question 2: what are the benefits of active filter to electrical equipment? Deyin active filter can solve the following problems: 1. Sensitive loads interfere with each other, and the computer makes mistakes and crashes; 2. The protection device malfunctions or refuses to operate, and the switch trips; 3, the servo motor produces pulsation, the AC motor produces vibration, and the noise increases; 4. Electromagnetic interference caused by line conduction, digital transmission applause, and communication cut off; 5. The PC motherboard of fully automatic equipment is damaged; 6, lighting and display equipment flashing, etc.
Question 3: What are the benefits of installing active filter APF? Deyin active filter APF can improve the efficiency of transmission and distribution equipment resources and ensure the stability of system voltage; Ensure the quality, true and stable waveform and frequency of power grid, reduce the burden of power grid and increase the available capacity of power grid; The APF of Deyin active filter can solve the following problems: 1. The sensitive loads interfere with each other, and the computer makes mistakes and crashes; 2. The protection device malfunctions or refuses to operate, and the switch trips; 3, the servo motor produces pulsation, the AC motor produces vibration, and the noise increases; 4. Electromagnetic interference caused by line conduction, digital transmission clapping and communication cutting; 5. The PC motherboard of fully automatic equipment is damaged; 6, lighting and display equipment flashing, etc.; Deyin active power filter APF can solve the problems of overheating, damage and noise increase caused by increased loss of power transformers and generators; Can solve the problems of cable overheating, insulation aging, capacitor dielectric loss increase and overheating; It can solve the problems of increasing and overheating of neutral current; Deyin active filter can improve the use capacity of transformers and generators.
question 4: what are the functions or advantages of the active filter? How does it work? Compared with passive filter, active filter is a new, more complex and expensive solution. It belongs to the power electronic device, which can eliminate the interference of different frequencies at the same time even if the initial conditions change. It can be used alone or specially for serious pollution source equipment, such as the rectifier of static uninterruptible power supply.
its working principle is to detect the harmonics of the power supply, and then inject components with the same spectrum but opposite phases to eliminate them, so as to ensure the low harmonic content at the power supply entrance. Therefore, the active filter provides an optional instantaneous harmonic compensation scheme, which reduces the electrical loss. In addition, it also improves the power factor and can even compensate some unbalanced currents. At present, there are many application cases. In high-power occasions, multiple units can be used in parallel, and their capacity can reach hundreds of KVA. It's not bad to have a company in Beijing that develops and produces its own active filters, and the products of New Energy Powerhouse are also applied in many places.
question 5: advantages and disadvantages of active filter: it can dynamically filter out all harmonics and completely absorb the harmonics in the system; No resonance will occur. Disadvantages: the cost is too high; Limited by hardware, it can't be used in large-capacity occasions: the single set of active filter capacity does not exceed 1KVA, and the current maximum applicable grid voltage does not exceed 69V V.
question 6: the application of active filter in power distribution system. There are reactors and active filter cabinets in the capacitor cabinet. 1. First, the cabinet that can't take the original compensation can be sampled. That is to say, the signal can't include reactance and capacitance.
2. When your cabinet is running, the reactance will have sound, which is certain, because high frequency is also a harmonic. Fu 3. What you said is too heavy. Yes, the reactance has a certain number of times, and there are more than 5 or 7 times, but the active filtering is 2-5, which means that some will be absorbed, some will be released, and all the filtering capacity is large, which means that it can be used, but there will be interference. Try to deal with the signal acquisition and grounding.
4. The design concept is to compensate the others that can't be compensated, and others can only filter out 5 and 7. This device filters out the rest.
Question 7: What role does the operational amplifier of the active low-pass filter play? Both passive and active filters are based on the same prototype, and their filtering characteristics are the same.
passive RC filter can't be equated with active RC filter, active RC and passive LC can realize Bottworth function, but it is not ideal to realize this function with passive RC, and its lowest attenuation value is extremely high (which is little known). Therefore, the passive RC function is generally not used as the filter approximation function.
not only that, but also through calculation, the quality factor of passive low-pass second-order filter is very low, and the highest quality factor can reach .5, but this can not be achieved at all frequencies.
the operational amplifier plays an amplification role. I don't know if you can understand this. The operational amplifier has two functions, comparison and amplification.
question 8: applications of active filters. Satons active power filters can be widely used in power distribution networks of industries, businesses and government organizations, such as power systems, electrolytic electroplating enterprises, water treatment equipment, petrochemical enterprises, large shopping malls and office buildings, precision electronics enterprises, power supply systems of airports/ports, and medical institutions. According to different application objects, the application of HTAPF-I active power filter will play a role in ensuring power supply reliability, reducing interference, improving product quality, prolonging equipment life and reducing equipment damage. ■ In order to meet the operation needs of large-scale data center computer rooms in the communication industry, the use capacity of UPS in the communication power distribution system is greatly increasing. According to the investigation, the main harmonic source equipment of communication low-voltage distribution system is UPS, switching power supply, variable frequency air conditioner, etc. The harmonic content generated by them is high, and the displacement power factor of these harmonic source devices is extremely high. By using active filter, the stability of communication system and distribution system can be improved, the service life of communication equipment and power equipment can be prolonged, and the distribution system can be more in line with the design specification of harmonic environment. ■ The third harmonic in most semiconductor industries is very serious, mainly due to the large number of single-phase rectification equipment used in enterprises. The third harmonic belongs to zero-sequence harmonic, which has the characteristics of gathering in the neutral line, leading to excessive neutral line pressure and even sparking phenomenon, which has great production safety hazards. 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. Serious harmonic pollution will inevitably affect the service efficiency and service life of equipment in distribution system. ■ Due to the need of production in petrochemical industry, there are a large number of pump loads in petrochemical industry, and many pump loads are equipped with frequency converters. The wide application of frequency converters has greatly increased the harmonic content in the distribution system of petrochemical industry. At present, most of the rectifier links of frequency converters use 6 pulses to convert AC into DC, so the harmonics generated are mainly 5th, 7th and 11th times. Its main hazards are the harm to power equipment and the deviation in measurement. Using active filter can solve this problem well. ■ In chemical fiber industry, in order to greatly improve the melting rate, improve the melting quality of glass, prolong the furnace life and save energy, electric flux heating equipment is often used in chemical fiber industry, and electricity is directly sent to the fuel-heated glass tank kiln by means of electrodes. These devices will produce a large number of harmonics, and the spectrum and amplitude of three-phase harmonics are quite different. ■ Intermediate frequency furnaces, rolling mills, electric arc furnaces and other equipment commonly used in the steel industry of steel/intermediate frequency heating industry will have a great impact on the power quality of the power grid, which will cause frequent overload protection actions of capacitor compensation cabinets, serious heating of transformers and power supply lines, frequent fuse blowing, and even cause voltage drop and flicker. ■ Welding machine in automobile manufacturing industry is an indispensable equipment in automobile manufacturing industry. Due to the randomness, rapidity and impact of welding machine, a large number of welding machines have caused serious power quality problems, resulting in unstable welding quality, robots with high degree of automation unable to work due to unstable voltage, and reactive power compensation system unable to work normally. ■ DC motor harmonic control Large DC motor sites need to convert AC into DC through rectifier equipment first. Due to the large load capacity of such projects, there is serious harmonic pollution on the AC side, resulting in voltage distortion and serious accidents. ■ The use of automated production lines and precision equipment In automated production lines and precision equipment occasions, harmonics will affect their normal use, causing failures of intelligent control systems and PLC systems. ■ Hospital system Hospitals have very strict requirements on the continuity and reliability of power supply. The automatic power supply recovery time for Class places is T≤15S, that for Class 1 places is .5S≤T≤15S, that for Class 2 places is T≤.5S, and the total harmonic distortion rate of voltage is THDu≤3%. X-ray machines, CT machines and nuclear magnetic resonance * * * oscillators are all loads with extremely high harmonic content. ■ Thyristor dimming system and large LED equipment in theater/gymnasium are all harmonic sources, which will generate a large number of third harmonics in the operation process, which will not only cause low efficiency of power equipment in the distribution system, but also cause stroboscopic lighting, which will cause noise and even failure to weak electrical circuits such as communication and cable TV.
question 9: can the active filter realize the function of reactive power compensation? No, although SVG, like APF principle, is an inverter principle, the waveform generated by active filtering is opposite to the harmonics in the line to offset the line harmonics, while SVG generates currents with the same frequency and different phases with the line to emit or absorb reactive power, so the reactive power compensation cannot be realized. Although the power factor has a certain relationship with harmonics, it has little to do with reactive power.