High-Quality AHF Harmonic Filter from China Suppliers and Factory for Power Quality Improvement

In the face of significant power harmonic pollution challenges, the Active Harmonic Filter (AHF) stands out as the most efficient solution for enhancing power quality. Developed with cutting-edge power electronics and digital signal processing technologies, this specialized equipment utilizes high-speed DSP processing devices to combat harmonic disturbances effectively. The AHF acts as a harmonic current generator, meticulously tracking harmonic components within the power system and producing harmonic currents that are equal in amplitude but opposite in phase.

The AHF comprises two main components: the instruction current operation circuit and the compensation current generation circuit. The instruction current operation circuit performs real-time current detection, converting analog signals into digital formats, which are then processed by a high-speed digital processor (DSP). This separation of harmonic and fundamental currents allows for accurate instruction current generation, which is transmitted to the compensation current generation circuit as a pulse width modulation (PWM) signal through a current tracking control and drive circuit. Utilizing advanced IGBT and IPM power modules, the AHF generates compensation currents that match the amplitude and reverse the polarity of the existing harmonic currents. This innovative approach injects counteractive currents into the power grid, effectively mitigating harmonic issues and ensuring dynamic, rapid, and comprehensive power harmonic management. As leading China suppliers and factory providers of AHF technology, we are dedicated to delivering high-quality solutions that enhance power quality and sustainability in electrical systems.

Product Detail

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. 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

Products Advantage

Thermal design and structural optimization based on precise models.

Miniaturization, occupying less space.

Compensation for specified harmonic frequencies, adjustable inductive and capacitive reactive power compensation system, 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.

Standard compliance.

Frequently Asked Questions

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

AHF is highly suitable for industrial high-capacity loads (such as rectifiers, frequency converters, large UPS, arc furnaces, intermediate frequency furnaces, and three-phase chargers) as well as commercial building single-phase non-linear loads (such as energy-saving lamps, computers, elevators, and variable frequency air conditioners).

Q: What is the response time and efficiency of this AHF?

The system features an ultra-fast response time of ≤10us and operates with a high efficiency of ≥97.5%.

Q: How many AHF modules can be operated in parallel?

Parallel operation is unlimited, allowing up to 6 modules to be controlled by a single SAM controller.

Q: What harmonic orders can the AHF compensate for?

The system can mitigate harmonics up to the 50th order, providing comprehensive power quality control including harmonic, reactive power, and unbalance compensation.