AHF is a power electronic device that eliminates harmonics in electrical networks by generating counter-harmonic currents.
Active Harmonics Filters
Active Harmonic Filters – Power Quality, Perfected
PurityElec’s Active Harmonic Filters (AHF) are advanced power conditioning solutions that actively monitor and correct electrical harmonics in real time. Designed for industrial, commercial, and renewable energy applications, they improve power quality, enhance efficiency, and ensure compliance with international harmonic standards (IEEE 519, IEC 61000-3).
Key Features
• Real-Time Harmonic Compensation – Instantly reduces THD (Total Harmonic Distortion) to below 5%.
• Dynamic Load Balancing – Improves phase balance, reduces neutral currents, and optimizes system performance.
• Scalable Modular Design – Parallel connection for higher capacity without downtime.
• Advanced DSP Control – High-speed detection and response for fluctuating loads.
• Improved Power Factor – Corrects lagging or leading power factor to near unity.
• User-Friendly Interface – Touchscreen display with remote monitoring options.
Applications
• Industrial Plants – Motors, drives, welding machines, CNC equipment
• Commercial Buildings – Data centers, malls, hospitals, airports
• Renewable Energy Systems – Solar farms, wind power, battery storage
• EV Charging Infrastructure – Reducing harmonic impact of fast chargers
• Utility & Grid Support – Maintaining network stability and compliance
| Technical Specifications | |
|---|---|
| Voltage Range | 208V – 690V (3-phase) |
| Current Ratings | 50A – 600A (expandable) |
| Harmonic Compensation | 2nd – 50th order |
| Response Time | < 200 microseconds |
| THD Reduction | < 5% (adjustable) |
| Cooling Method | Forced air or liquid cooling |
| Communication | Modbus, RS485, Ethernet, optional IoT connectivity |
Why Choose PurityElec Active Harmonic Filters?
At PurityElec, we believe clean power means better performance. Our AHFs are:
✔ Energy-Efficient – Reduce losses and improve operational lifespan of equipment
✔ Compliance-Ready – Meet global harmonic distortion standards
✔ Custom-Engineered – Tailored for your load profile and site conditions
✔ Low Maintenance – Designed for continuous 24/7 operation with minimal servicing
Frequently Asked Questions
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Q1. What is an AHF (Active Harmonic Filter)?
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Q2. Why do we need an Active Harmonic Filter?Non-linear loads like VFDs, rectifiers, UPS, and furnaces generate harmonics that cause overheating, malfunctions, and poor power quality. AHF solves this.
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Q3. How does an AHF work?It monitors the current waveform, detects harmonic distortion, and injects opposite-phase harmonic currents to cancel them.
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Q4. Can AHF also improve power factor?Yes, many modern AHFs provide both harmonic mitigation and limited reactive power compensation.
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Q5. What is the difference between a Passive Harmonic Filter and an Active Harmonic Filter?
- • Passive Filter: Uses tuned L-C components, fixed compensation, less flexible.
- • Active Filter: Uses electronics, dynamic, handles multiple harmonic orders simultaneously.
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Q6. Where are AHFs typically installed?In data centers, steel plants, textile mills, commercial complexes, and renewable energy systems.
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Q7. Can RPG and AHF be integrated into one system?Yes, some manufacturers provide hybrid solutions that handle both reactive power compensation and harmonic filtering.
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Q8. Which should be chosen: RPG or AHF?
- • If main issue is low power factor/voltage stability → RPG.
- • If main issue is harmonics → AHF.
- • If both exist → Hybrid RPG+AHF solution.