Active Voltage Conditioner-AVC

The CoEpo AVC (active voltage conditioner) is an inverter-based system that protects sensitive industrial and commercial loads from voltage disturbances. Providing fast, accurate voltage sag and surge correction as well as continuous voltage regulation and load voltage compensation.

AVC (active voltage conditioner)Correction & Capacity

1.Complete compensation

Three-phase is as low as 60% residual voltage

Single-phase is as low as 40% residual voltage

2.Partial compensation

phase Utility side(input side) Load side (output side ) Corrected maintenance time
Voltage surplus Corrected voltage amplitude
3 70-130% 100% continuation
3 60% 100% 30 seconds
3 50% 90% Maximum inverter voltage528;528÷3.3=160;160/400=40%;
1* 55-130% 100% continuation
1* 40% 100% 30 seconds


400V:50 – 200kVA、300kVA 、600kVA 、900kVA 、1200kVA 、2400kVA

Larger capacity, customized  208V, 480V   3ph 50Hz


Who Needs an AVC (active voltage conditioner)?

Factories, facilities and commercial operations that are dependant on a good quality power supply so they can produce quality products without interruption need the AVC(active voltage conditioner)


Single Line Diagram

AVC (active voltage conditioner)monitors the input voltage at all times,Once the voltage deviates from the set point, within 3 milliseconds, it controls the IGBT inverter to add appropriate compensation voltage to the main loop through the series injection transformer, and adjusts the load end voltage to the rated value extremely quickly, thus eliminating the impact of the voltage drop from the input end of the grid on the load.

During this time, energy is extracted from the grid


AVC (active voltage conditioner)Sag Correction

When the voltage sag, there is often some power left in the grid to be used.

AVC(active voltage conditioner) does not contain energy storage components, and the energy required for voltage compensation is absorbed from the power grid.

AVC (active voltage conditioner)voltage fluctuation Correction:

The three-phase equilibrium overvoltage amplitude is 110%

Electric energy input = electric energy output, energy conservation

Internal Bypass Mode

AVC(active voltage conditioner) will automatically switch to power supply by bypass when its own equipment fails.

AVC(active voltage conditioner) in bypass mode, the inverter does not generate compensation

voltage, and the utility power directly supplies power to the load by injecting the secondary winding of the transformer without power failure.

AVC(active voltage conditioner) Specifications

Full correction

Three-phase sags down to 60% retained

Single-phase sags down to 40% retained


Continuous “ONLINE” adjustment,with the goal of a 100% nominal voltage output.

Over and under voltage regulation

Voltage vector phase angle error correction

Voltage unbalance correction

AVC (active voltage conditioner)Features and Benefits

Technical characteristics User’s benefit
No battery, flywheel and other energy storage components Maintenance-free,low operating cost, no

environmental pollution

Strong overload capability and dynamic response capability Perfect for protecting impact loads.
High reliability The failure rate is low, and the device itself will not cause load power failure.
Small occupation space It can be installed in the distribution room or clean room to save a lot of land cost.
High efficiency, and low loss Long-term operation, save a lot of power loss
Operate in four quadrants Suitable for regenerative loads, such as the following row elevators


Monitoring With Graphic Display

Comparison between AVC and UPS

AVC: 160~6400KVA static state UPS
On-line voltage regulation Yes Yes
Spare part Modular design means high versatility of parts More spare parts need to be purchased
Voltage suitability for supply voltages beyond 380 to 480V Suitable for 200V to 35kV Full power input-output transformers are required,

taking up additional space and making the efficiency lower

Power-off protection No, but power outages are very rare, so there is no need to add a lot of cost and complexity The batteries should be

checked for proper functioning, especially considering their age.

Energy back filling Yes, AVC can support energy back filling loads


The load energy backfill will trip the UPS and fail to support the load
Harmonic wave The AVC absorbs pure sine waves and does not pollute the power supply system A typical UPS uses a 6-pulse rectifier to draw harmonic rich current, which can cause problems in the power supply system such as overheating the transformer
Downstream fault clearing capability Superior downstream fault clearing capability Poor tolerance to downstream faults
Environmental impact (green level) Very slight environmental impact due to

high efficiency, long life and littl maintenance


Heavier environmental impact due to low efficiency and toxic substances such as lead, acid and plastic inbatteries. Plus battery disposal and recycling issues.

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