GY-AHF Active Harmonic Filter
GY-AHF Active Harmonic Filter is an advanced power quality solution designed to reduce harmonic distortion and improve electrical system stability. Based on DSP+CPLD full-digital control technology and three-level topology, it detects load harmonic currents in real time and injects compensation currents to effectively suppress 2nd–50th order harmonics.
Supporting three-phase unbalance correction, unlimited parallel expansion and flexible rack-mounted or wall-mounted installation, GY-AHF delivers fast harmonic response within 40ms and filtering efficiency above 95%. It is widely applied in industrial facilities, commercial buildings and data centers to reduce harmonic pollution, protect electrical equipment and enhance power quality performance.
•High-Performance Harmonic Filtering — Effectively compensates 2nd–50th order harmonics with a filtering efficiency ≥95% and fast dynamic response within 40ms, improving power quality in systems with nonlinear loads.
•Advanced Digital Control Technology — Powered by DSP+CPLD full-digital control and three-level topology, featuring precise harmonic detection and intelligent compensation algorithms for accurate current correction.
•Flexible Modular Expansion — Supports modular configurations from 25A to 200A with unlimited parallel connection capability, available in rack-mounted and wall-mounted installation options.
•Wide Voltage Compatibility — Designed for AC220V, 380V, 500V, 690V and 800V power systems with 50Hz/60Hz frequency compatibility and high operating efficiency.
•Multiple Compensation Modes — Provides harmonic filtering and optional three-phase unbalance correction, achieving comprehensive power quality improvement for industrial and commercial applications.
Product Features
Overview
The working principle of the active power filter device (GY-AHF) is to detect the load current in real time. Based on a specified sub harmonic current detection algorithm, the harmonic current is gradually separated, and a control signal is generated according to the set filtering percentage to drive the IGBT to output a compensation current with the same amplitude and opposite phase as the load harmonic current, achieving harmonic compensation function.
Performance characteristics
(1) DSP+CPLD full digital control core, three-level topology technology, advanced harmonic detection algorithm, and PWM control strategy.
(2) Modular design allows multiple modules to be connected in parallel, with small footprint and easy maintenance.
(3) The independent air duct and independent plate compartment structure design ensure the stable operation of the equipment.
(4) 100% current limiting output can be set to ensure long-term stable operation of the equipment.
(5) Supports optional modes of harmonic compensation, harmonic compensation+threephase unbalance compensation.
(6) Current harmonic compensation capability: compensation rate ≥ 95%.
(7) Unbalance compensation capability: The imbalance degree after compensation is ≤ 5%.
Technical Parameter
| Model | 220V | 220V | 380V | 500V | 690V | 800V | |
| Altitude | <2000m; above 2000 m, derate according to GB/T 3859.2 | ||||||
| Ambient temperature | -10 ~ +50℃ (above 40 ℃, capacity derating ≤30%) | ||||||
| Relative humidity | ≤90% relative humidity, no condensation on the surface at a monthly minimum temperature of 25 ℃ | ||||||
| Pollution degree | Pollution degree ≤ Class III | ||||||
| Operating voltage | AC220V (-20%~+20%) | AC220V (-20%~+20%) | AC380V (-20%~+20%) | AC500V (-20%~+20%) | AC690V (-20%~+15%) | AC800V (-20%~850V Max) | |
| Operating frequency | 50Hz/60Hz (45Hz~63Hz) | ||||||
| Rated compensation capacity | 25A | 7/15/25/50/75/100/ 150/200A |
100A | 100A | |||
| Grid configuration | L/N | Three‑phase three‑wire, three‑phase four‑wire | Three‑phase three‑wire | ||||
| Number of parallel units | No restrictions | ||||||
| Overall efficiency | ≥97% | ||||||
| Switching frequency | 16kHz | 12.8kHz | |||||
| Function selection | Harmonic compensation | Harmonic compensation, Harmonic compensation + three‑phase unbalance compensation | Harmonic compensation | ||||
| Current harmonic compensation range | 2‑50 times, with adjustable compensation rate per time | ||||||
| Current harmonic compensation | Current harmonic compensation ≥95% | ||||||
| Unbalance compensation capability | Unbalance degree after compensation ≤5% | ||||||
| Full response time | < 40ms | ||||||
| Noise level | ≤60dB | ≤65dB | |||||
| Communication method | 2 RS485 communication interfaces (Wi‑Fi supported) | ||||||
| Protection functions | Overload, software/hardware overcurrent, grid over‑undervoltage, grid voltage imbalance, power supply failure, overtemperature, frequency anomaly, short‑circuit protection, etc. | ||||||
| Overload capability | Rated 1.2 times overload for 60 seconds | ||||||
| Installation method | Rack‑mount / Wall‑mount | ||||||
| Cable entry | Rear cable entry (rack‑mount), top cable entry (wall‑mounted) | ||||||
| Protection rating | IP20 (IP54 available on request / customizable) | ||||||
User Manual
Frequently Asked Questions About GY-AHF Active Harmonic Filter
GY-AHF Active Harmonic Filter Product Details
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