Name: GY-AHF-PLUS High-spec Active Harmonic Filter - GEYA Electrical Equipment Supply
SKU: GY-AHF-PLUS

Description

GY-AHF-PLUS High-spec Active Harmonic Filter – Overview

The GY-AHF-PLUS is a high-spec active harmonic filter for AC220V/380V systems, filtering 2nd–50th order harmonics with a ≥95% compensation rate and <40ms response. Upgraded from the standard GY-AHF, it adds neutral line zero-sequence current filtering up to 3 times the phase line current, Class A EMC performance (RE/CE) and resonance protection, making it well suited to data centers, commercial buildings and facilities with heavy single-phase nonlinear loads.

Working Principle

The GY-AHF-PLUS connects a voltage source converter (VSC) to the power grid in parallel via a filter. By detecting the load current in real time, it separates harmonic currents order by order based on a specified-order harmonic current detection algorithm. Control signals are generated according to the set filtering percentage, driving the IGBT power stage to output a compensation current with the same amplitude but opposite phase to the load harmonic current, cancelling harmonic distortion at the point of connection. The device additionally provides neutral line zero-sequence current filtering capability up to three times the phase line current, together with improved EMC performance and stability.

Key Features

DSP+CPLD full digital control core with three-level topology, advanced harmonic detection algorithm and PWM control strategy.
Modular design with multi-module parallel connection capability, small footprint and easy maintenance.
Independent air duct and independent board compartment structural design ensure stable operation of the equipment.
Supports 100% current-limiting output to ensure long-term stable operation.
Selectable compensation modes: harmonic compensation only, or harmonic compensation + three-phase unbalance compensation.
Current harmonic compensation rate ≥95%; 2nd–50th harmonics with individually adjustable compensation rate; unbalance degree after compensation ≤5%.
Neutral line zero-sequence current filtering capacity is three times that of the phase line.
EMC Radiated Emission (RE) and Conducted Emission (CE) tests meet Class A standard.
2 x RS485 communication ports with Wi-Fi support; forced air cooling for reliable thermal management.

GY-AHF-PLUS vs. Standard GY-AHF

Compared with the standard GY-AHF Active Harmonic Filter, the PLUS version focuses on 220V/380V applications with enhanced neutral line handling and electromagnetic compatibility:

Item	GY-AHF (Standard)	GY-AHF-PLUS (High-spec)
Voltage Classes	AC220V/380V/500V/690V/800V	AC220V/380V
Module Ratings	7A–200A	100A / 150A
Neutral Line Filtering	—	3× phase line current
Reactive Power Compensation	—	≥99%
EMC Performance	Standard	RE/CE meet Class A
Resonance Protection	—	Included

Both models share the same 2nd–50th order filtering range, ≥95% compensation rate, <40ms response time, ≥97% efficiency and unlimited parallel connection capability.

Reliable Protection & Overload Capability

The GY-AHF-PLUS integrates comprehensive protection functions, including overload, software/hardware overcurrent, grid overvoltage/undervoltage, grid voltage unbalance, power supply failure, overtemperature, frequency anomaly, short-circuit and resonance protection. The unit withstands 1.2 times rated overload for 60 seconds, and the overall efficiency reaches ≥97%.

Flexible Installation Options

Rack-mounted (rear cable entry) and wall-mounted (top cable entry) configurations are available with forced air cooling. The standard protection rating is IP20, with IP54 available on request. Suitable operating conditions include altitudes below 2000m (derating per GB/T 3859.2 above 2000m), ambient temperatures of -10°C to +50°C, and relative humidity ≤90% without condensation.

Typical Applications

- Data centers, hospitals and office buildings with heavy single-phase loads and high neutral currents
- Industrial plants with variable frequency drives, rectifiers and welding equipment
- EMC-sensitive environments such as broadcasting, laboratories and precision manufacturing
- Photovoltaic, wind power and energy storage systems requiring harmonic and unbalance compensation

Technical Parameters

Item	220V	380V
Operating Voltage	AC220V (-20%~+20%)	AC380V (-20%~+20%)
Operating Frequency	50Hz/60Hz (45Hz~63Hz)
Rated Compensation Capacity	100A, 150A
Grid Configuration	Three-phase three-wire / Three-phase four-wire
Number of Parallel Units	Unlimited
Overall Efficiency	≥97%
Switching Frequency	16kHz
Function Selection	Harmonic compensation / Harmonic compensation + three-phase unbalance compensation
Current Harmonic Compensation	≥95%
Harmonic Compensation Range	2nd~50th order, adjustable individual compensation rate
Unbalance Compensation Capability	Unbalance degree after compensation ≤5%
Neutral Line Filtering Capability	3 times that of phase filtering capacity
Full Response Time	<40ms
Noise Level	≤65dB
Communication Method	2 x RS485 communication ports (Wi-Fi supported)
Protection Functions	Overload, software/hardware overcurrent, grid over-/undervoltage, grid voltage unbalance, power supply failure, overtemperature, frequency anomaly, short-circuit protection, resonance protection, etc.
Overload Capability	1.2 times rated overload for 60 seconds
Electromagnetic Compatibility	EMC Radiated Emission (RE) and Conducted Emission (CE) meet Class A test standard
Cooling Method	Forced air cooling
Installation Method	Rack-mount / Wall-mount
Cable Entry	Rear entry (rack-mount) / Top entry (wall-mount)
Protection Rating	IP20 (IP54 customizable)
Altitude	<2000m; above 2000m, derate according to GB/T 3859.2
Ambient Temperature	-10°C to +50°C (above 40°C, capacity derating ≤30%)
Relative Humidity	≤90%, no condensation on the surface at a monthly minimum temperature of 25°C
Pollution Degree	≤ Class III

Frequently Asked Questions

1. What is the GY-AHF-PLUS?

GY-AHF-PLUS is the high-spec model of GEYA’s GY-AHF Active Harmonic Filter family. It connects a voltage source converter (VSC) to the grid through a filter in parallel, detects load current in real time, separates harmonics order by order and drives IGBTs to inject compensation currents with equal amplitude and opposite phase. It is built on the same DSP + CPLD three-level digital control core as the rest of the GY-AHF family but adds stronger neutral current filtering, Class A EMC performance and resonance protection for demanding sites.

2. What functions does the GY-AHF-PLUS provide?

Harmonic compensation — 2nd–50th order, compensation rate ≥95%, individually adjustable per order.
Three-phase unbalance compensation — residual unbalance ≤5%.
Neutral-line zero-sequence current filtering — up to 3× phase line current.
Fast dynamic response — full response time <40ms.
Comprehensive protection — overload, over-current, over-/under-voltage, over-temperature, short-circuit, frequency anomaly and resonance protection.

3. What are the key parameters that affect model selection?

System voltage: AC220V or AC380V — match to site distribution system.
Compensation capacity: 100A or 150A per module; multiple modules can be paralleled without limit.
Grid configuration: 3P3W or 3P4W — choose 3P4W where neutral harmonics are significant.
Compensation requirements: harmonic only, or harmonic + three-phase unbalance.
EMC requirements: PLUS meets Class A RE/CE for sensitive environments.
Site conditions: altitude, ambient temperature, IP rating and installation type (rack-mount or wall-mount).

4. What options and specifications are currently available?

The GY-AHF-PLUS series offers AC220V and AC380V models rated 100A or 150A, in rack-mounted (rear cable entry) or wall-mounted (top cable entry) configurations with forced air cooling. Modules can be paralleled without restriction to scale capacity, and IP54 protection is customizable in place of the standard IP20. For 500V/690V/800V systems or smaller module ratings from 7A, the standard GY-AHF series is available.

5. Which standards does it follow and which markets is it designed for?

The product’s EMC Radiated Emission (RE) and Conducted Emission (CE) performance meets Class A test standards, follows GB/T 3859.2 for altitude derating, and is engineered to help facilities meet widely adopted harmonic limits such as IEEE 519 and IEC 61000 series guidelines. With 50Hz/60Hz (45Hz–63Hz) compatibility, it suits commercial and industrial power systems across Asia, Europe, the Middle East, Africa and the Americas. Please contact us for market-specific certification documents.

6. What should I pay attention to during installation and maintenance?

Environment: altitude <2000m (derate per GB/T 3859.2 above), -10°C to +50°C (derate up to 30% above 40°C), humidity ≤90% without condensation, pollution degree ≤ Class III.
Ventilation: keep the forced air cooling path and independent air duct unobstructed.
Wiring: follow the correct cable entry (rear for rack-mount, top for wall-mount), connect the neutral line correctly for 3P4W systems, and verify CT polarity before energizing.
Maintenance: the modular structure allows individual modules to be serviced or replaced without shutting down the entire system.

GY-AHF-PLUS High-spec Active Harmonic Filter