Active Harmonic Filters

Mirus designs active harmonic filters to provide real-time mitigation of current distortion in systems with dynamic and fluctuating non-linear loads. These shunt-connected devices utilize advanced power electronics to monitor the electrical network and inject compensating current to mitigate harmonics as they occur.

By providing centralized or group mitigation for multiple non-linear loads, active filters offer a flexible solution for maintaining IEEE 519 compliance in complex industrial and commercial power systems.

Technical Overview

⸻ OVERVIEW ⸻

Active harmonic filters function as a dynamic current source, sensing non-linear current demand and providing an instantaneous counter-response.

⸻ Applications ⸻

Typical Applications

The Lineator AAPF is specified for systems with dynamic, fluctuating non-linear loads requiring real-time harmonic mitigation and centralized compensation.

A large industrial electrical control cabinet with an open door, showing internal components, vents, switches, and warning labels inside. The exterior features buttons, a display screen, and ventilation grills.
⸻ ACTIVE HARMONIC FILTER SOLUTIONS ⸻

Lineator™ AAPF

The Lineator Advanced Active Power Filter provides real-time harmonic mitigation for electrical systems with dynamic and fluctuating non-linear loads.

⸻ RATINGS ⸻

Ratings at a Glance

Characteristic

Low-Voltage Active Filter (480 V)

Medium-Voltage Active Filter (Up to 35 kV)

Nominal Voltage

208 V–600 V

1 kV–35 kV

Harmonic Mitigation

2nd to 50th harmonic order

2nd to 50th harmonic order

Efficiency

96%–97.5%

98%–99% (with transformer)

Response Time

< 1 ms (typically < 300 µs)

< 1 ms

Compensation Type

Shunt (Parallel)

Shunt (Parallel)

Enclosure Options

NEMA 1, 3R, 4X

NEMA 1, 3R

⸻ ACTIVE HARMONIC FILTERS ⸻

Is an Active Harmonic Filter Right for Your Project?

Determining the appropriate harmonic mitigation strategy depends on load variability, efficiency requirements, and the total harmonic distortion limits of your facility. The following table provides a direct comparison between standard active alternatives and the Mirus passive solution.

Feature

Passive Harmonic Filter

Active Harmonic Filter

Mitigation Method

Series inductor/capacitor network

Parallel IGBT current injection

Operating Efficiency

> 99%

96%–97.5% (low-voltage)

Harmonic Spectrum

Full wide-spectrum mitigation

Up to 50th harmonic order

High-Frequency Noise

None (No supraharmonics)

Injects switching noise (> 50th)

Maintenance

Minimal (No fans or filters)

Periodic fan and filter service

Response Time

Instantaneous (Passive)

Real-time (< 1ms sensing)

Not sure which applies to your project?

⸻ RESOURCES ⸻

Documentation and Resources

Access technical specifications, installation manuals, and white papers relevant to harmonic filtration.

Filter By Product

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Spotlight on Harmonics in the Film Industry

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POWER QUALITY — A New Solution for Harmonics

A New Solution for Harmonics. T he need for harmonic mitigating devices is Figure 1, the 5th harmonic current.

⸻ SUPPORT ⸻

Lifecycle Support

Mirus supports its power quality portfolio with technical consultation and simulation tools to ensure optimal system performance and compliance.

Custom Engineering

Direct-to-engineering access for non-standard voltages, kVA ratings, and specialized enclosure designs.

⸻ Performance ⸻

Engineered for Performance

Mirus designs active harmonic filters with a focus on system integrity and real-world performance. Active filters are integrated carefully with surrounding infrastructure to prevent interference with sensitive controls.


The combination of deep expertise in magnetic design and power electronics enables engineered solutions that support long equipment lifespan and compliance with international power quality standards.

⸻ CONNECT ⸻

Discuss Your Application Requirements

Contact our sales team to identify the appropriate active filter configuration for your real-time harmonic mitigation needs.