Active power filter is a new type of power electronic device for dynamically suppressing harmonics and compensating reactive power. It can compensate harmonics with varying sizes and frequencies as well as varying reactive power.
Active power filters can be widely used in the distribution network of industries, commerce and organizations, such as: power systems, electrolytic plating companies, water treatment equipment, petrochemical companies, large shopping malls and office buildings, precision electronics companies, airports/ports Power supply systems, medical institutions, etc. According to different application objects, the application of active power filter will play a role in ensuring the reliability of power supply, reducing interference, improving product quality, extending equipment life and reducing equipment damage.
1. Communication industry
In order to meet the operational needs of large-scale data center computer rooms, the use of UPS capacity in the communication power distribution system has increased significantly. According to the survey, the main harmonic source equipment of the communication low-voltage power distribution system is UPS, switching power supply, inverter air conditioner, etc.
The harmonic content produced by them is relatively high, and the displacement power factor of these harmonic source devices is extremely high. The use of active filters can improve the stability of the communication system and the power distribution system, extend the service life of the communication equipment and power equipment, and make the power distribution system more in line with the design specifications of the harmonic environment.
2. Semiconductor industry
The third harmonic in most semiconductor industries is very serious, mainly due to the large number of single-phase rectifier equipment used in enterprises. The third harmonic is a zero-sequence harmonic, which has the characteristic of converging on the neutral line, which leads to excessive pressure on the neutral line and even sparking, which poses a huge production safety hazard.
Harmonics can also cause circuit breakers to trip and delay production time. The third harmonic forms a circulating current in the transformer, which accelerates the aging of the transformer. Severe harmonic pollution will inevitably affect the efficiency and life of the equipment in the power distribution system.
3. Petrochemical industry
Due to production needs, there are a large number of pump loads in the petrochemical industry, and many pump loads are equipped with frequency converters. The extensive application of frequency converters has greatly increased the harmonic content in the petrochemical industry's power distribution system.
At present, most of the inverter rectification links use 6 pulses to convert AC to DC, so the harmonics generated are mainly 5th, 7th, and 11th. The main hazards are the hazards to power equipment and deviations in measurement. The use of active filters can solve this problem well.
4. Chemical fiber industry
In order to greatly increase the melting rate, improve the melting quality of the glass, and extend the furnace life and save energy, electric flux heating equipment is commonly used in the chemical fiber industry, and the electricity is directly sent to the fuel-heated glass kiln with the help of electrodes. These devices will generate a lot of harmonics, and the spectrum and amplitude of the three-phase harmonics are quite different.
5. Automobile manufacturing
Welding machines are indispensable equipment in the automobile manufacturing industry. Due to the randomness, rapidity and impact of welding machines, the large-scale use of welding machines causes serious power quality problems, resulting in unstable welding quality and highly automated robots. Unable to work due to unstable voltage, and the reactive power compensation system cannot be used normally.
6. Theater/Gymnasium
Thyristor dimming systems, large-scale LED equipment, etc. are all harmonic sources, and a large number of third harmonics will be generated during operation, which not only causes low efficiency of power equipment in the power distribution system, but also causes light flickering, which is harmful to communication. , Cable TV and other weak electric circuits produce noise or even malfunction.
In modern telecommunications equipment and various control systems, digital filters are also widely used. Here are some of the most successful applications.
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