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AHF Panel
Active Harmonic Filter Cabinets

Factory-assembled active harmonic filter cabinets built with Forte GRIDVAR AHF modules. Available in three performance tiers — Standard (GRIDVAR-G), Compact (GRIDVAR-C) and Premium SiC (GRIDVAR-X). Same hardware platform as SVG panels — different firmware and control card for dedicated harmonic filtering.

GRIDVAR-G AHF GRIDVAR-C AHF GRIDVAR-X AHF THDi < 5% 2nd–51st harmonic Selective filtering
THDi reduction to <5%
2nd–51st harmonic orders
Selective harmonic compensation
Multi-cabinet parallel
Auto-commissioning
Division 02 — Active Power Quality

Three GRIDVAR AHF tiers,
one panel platform

Forte AHF Panels are factory-assembled active harmonic filter cabinets — each built around one of three GRIDVAR AHF module tiers. The physical panel platform is identical to SVG panels: CT, main breaker, HMI, controller and all internal wiring are common. The difference is in the control card and firmware — optimized for dedicated harmonic filtering rather than reactive power compensation.

GRIDVAR-G AHF — Standard Series. 2nd–51st harmonic, 220V–690V, up to 200A/module. Cost-effective filtering for general industrial harmonic problems.
GRIDVAR-C AHF — Compact Series. 2nd–51st harmonic, 400V, up to 150A. Ultra-slim modules for maximum cabinet density.
GRIDVAR-X AHF — Premium SiC Series. 2nd–51st harmonic, 220V–380V, 4µs response. For arc furnaces and extreme harmonic environments.

All three AHF panel types reduce THDi to below 5% at the point of common coupling, meeting IEEE 519 and IEC 61000-3-4 requirements. Each harmonic order can be individually prioritised for selective filtering. Multiple cabinets operate in parallel for higher capacity. Factory tested, shipped complete, ready for connection.

GRIDVAR-G AHF (Standard) GRIDVAR-C AHF (Compact) GRIDVAR-X AHF (SiC) THDi < 5% 2nd–51st harmonic Selective filtering
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Forte AHF Panel — Front View
Forte AHF Panel — Internal View
Forte AHF Panel — Detail View
3
GRIDVAR AHF module
tiers available
51st
Maximum harmonic order
(GRIDVAR-X SiC)
<5%
THDi target
at PCC
cosφ 1.00
Simultaneous reactive
power compensation
Panel Comparison

Three AHF Panel Tiers — Choose Your Module

All three panels share the same cabinet platform. The AHF module determines harmonic filtering performance.

ParameterGRIDVAR-G AHFGRIDVAR-C AHFGRIDVAR-X AHF
SeriesStandardCompactPremium SiC
Switching technologyAdvanced IGBT, 3-LevelHigh-Density IGBT, 3-LevelSiC MOSFET, 3-Level
Operating voltage220V / 400V / 480V / 690V400V (-15%~+15%)220V – 380V
Module capacity (A)15 · 25 · 30 · 50 · 75 · 100 · 125 · 150 A30 · 50 · 75 · 100 · 150 A20 · 35 · 50 · 75 · 100 A
Response time≤ 50 µs / ≤ 5 ms total≤ 10 ms4 µs / ¼ cycle (harmonic)
Harmonic filtering range2nd – 51st2nd – 51st2nd – 51st
Switching frequency25.6 kHz20 kHz> 100 kHz
THDi reduction< 5% at PCC< 5% at PCC< 5% at PCC
Selective filteringYes — individual harmonic priorityYes — individual harmonic priorityYes — individual harmonic priority
Max. parallel modules20 modules20 modules10 modules (smart rotation)
Operating temperature−20°C ~ +55°C−25°C ~ +55°C−25°C ~ +55°C
System efficiency> 97.5%≥ 97.5%Up to 98%
Filtering effectiveness> 95%> 95%Up to 98%
3-Phase balancingYes (Active)Yes (Active)Yes (Active)
OverloadAuto-limited at 100% rated capacityAuto-limited at 100% rated capacity110% Continuous
CommunicationRS485, CAN Bus, Modbus RTU, Mobile APP, Optional HMIRS485 / CAN, Optional HMIBluetooth / Mobile APP, RS485 / CAN / RJ45
IP ProtectionIP20~IP54IP20IP20
Best forGeneral industry, 690V plantsRetrofit, tight spaces, broad filteringArc furnaces, steel, extreme harmonics
Common Specifications

Shared AHF Panel Platform

These features are standard across all three AHF Panel types.

ParameterSpecification
ProductForte AHF Panel — Active Harmonic Filter Cabinet
Frequency50 / 60 Hz
Connection type3P3W and 3P4W
THDi target< 5% at point of common coupling (PCC)
Compensation modeSelective harmonic / broadband / combined with reactive
CommunicationModbus RTU + Ethernet + RS485
HMI7″ / 10″ touch screen LCD with harmonic spectrum display
Auto-commissioningOne-button setup with automatic CT ratio detection
ProtectionIntegrated main breaker, surge protection, thermal monitoring
Current transformersBuilt-in CTs (matched to cabinet capacity)
Enclosure ratingIP31 / IP42 / IP54 (configurable)
CoolingForced fan cooling with smart speed control
Parallel operationMultiple cabinets in parallel — linear capacity scaling
Factory testingFull FAT before shipment
StandardsIEC 61000-3-4 / IEC 61439-1 / IEEE 519
Key Features

Why Choose a Forte AHF Panel

A complete harmonic mitigation solution that arrives factory-tested and ready to connect — reducing THDi to IEEE 519 and IEC 61000 compliance levels.

THDi Reduction to <5%

Active injection of counter-phase harmonic currents reduces total harmonic distortion at the point of common coupling to below 5% — meeting IEEE 519 and IEC 61000-3-4 limits for all facility types.

2nd–51st Harmonic Orders

Covers the full range of harmonic orders encountered in industrial environments — from 2nd harmonic (arc furnaces) through 51st harmonic (high-frequency switching loads).

Selective Harmonic Compensation

Each harmonic order can be individually enabled, disabled or prioritised. Target only the harmonics that matter — for example, prioritise 5th and 7th while monitoring 11th and 13th.

Touch Screen HMI

Real-time harmonic spectrum display shows individual harmonic magnitudes before and after filtering. Trend logging and alarm history accessible from the cabinet front panel.

Auto-Commissioning

One-button commissioning automatically detects CT ratios, measures the existing harmonic profile and configures filtering priorities. Reduces setup time from hours to minutes.

Multi-Cabinet Parallel

Multiple AHF Panels operate in parallel with automatic load sharing and harmonic current distribution. Scale filtering capacity linearly without complex system reconfiguration.

Applications

Where AHF Panels Are Installed

Wherever non-linear loads generate harmonic distortion that exceeds utility limits or causes equipment interference.

🏭

VFD-Heavy Facilities

Variable frequency drives are the largest source of harmonic distortion in modern industry. AHF Panels clean the bus at the MCC level.

🏥

Hospitals & Data Centres

UPS systems and server power supplies generate significant 5th and 7th harmonics. Critical infrastructure demands clean power.

⚙

Automotive Manufacturing

Welding robots, servo drives and CNC machines create complex harmonic profiles requiring selective filtering.

🔬

Semiconductor Fabs

Ultra-sensitive processes require THDi well below 5%. AHF Panels provide the clean power environment that production demands.

🏗

Mining & Minerals

Large rectifier-fed DC drives for crushers and conveyors. High harmonic content at the 6-pulse and 12-pulse characteristic orders.

🧪

Petrochemical

Process control instrumentation sensitivity. AHF Panels prevent harmonic-induced measurement errors and relay malfunctions.

🏢

Commercial Buildings

LED lighting, IT equipment and elevator drives. Neutral conductor overloading from triplen harmonics in 3P4W systems.

☀

Renewables & Grid

Solar inverters and wind converters inject harmonics at the point of grid connection. Meet grid code requirements with active filtering.

Need reactive power compensation alongside harmonic filtering? Or prefer a hybrid active + passive approach for cost optimisation?

Compare all active products

Ready to specify an AHF Panel for your project?

Our engineering team will analyse your harmonic profile and size the correct filtering capacity — at no cost before commitment. Send us your power quality measurements.

Request a Quote — AHF Panel

Our engineering team will contact you within 1 business day. Urgent: +90 850 840 64 24

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