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Active Harmonic Filter (AHF)

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Active Harmonic Filter (AHF) Specification

Power Rating
30/50/60/100/120/200/250/300 A

Material
Mild Steel

IP Rating
IP54

Usage & Applications
Harmonic Mitigation, PF improvement, Load Balancing

Features
Dynamic current compensation

Operating Temperature
40 Celsius (oC)

Display Type
Digital

Frequency
50 Hertz (HZ)

Phase
3 Phase

Rated Current
25 Ampere (amp)

Warranty
1 year

Rated Voltage
480 Volt (V)

Product Type
Active Harmonic Filter

Output Power
300 Ampere (amp)

Protection
IP54

Output Voltage
480 Volt (V)

Output Current
300 Ampere (amp)

Output Type
Sinewave

Current Waveform
Sinewave

Application
Harmonic Mitigation

Size
Available in different ratings

Color
Black

Active Harmonic Filter (AHF) Trade Information

Minimum Order Quantity
1 Unit

Payment Terms
Cash in Advance (CID), Letter of Credit at Sight (Sight L/C)

Supply Ability
10 Units Per Month

Delivery Time
15 Days

Sample Policy
Contact us for information regarding our sample policy

Main Export Market(s)
Asia

Main Domestic Market
All India

Certifications
ISO 9001

About Active Harmonic Filter (AHF)

Active Harmonic Filter (AHF)

Overview

Active Harmonic Filters (AHFs) are advanced power quality

devices designed to eliminate harmonics from electrical systems,

improve power factor, and stabilize voltage levels. With the rising use

of non-linear loads like variable frequency drives (VFDs), computers,

and LED lighting, harmonic distortion in power systems has become

a common challenge. AHFs play a crucial role in mitigating these

distortions and ensuring the efficiency, safety, and longevity of

the electrical infrastructure.

What is Harmonic Distortion?

Harmonic distortion occurs when non-linear loads draw current in

abrupt pulses rather than smooth sine waves. This leads to the

generation of voltage and current harmonic distortion that can:

Overheat transformers and motors

Trip circuit breakers unnecessarily

Increase energy losses

Shorten equipment lifespan

How Does an Active Harmonic Filter Work?

An AHF monitors the load current in real-time and injects equal in

amplitude and opposite in direction harmonic currents to cancel out

the distortion. Unlike passive filters, which are tuned to specific

frequencies, AHFs use advanced power electronics and digital signal

processing to adapt dynamically to changing load conditions.

Types of Active Harmonic Filters

Active Harmonic Filters are categorized based on their topology,

application, and connection method:

1. Shunt Active Harmonic Filters

These are the most common type of AHF. They are connected in

parallel (shunt) with the load and primarily target current harmonics.

They detect harmonic components in the load current and inject

compensating currents to neutralize them.

Applications:

Industrial plants with variable speed drives

Commercial buildings with significant non-linear loads

Data centres.

2. Series Active Harmonic Filters

Connected in series with the load, these filters address voltage

harmonics. They inject compensating voltages to maintain the

sinusoidal nature of supply voltage.

Applications:

Critical equipment protection

Systems with significant voltage distortion

3. Hybrid Harmonic Filters

These filters combine the benefits of both active and passive filters.

The passive part handles fixed-frequency harmonics, while the active

part addresses dynamic or wide-range harmonic components.

Applications:

Large-scale industrial systems

Cost-sensitive projects needing broad harmonic mitigation.

Working Principle in Steps :

1. Sensing:

The AHF continuously monitors the load current using

current transformers (CTs).

2. Signal Processing (Harmonic Detection):

Using techniques like Fast Fourier Transform (FFT) or

Instantaneous Reactive Power Theory, it separates the

harmonic components from the fundamental frequency.

3. Reference Generation:

A reference signal is created that is equal in magnitude but

opposite in phase to the unwanted harmonic components.

4. Current Injection:

A Voltage Source Inverter (VSI) generates and injects the

compensating current into the power line via a filter inductor,

cancelling the harmonics in the load current.

5. Feedback Control:

A closed-loop controller (typically a PI or predictive

controller) ensures real-time and accurate tracking of

harmonics, maintaining system stability and performance

Key Features

Dynamic response: Can react in real-time to changing

harmonic conditions.

Selective compensation: Targets specific harmonics (like the

3rd, 5th, 7th, etc.).

Improves power factor: Often also used for reactive power

compensation.

Reduces heating and losses: Prevents overheating of

transformers, cables, and motors.

Compact design: Modern AHFs are modular and can be

integrated easily into existing systems.

Benefits of Active Harmonic Filters

Improved Power Quality: Clean power for sensitive and

critical equipment.

Enhanced Energy Efficiency:Enhanced power factor,

reduced losses and better system performance.

Extended Equipment Life: Lower thermal and electrical

stress on components.

Regulatory Compliance: Meets IEEE-519 and other

harmonic standards.

Dynamic Compensation: Real-time adaptation to load

changes.

Conclusion

Investing in an Active Harmonic Filter is a smart move for businesses

aiming to optimise power quality, ensure equipment reliability, and

comply with energy standards. Whether you're operating a factory,

commercial complex, or data centre, AHFs provide scalable and

effective solutions to modern power challenges.

Ratings & specs

The ratings of an Active Harmonic Filter (AHF) can vary

depending on the application, system voltage, load characteristics,

and the amount of harmonic mitigation required. However, standard

specifications and typical rating parameters include the following:

1. Voltage Rating:

Common voltage levels:

Low Voltage (LV): 220V, 400V, 480V, 600V

Medium Voltage (MV): 3.3kV, 6.6kV, 11kV (less

common for AHFs, but available)

Must match or be compatible with the system voltage.

2. Current Rating (Compensation Capacity):

Usually rated in amperes (A).

Typical ranges:

25A to 600A per unit (LV systems)

Modular units can be paralleled to increase capacity.

The current rating indicates how much harmonic current the

filter can compensate for.

3. Frequency:

Typically:

50 Hz or 60 Hz, depending on region.

4. Harmonic Compensation Range:

Most AHFs can compensate for:

3rd to 50th harmonic order.

Some advanced units go up to the 63rd harmonic.

5. Response Time:

Fast dynamic response:

Typically <1 ms to 5 ms.

Important for handling transient harmonics.

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More Products in Active Harmonic Filters Category

Active Harmonic Filter

Minimum Order Quantity : 10 Units

Product Type : Active Harmonic Filter

Usage & Applications : Harmonic Mitigation, PF improvement, Load Balancing

Features : Dynamic Harmonic Mitigation

Protection : IP54

Power Rating : 30/50/60/100/120/200/250/300 A

Get a Price/Quote