High-Quality AHF Harmonic Filters from China Suppliers - Advanced Factory Solutions for Power Quality Improvement

In response to the critical issue of power harmonic pollution, the Advanced Harmonic Filter (AHF) stands out as the premier solution for enhancing power quality. Developed by leading suppliers in China, this innovative equipment employs cutting-edge power electronics and digital signal processing technology, utilizing high-speed DSP processing devices for optimal performance. The AHF functions as a harmonic current generator, adeptly tracking harmonic components within the current and generating equal amplitude harmonic currents with opposite phases.

Comprising two main components—the instruction current operation circuit and the compensation current generation circuit—the AHF operates efficiently. The instruction current operation circuit continuously monitors the circuit's current in real-time, converting the analog signals into digital formats. These signals are then processed by a high-speed digital processor (DSP), which separates harmonic from fundamental currents to derive the instruction current. This instruction is subsequently transmitted to the compensation current generation circuit as a pulse width modulation (PWM) signal, facilitated through the current tracking control and drive circuits. By utilizing IGBT and IPM power modules, the AHF generates a compensation current that mirrors the harmonic current's amplitude but with opposite polarity. This compensation current is injected back into the power grid, effectively canceling out harmonic disturbances, ensuring dynamic, rapid, and thorough harmonic mitigation.

Product Detail

Applications

Industrial Applications

AHF is suitable for industrial high-capacity loads, such as rectifiers, frequency converters, large UPS, arc furnaces, intermediate frequency furnaces, three-phase chargers, and other three-phase load scenarios.

Commercial Buildings

Suitable for single-phase nonlinear loads in commercial buildings, such as energy-saving lamps, computers, UPS, elevators, variable frequency air conditioners, etc., which generate third harmonic and heat up the N-line.

Technical Indicators

Item	400V			660V
Current rating	50A	100A	135A	50A	100A
Voltage level	380V, 440V, 480V			600V, 660V, 690V
Voltage range	-20%~+15%
Frequency	50/60Hz±5%
Phases	3 phase 3 wire, 3 phase 4 wire
Response time	≤10us
Parallel operation	Unlimited, Max 6 modules for one SAM controller
Overload capability	110%, 1 minute
Efficiency	≥97.5%
CT location	Grid side or Load side
Function	Harmonics, reactive power, unbalance compensation
Harmonics	Up to 50th order
Communication	Modbus, TCP/IP, IEC61850, others upon request

Product Advantages

Thermal design and structural optimization based on precise models

Miniaturization, occupying less space

Compensation for specified harmonic frequencies, adjustable inductive/capacitive reactive power compensation, automatic detection of unbalanced loads, suppression of system resonance, and full function monitoring system

Increased operational efficiency by avoiding unplanned stops

Lower losses in the transformer

Prolonged equipment lifetime and standard compliance

Frequently Asked Questions (FAQ)

What applications are suitable for Active Harmonic Filters (AHF)?

AHF is suitable for industrial high-capacity loads (such as rectifiers, frequency converters, large UPS, and arc furnaces) and single-phase non-linear loads in commercial buildings (such as energy-saving lamps, computers, elevators, and variable frequency air conditioners) to prevent N-line overheating.

What are the supported voltage levels and ranges for the AHF?

The AHF supports two primary voltage levels: 400V (covering 380V, 440V, and 480V) and 660V (covering 600V, 660V, and 690V), with a wide voltage tolerance range of -20% to +15%.

What is the response time and efficiency of the AHF?

The AHF delivers an ultra-fast response time of ≤10us and operates at a high efficiency of ≥97.5%, ensuring instant power quality correction with minimal energy loss.

Can multiple AHF modules be connected in parallel?

Yes. Parallel operation is unlimited, allowing a maximum of 6 modules to be controlled by a single SAM controller for flexible capacity scaling.

What specific functions does the AHF perform?

The system provides comprehensive compensation for harmonics (up to the 50th order), reactive power, and unbalanced loads, while simultaneously suppressing system resonance.

How does the AHF improve transformer efficiency and equipment life?

By mitigating harmonic currents, the AHF reduces losses in the transformer, avoids unplanned operational stops, prevents N-line overheating, and ultimately prolongs equipment lifetime.