AHF&SVG in Data Center Industry The Active Harmonic Filter adopts advanced power electronics technology to detect the harmonics in the grid in real time, generate the reverse phase compensation current through the converter, and dynamically filter out the harmonics in the grid.Static Var Generator can be real-time dynamic compensation, can compensate for the perceptual reactive power and the tolerance of the reactive power, and will not occur overfill, underfill, can stabilize the system voltage.     The Background   Due to the uninterrupted load power supply in the data center machine room, a large number of UPS and switching power supply and frequency conversion air conditioning are used.The input levels of these devices are three-phase arrangement, generating a large number of harmonics.Switch the power supply and UPS equipment to first rectify the AC into DC, and then through the secondary transformation, into the corresponding DC and AC.During the period, the primary current of the transformer is controlled through the switch pipe, not only generating harmonic during the rectification, but also reflects the high frequency harmonic to the power supply, resulting in high neutral current of the distribution transformer, and the harmonic will be polluted to the grid through the distribution transformer.     The PQ Problem   Both the switching power supply and the input of the UPS generate a harmonic current, and the final harmonic current is pooled on the total generating row.A large amount of harmonic current will cause the following harm to the communication room: harmonic current will interfere with the communication signals of adjacent wires.The harmonic current in the power grid increases the total current, which can easily lead to the misaction of the protection devices and lead to delayed work accidents.Harmonics will reduce the stability and life of equipment, cables, transformers and other equipment.Harmonic current occupies the transformer capacity, increases the load rate of the transformer, and may cause the transformer noise.If the necessary harmonic control measures are not taken, it will bring serious harmonic pollution to the input power grid.When serious, it will endanger the safe operation of the input grid and various electrical equipment across the grid in this grid.   The Solution of YTPQC-AHF and YTPQC-SVG   There is a serious current harmonic problem in a data center, and the harmonic current distortion rate reaches 32.8%, mainly for 3,5 and 7 harmonics.Through field testing and simulation analysis, our technical team gives a configuration scheme of 1200A  Active Power Filter and 600Kvar Static Var Generator for harmonic filtering and reactive power compensation.     The Technical Performance   After the YTPQC-APF Active Power Filter device management, the field harmonic current decline range is very obvious, the current distortion rate on the site will decrea...

AHF&SVG in Metallurgical Industry YTPQC-AHF Active Harmonic Filter reduced harmonic levels results in improved electrical network reliability and reduced operating costs. Nuisance tripping of protective devices and nuisance clearing of fuses due to harmonic heating effects is greatly reduced.Compared with the traditional capacitor bank, YTPQC-SVG Static Var Generator has the advantages of fast response and high compensation accuracy without under-compensation or over-compensation problems, avoid reasonance,etc.   The Background The development of modern industry increases the demand for metals, making the metallurgical industry develop rapidly.The electrical equipment of metallurgical enterprises has the characteristics of large capacity, most of the perceptual load, large load impact and braking speed, high degree of automation, work continuity and so on.   The PQ Problem Medium-frequency furnace is widely used in the metallurgical industry, mainly used in the smelting of non-ferrous metals and ferrous metals.The working frequency of medium frequency furnace is between 50~20000 Hz, which has the advantages of high thermal efficiency, short melting time, less burn loss of alloy elements, wide melting materials, less pollution to the environment, and can accurately control the temperature and composition of metal liquid.However, in the use of medium frequency furnace, it will produce a large number of harmonics, resulting in serious harmonic pollution in the power grid, causing great harm to the whole power system.   The Solution YTPQC-AHF and YTPQC-SVG According to the field situation, we configure 500A Active Harmonic Filter and 250kVAr Static Var Generator to address the field power quality problems. The Technical Performance From the field test data (below figure), after the YTPQC-AHF and YTPQC-SVG, the field power quality problem is well solved, the current waveform from zigzag wave to sine wave, the harmonic current distortion rate from 61.3% to 3.5%, and the system power factor from 0.67 to 0.99.   The Photos   Click here to view more applications.  

The Industry A large number of automation equipment in commercial complex automation systems requires high quality power supply.However, a considerable part of these devices have become the harmonic distortion disturbance source of the low-voltage power supply system due to their nonlinear load characteristics.Cause distribution system pollution, harm to the surrounding communication system and even the distribution system.   The background Commercial complex harmonic mainly has the following two sources: The harmonic sources formed by a large number of nonlinear loads, such as elevator / escalator, water supply system pump and air conditioning fan inverter, office and computer network, UPS power supply, electronic lighting, cause voltage and current distortion of distribution system; accounting for more than 80% of the total harmonics. Background harmonic, the public power grid itself has a certain harmonic content, transmitted from the power grid side to the distribution system. The Problem The load in the commercial complex system mainly includes lighting, elevator, central air conditioning, etc., among which the single-phase load equipment such as lighting mainly produces 3 harmonics, while the elevator and central air conditioning load driven by frequency converter mainly produces 5,7,11 and 13 harmonics.For the harmonic situation of commercial complex system, the best solution is to adopt active filtering technology.The active filter device adopts advanced power electronics technology to detect the harmonics in the grid in real time, generate the reverse phase compensation current through the converter, and dynamically filter out the harmonics in the grid.   The Solution The main load of Shanghai National Exhibition Center is elevator / escalator, water supply system pump and air conditioning fan inverter, office and computer network, UPS power supply, electronic lighting, etc., which produces a large number of harmonics in the process of use. According to the site situation, we configure 400A Active Harmonic Filter cabinet, and the following is the on-site governance effect.After intalled YTPQC-SVG, the PF changed from 0.91 to 1.Meanwhile, installed the YTPQC-SVG Static Var Generator , the current waveform is well improved, and the harmonic current distortion rate is reduced from 34.7% to 1.5%.   The Performance The Picture   Click here to view more applications.  

The Industry The intermediate frequency electric furnace has high electrical efficiency and thermal efficiency, short melting time, power saving, less floor space, low investment, easy to realize process automation and production flexibility. The medium frequency electric furnace is suitable for smelting cast iron, especially suitable for melting alloy cast iron, nodular cast iron and vermicular cast iron.Its adaptability to the charge is also strong, and the variety and size of the charge can be varied within a wide range.   The background Commercial complex harmonic mainly has the following two sources: The harmonic sources formed by a large number of nonlinear loads, such as elevator / escalator, water supply system pump and air conditioning fan inverter, office and computer network, UPS power supply, electronic lighting, cause voltage and current distortion of distribution system; accounting for more than 80% of the total harmonics. Background harmonic, the public power grid itself has a certain harmonic content, transmitted from the power grid side to the distribution system.   The Problem The main load on the site of a machinery factory is an intermediate frequency furnace. Due to the large amount of harmonics generated when the intermediate frequency furnace works, the transformer on site is noisy, and the protection fuse of the capacitor cabinet is frequently burned out and cannot operate normally. Lower Power Factor(0.66) cause penalty from electricity company.   The Solution For the on-site situation, we configure 500A Active Harmonic Filter and 250kvar Static Var Generator to manage the on-site power quality problems. It can be seen from the field test data (see the figure below) that after the treatment of the YTPQC-AHF active power filter and the YTPQC-SVG Static Var Generator, the field power quality problem has been well resolved, and the current waveform is determined by the sawtooth wave before compensation. It becomes a sine wave, the harmonic current distortion rate is reduced from 61.3% to 3.5%, and the system power factor is increased from 0.67 to 0.99.   The Performance The Picture   Click here to view more applications.  

YTPQC-SVG Static Var Generator in Residential Power Distribution Industry Static Var Generator is based on the voltage-type inverter principle, and uses the insulated gate bipolar transistor (IGBT) to control the size and phase of the inverter AC voltage, so as to achieve the purpose of reactive power and harmonic compensation.Since the switching frequency of IGBT is very high (up to tens of kHz), So the SVG can quickly compensate for the reactive load, At the same time, a very high compensation accuracy can be achieved, The SVG is currently the best solution in the field of reactive power control.     The Background The residential area power grid belongs to the low-voltage distribution network, which is generally connected to the large power grid by 10/0.4kV transformer. The load in the network is mostly working in the three-phase 480V and single-phase 220V voltage levels, mainly for some small capacity loads, such as air conditioning, refrigerator, TV and other household appliances.Most household appliances are non-linear loads and produce a lot of reactive power during use.   The PQ Problem Reactive power is too large, its adverse effects are also very prominent, the increase of reactive power will lead to the increase of the system current and apparent power, resulting in the capacity of the generator, transformer and other electrical equipment and wire increase.The increase of reactive power will increase the total current, thus increasing the loss of the equipment and the line, and increasing the voltage drop of the line and the transformer.   The Solution of YTPQC-SVG Mixed reactive power compensation is widely used in residential distribution networks. The compensation capacity is generally configured according to 30% of the transformer capacity, and the SVG capacity and capacitor capacity are generally configured according to user needs.The transformer capacity of a residential distribution station in Shanghai has 800kVA, and a 240kvar YT-SVG Static Var Generator device is equipped on site.   The Technical Performance Reactive power and power factor before compensation Reactive power and power factor after compensation   The Photo  Click here to view more applications.

YTPQC-SVG Static Var Generator in Petrochemical industry YTPQC-SVG Static Var Generator detects load current in real time through internal and external CT and analyzes the reactive current of load by TI DSP and FPGA, then generates PWM signal to IGBT inverter(3 Level) to generate inductive or capacitive current and compensate reactive current to realize the target power factor. YTPQC SVG can also compensate phase imbalance.Overheating of motors, transformers, switch-gear and cables is also reduced which increases their life expectancy and reduces maintenance costs. For new installations, over-sizing of distribution equipment to reduce harmonic susceptibility can be reconsidered.   The Background The main loads used in the Petrochemical industry are motors. With the maturity of science and technology and more and more development towards energy saving and intelligent direction, a large number of energy saving and a large number of inverter leads to a large number of 3 / 5 / 7 / 11 (2n + 1) sub harmonics.   The PQ Problem Jiangsu hengke new material co., Ltd. is located in Nantong TongZhou Binjiang district (WuJie Town) HengLi textile new material industrial park, park with a total investment of 20 billion yuan, stage construction annual output of 2.4 million tons of differentiated, functional new fiber and intelligent, super simulation function polyester new materials, science, industry, trade integrated industrial base, high-tech textile materials. The company have a large penalty from electricity company due to the poor power factor.   The Solution YTPQC-SVG The harmonic source is mainly 6-pulse frequency converter at site, and the main harmonics are 5th or 7th harmonics. According to the load situation, 2 sets 450A active harmonic filter panels and 4 sets 400kVAr Static Var Generator panels are configured for harmonic control.   The Technical Performance Take a 375A AHF panels for example, THDi is 50% before AHF, and the THDi reduced to 5% after AHF installation. The compensation effect is good, which completely solves the reactive and harmonic problems in the field.   The Photos   Click here to view more applications.