Active Harmonic Filters
Active Harmonic Filters (AHFs) use power electronics to inject equal and opposite harmonic currents into the network in real time. They dynamically mitigate harmonics generated by sources such as variable speed drives and power electronic inverters, supporting grid compliance, enhancing system stability, and ensuring reliable operation across the electricity network.
Requirements
The requirements for an Active Harmonic Filter depend on the harmonic profile of your site, system voltage, and operational characteristics. Sites with variable speed drives, inverters, or rapidly changing loads often benefit most.
Key factors include:
• Voltage level (typically low voltage)
• Harmonic orders present and their variability
• System load balance and reactive power needs
A harmonic study provides the data needed to analyse harmonic voltage distortion, confirm compliance with standards such as IEC 61000, G5/5, or IEEE 519, and size the filter accurately.
Our Solutions
AHFs deliver a set of practical outcomes for your site:
• Real-time mitigation of multiple harmonic orders
• Improved compliance with grid standards (IEC 61000, G5/5, IEEE 519)
• Reduction of harmonic losses, nuisance tripping, and transformer noise
• Reactive power support and imbalance correction
• Enhanced protection of sensitive equipment and extended asset life
Applications include:
• Renewable energy sites (wind, solar, BESS)
• EV charging infrastructure
• Heat pumps
• High-tech manufacturing plants
• Airports and hospitals where power quality is critical
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