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
Active harmonic filters function as a dynamic current source, sensing non-linear current demand and providing an instantaneous counter-response.
- Real-time monitoring and correction of fluctuating harmonics across varying load conditions.
- Integrated displacement power factor correction and load balancing to improve overall system capacity.
- Modular design enables parallel configuration of multiple units to scale mitigation capacity as facility loads increase.
- User-friendly HMI and communication ports for integration with SCADA and building management systems.
Typical Applications
The Lineator AAPF is specified for systems with dynamic, fluctuating non-linear loads requiring real-time harmonic mitigation and centralized compensation.
Data Centers
Centralized harmonic mitigation for facilities with variable-speed cooling systems, UPS infrastructure, and dynamic IT load profiles requiring real-time compensation across changing operating conditions.
Water and Wastewater
Real-time mitigation for treatment plants and pump stations with multiple VFD-driven motors, supporting compliance with utility harmonic limits across changing flow demands and operational cycles.
Oil & Gas
Dynamic harmonic mitigation for processing facilities, refineries, and extraction operations with VFD-driven pumps, compressors, and drilling systems operating under variable load conditions.
Healthcare
Active mitigation for hospitals and laboratories with sensitive diagnostic and imaging equipment where harmonic distortion can compromise measurement accuracy and equipment reliability.
Lineator™ AAPF
The Lineator Advanced Active Power Filter provides real-time harmonic mitigation for electrical systems with dynamic and fluctuating non-linear loads.
- Mitigates harmonics across a wide range of operating conditions.
- Provides centralized or group compensation for multiple non-linear loads.
- Supports displacement power factor correction and load balancing.
- Scalable design allows capacity to be expanded as system demand increases.
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
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?
Documentation and Resources
Access technical specifications, installation manuals, and white papers relevant to harmonic filtration.
Filter By Product
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.
Power Quality Assessment
Technical analysis to identify harmonic issues and optimize filter selection for facility-wide compliance.
Explore Power Quality Assessment
Field Service and Repair
Specialized support for equipment startup, commissioning, and maintenance.
SOLV™ Simulation Software
Complimentary software to predict harmonic performance and energy savings for any specific drive load.
Download SOLV™
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.
Discuss Your Application Requirements
Contact our sales team to identify the appropriate active filter configuration for your real-time harmonic mitigation needs.