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The AHF active filter detects the load current in real time through the external current transformer (CT), and performs advanced logic control operations through the internal digital signal processor (DSP) to quickly track the command current. The intelligent fast Fourier transform (FFT) technique is used to decompose the load current into active power and reactive power, and calculate the harmonic content quickly and accurately. The AHF then sends a pulse width modulation (PWM) signal to the internal IGBT driver board to control the IGBT to switch at a frequency of 20kHz, and finally generates a compensation current equal to the harmonics and opposite the phase on the inverter, which is injected into the power system to offset the harmonics. At the same time, CT detects the output current and feeds it back to DSP, which carries out the next logical control to achieve more accurate and stable system operation.
AHF active filters are available in a variety of mounting modes and sizes to meet the needs of different application scenarios:
Wall-mounted: Compact design for space-constrained locations.
Rack mounted: Easy to integrate into rack systems for easy management and maintenance.
Cabinet type: can accommodate multiple modules, suitable for large capacity requirements.
1. High performance power quality improvement
Excellent harmonic control ability: AHF can quickly detect and eliminate harmonic current generated by the load, including 5th, 7th, 11th and other characteristic harmonics, effectively reduce the total harmonic distortion rate (THD), and ensure the purity of the grid voltage waveform.
Dynamic reactive power compensation: In addition to harmonic control, AHF also has dynamic reactive power compensation. According to the reactive power demand in the system, the capacitive or inductive fundamental current is generated in real time to optimize the power factor, reduce the waste of reactive power, and improve the efficiency of the grid.
Three-phase imbalance control: For the unbalanced problem in three-phase systems, AHF can balance the three-phase current through real-time monitoring and compensation, reduce neutral line overload and voltage imbalance, and improve the stability and reliability of the system.
2. Intelligent control and real-time response
Advanced algorithms and fast processing: Using high-performance digital signal processor (DSP) and fast Fourier transform (FFT) technology, AHF is able to analyze the harmonic components of the load current in real time and generate the compensation current within 40 milliseconds, ensuring fast response and stability of the system.
Adaptive dynamic compensation: The compensation current of AHF is dynamically adjusted according to the harmonic and reactive power changes in the grid, avoiding over-compensation or under-compensation to ensure that the system is always operating in the best state.
Intelligent feedback and closed-loop control: The current transformer (CT) is used to monitor the power grid current in real time, and the feedback signal is transmitted to the DSP for processing, forming a closed-loop control system, and further improving the compensation accuracy and system stability.
3. Comprehensive protection function
Overload protection: When the harmonic current in the system exceeds the rated capacity of the AHF, the device automatically limits the output to ensure that the device will not be damaged by overload.
Overtemperature protection: built-in temperature sensor, real-time monitoring equipment operating temperature. When the temperature exceeds the set value, the system will automatically start the cooling system or enter the protection state to prevent the equipment from overheating.
Overvoltage and undervoltage protection: AHF can monitor the power grid voltage in real time, and when the voltage exceeds the normal range, the device will automatically take protective measures to avoid damage to the device and the power grid due to abnormal voltage.
Short circuit protection: When a short circuit fault is detected, AHF will immediately cut off the power supply, protecting the safety of the equipment and the grid.
4. Flexible configuration and expansion
Modular design: AHF adopts a modular architecture and supports the combination of multiple capacity modules. Users can flexibly configure device capacity according to actual requirements, which is convenient for later expansion and upgrade.
Various installation modes: Wall-mounted, rack-mounted, and cabinet installation modes are available to meet the space requirements of different application scenarios. Whether it is small industrial equipment or large data centers, you can find the right installation solution.
Customized services: For special application scenarios and requirements, AHF supports customized design, including voltage level, compensation capacity, communication interface, etc., to ensure that the equipment perfectly matches the needs of users.
5. Good human-computer interaction experience
Intuitive operation interface: Equipped with a high-resolution touch screen, users can complete the device setup, monitoring and fault diagnosis through simple operations, without complex professional knowledge.
Real-time data monitoring: The operation interface displays the current, voltage, harmonic content, power factor and other key parameters of the power grid in real time, helping users to grasp the operation status of the power grid at any time.
Remote monitoring and management: Support a variety of communication interfaces such as GPRS, WiFi and RS485, users can remotely monitor the operating status of equipment through mobile phones, computers and other terminals to achieve intelligent management.
Multi-language support: The operation interface supports multiple languages, which is convenient for users in different countries and regions.
1.Industrial field
Monocrystalline silicon furnace: effectively control the harmonics generated by the heating system of monocrystalline furnace, improve the power factor, and reduce the equipment failure rate.
Intermediate frequency furnace: The characteristic harmonics generated by the intermediate frequency furnace are treated to improve the power quality of the power grid.
Inverter application: Suitable for paper making, printing, food and beverage processing and other industries, control the harmonics generated by the inverter.
2. Business environment
Data center: Eliminates harmonics generated by the UPS to ensure power supply security.
Commercial buildings: Control the harmonics generated by nonlinear loads such as elevators and central air conditioners to improve power quality.
3.Medical unit
Hospital: Control the harmonics generated by medical equipment, frequency conversion air conditioning, etc., to ensure the power supply safety of key equipment.
4.Energy field
Coal mining enterprises: control harmonic pollution in mine power grid, improve power grid efficiency and equipment safety.
Cement building materials: Control the harmonics generated by the inverter, reduce the failure rate of equipment, and improve the efficiency of electric energy use.