-level voltage sag prevention and control, the application of DVR has the best TCO (total cost of ownership throughout the life cycle), and supercapacitors play a very important role in DVR.

    Main features of DVR application:

1) Large capacity:

In large factory production lines, the required DVR capacity is large, which means that when a voltage sag occurs, the energy storage medium needs to provide more than a thousand amperes of current in an instant.

Supercapacitors can be configured with a backup time of seconds thanks to their high power density.

Lead-acid batteries generally need to be configured to the minute level, resulting in over-configuration and low cost performance.

At the same time, supercapacitors have extremely strong high-current charging characteristics, which can achieve rapid energy storage and safely cope with the next voltage sag.

2) Short backup time:

Most voltage sags last less than 3s and have low energy requirements. Therefore, for DVR applications, although supercapacitors have low energy density, they are still very suitable for use with this DVR.