DVR vs. AVC: Two different thing! Stop confusing things anymore.

DVR vs. AVC: Two different thing! Stop confusing things anymore.

Many people think DVR (Dynamic Voltage Restorer) and AVC (Automatic Voltage Regulator) are interchangeable because both deal with voltage sags.

In reality, their working principles are fundamentally different.
⚡ DVR – Energy Storage + Complete Power Takeover
A DVR is equipped with an ultracapacitor energy storage system.
When a voltage sag or even a very short power interruption occurs, the DVR can disconnect from the grid almost instantly and supply energy from its own ultracapacitors.

Our DVR works differently. When the grid voltage experiences a sag or even a complete interruption, the DVR immediately disconnects the load from the grid and takes over the power supply using its ultracapacitor energy storage system.

Therefore, the compensation is not determined by the depth of the voltage sag.
Whether the remaining grid voltage is 70%, 40%, or even 0%, the DVR can restore the load voltage to its required 100% rated level.
Instead of relying on the incoming grid voltage, it temporarily powers the load itself.

Once the grid returns to normal, the DVR reconnects and recharges its ultracapacitors.

✅ Response time: around 0.1 ms

✅ Can restore the load voltage to 100% in millisecond, even during deep voltage sags (such as 45% 60% or outage)
✅ Can also ride through ms level voltage interruptions that conventional regulators cannot handle.

⚡ AVC – Real-Time Voltage Compensation
Unlike a DVR, an AVC does not contain any energy storage.
It always remains connected to the grid and continuously measures the incoming voltage.
When a voltage sag occurs, the AVC calculates the missing voltage and injects only the required compensation voltage, allowing the load voltage to remain stable.

Because it depends on the grid voltage, it cannot maintain the load during a complete voltage interruption.

Which One Is Right for Your Application?
If your production line can tolerate only minor voltage fluctuations and complete outages are not a concern, an AVC is often a practical and economical solution.

However, if your process cannot afford even a few milliseconds of power interruption—such as semiconductor manufacturing, data centers, automated production lines, or other mission-critical applications—a DVR is the technology designed for that level of protection.

Although both products are designed to improve power quality, understanding how they work is the key to selecting the right solution.
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