Views: 0 Author: Site Editor Publish Time: 2025-03-14 Origin: Site
In modern industrial and commercial buildings, the power distribution room is the core hub of power supply, and its power quality directly affects the stable operation of the whole facility. With the wide application of nonlinear load, such as frequency converter, uninterruptible power supply (UPS), computer equipment, etc., the problem of harmonic pollution is becoming more and more prominent, which brings many challenges to the power equipment in the distribution room. Active power filters (APFs), especially advanced devices such as ARK's AHF series, are a key solution for ensuring power quality in the power distribution room.
Harmonic pollution has many negative effects on the power equipment in the distribution room and the whole power system:
1. Equipment overheating and damage: Harmonic current will cause additional heat loss in transformers, cables, switchgear, etc., resulting in equipment overheating, shortening equipment life, and increasing the risk of failure.
2. Power factor reduction: Harmonics will affect the power factor, reducing the transmission efficiency of the distribution system, increasing the loss of electric energy, resulting in an increase in the cost of electricity.
3. Relay protection misoperation: Harmonics may cause the misoperation or refusal of the relay protection device, affecting the safe operation of the power system, resulting in production interruption.
4. Power quality decline: harmonic pollution will cause voltage waveform distortion, affect the quality of power supply, and interfere with the normal operation of sensitive equipment (such as precision instruments, medical equipment, etc.).
APF active power filter can monitor the harmonic current in the power grid in real time, and generate equal and opposite phase compensation current, so as to cancel the harmonic current and purify the power grid current. Taking ARK's AHF as an example, it works as follows:
1. Current detection: The external current transformer (CT) detects the load current in real time and transmits the signal to the internal digital signal processor (DSP).
2. Harmonic analysis and compensation current calculation: DSP uses advanced logic control algorithm and fast Fourier transform (FFT) to decompose the load current into active power and reactive power parts, and quickly and accurately calculate the harmonic content. The DSP then sends a pulse width modulation (PWM) signal to the internally insulated gate bipolar transistor (IGBT) driver board.
3. Compensation current generation: The IGBT driver board controls the switching frequency of IGBT according to the PWM signal, and generates compensation current opposite to the harmonic current phase on the inverter sensor.
4. Harmonic offset: the compensation current and harmonic current cancel each other in the system, so as to purify the grid current and reduce the adverse impact of harmonics on the equipment and the grid.
1. Efficient harmonic control: AHF can quickly respond to harmonic changes in the system, and effectively compensate for the second to 50 harmonics, with a compensation rate of more than 92%, significantly reducing harmonic content and improving power quality.
2. Improve equipment efficiency and life: By reducing the risk of equipment overheating and failure due to harmonics, AHF helps to extend the service life of transformers, cables and other equipment and reduce maintenance costs.
3. Optimize power factor: AHF can compensate reactive power while controlling harmonics, improve power factor, reduce electricity costs, and improve the overall efficiency of the distribution system.
4. Intelligence and flexibility: with intelligent control function, can automatically adjust the compensation strategy according to the change of system load. And the installation method is flexible, there are a variety of options such as wall-mounted and rack-type, to adapt to the spatial layout of different distribution rooms.
5. Reliability and stability: As a high-quality power equipment, AHF performs well in a variety of industrial and commercial environments, ensuring the stable operation of the distribution room.
AHF active power filters are suitable for all types of power distribution room scenarios with high power quality requirements, including but not limited to:
- Industrial plants: Factories with a large number of nonlinear loads such as frequency converters and uninterruptible power supplies have urgent needs for harmonic control.
- Commercial buildings: such as office buildings, shopping malls, hotels, etc., equipped with computer equipment, lighting systems, etc., harmonic pollution will affect equipment operation and user comfort.
- Data center: Where power supply quality and equipment stability are highly required, harmonic control is the key to ensuring data security.
Medical facilities: Medical equipment in hospitals is sensitive to power quality, and harmonic contamination can affect equipment accuracy and patient safety.