ANAPF dynamic filtering compensation device selected Ankrui

Description :

　　ANAPF dynamic filtering compensation device selection Ankerui harmonic to the power supply system is as follows:

　　1) Harmonics cause additional harmonic loss to the components in the public power grid, which reduces the efficiency of power generation, transmission and electrical equipment. A large number of third-order harmonics over the neutral line will cause overheating and even fire.

　　2) Harmonics affect the normal work of various electrical equipment. The influence of harmonics on the motor not only causes additional loss, but also causes mechanical vibration, noise and overvoltage, which causes serious overheating of the transformer. Harmonic causes capacitors, cables and other equipment overheating, insulation aging and shortened life, so that the damage.

　　3) Harmonics will cause local parallel vibration and series resonance in the public power network, thus amplifying the harmonics, which greatly increases the harm of the above 1) and 2), and even cause serious accidents.

　　4) Harmonics will lead to misoperation of relay protection and automatic devices.

　　5) Harmonics will interfere with adjacent communication systems, and light ones will produce noise and reduce communication quality; Severe cases lead to letter opening, loss, so that the communication system can not work normally.

　　Active filtering and intelligent capacitive technology

　　The concept of active power filter has been put forward in the early 1970s, but due to the influence of the technical conditions at that time, the circuit structure that has been planned has not been implemented. Since the 1980s, there have been numerous articles on the technology and improvement of source filters.

　　With the rapid development of China's economy and science and technology, a large number of applications and popularity of medium and high power and low power electronic equipment, the stability and security of the power grid is increasingly high, but also gave birth to the harmonic control and power compensation and other related technical equipment more and more high requirements. Active power filter (APF) is widely studied and applied because of its strong control effect on current type harmonics and reactive power compensation. Active power filter (APF) has many disadvantages, such as high cost, low capacity and large loss, although it can effectively control the current wave and carry out controllable reactive power compensation. The use of capacitors in parallel compensating the reactive load of the power network has the advantages of less unit investment, large capacity, small power loss and simple maintenance. Therefore, the parallel APF and intelligent capacitor technology have the advantages of good harmonic control ability of APF and large compensation capacity of reactive power compensation capacitor.

　　At present, the company uses frequency conversion devices, electric desalination, electric dust removal, electrolytic cells, electric heaters, switching power supply, UPS and many other power electronic equipment and most of the inductive load such as large motors and transformers, which causes insufficient reactive power output and low power factor, and also causes a large number of harmonic pollution to the power grid. The operation experience shows that the operation of the above equipment connected to the network will lead to serious harmonic pollution of the power supply system and reactive power loss and heating, which will induce electrical equipment accidents, resulting in power failure of equipment and open shutdown of equipment. Therefore, pioneering and intelligent active filtering capacitor technology combined use of active filter good harmonic governance power and reactive power compensation capacity and compensation capacitor, the advantages of eliminating harmonic and fine compensating reactive power not only to ensure the security of power system stability, improve power quality, reduce the loss of electricity and so on has very important significance, Moreover, studying the application of harmonic control and reactive power compensation technology in petrochemical power equipment can develop energy-saving and consumption reduction technology with high cost performance, good effect, good safety, convenience and stability for petrochemical power equipment, so as to achieve multiple purposes such as fault early warning and safety efficiency enhancement.

　　The key technology of active filter harmonic control

　　The basic principle of active power filter is shown in figure 1, the detection of voltage and current compensation object, compensation current by instruction current arithmetic circuit calculation command signal, the signal amplified by the compensation current generating circuit, it is concluded that the compensation current, the compensation current and load current to compensate harmonic and reactive current in offset, achieve the desired power supply current (figure 1, I L is the load current; ILF is the fundamental current; ILH is harmonic current; I C is the compensation current; I S is the power supply current).

　　Key technology of intelligent capacitor reactive power compensation

　　1) The use of imported thyristor control capacitor to achieve no contact, no impact and no filter switching, compared with the ordinary compensation cabinet also has the advantages of low loss, long life of components, maintenance free.

　　2) avoid harmonic resonance and prevent harmonic amplification.

　　3) Fast tracking system load reactive power change, real-time dynamic response.

　　4) Cutting without impact, zero crossing trigger, fast cutting speed, no mechanical contact, no arc reburning.

　　Through the above key technologies, modern power electronics green energy saving products are developed to provide petrochemical enterprises with automatic, intelligent and energy saving green products with reliable performance, so as to achieve the purpose of energy saving, cost reduction and environmental protection.

　　Dynamic reactive power compensation device adopts contactless semiconductor module as switch, adopts full intelligent control, and is composed of controller dynamic switching switch, capacitor, reactor and protective element. The controller tracks and measures the fundamental power factor and reactive current of the load in real time, compares it with the preset given value, and dynamically controls the switching of different groups of capacitors to ensure that the power factor always meets the set requirements. The thyristor zero - crossing trigger ensures that the switching capacitor has no impact, no inrush current and no transition process

　　System Introduction

　　Function:

　　The power quality analysis and governance system mainly studies the elimination of reactive power compensation and harmonic governance problems in the power supply and distribution system. Its main products include active power filters, low-voltage reactive power compensation devices, static reactive power generators, hybrid dynamic filtering compensation devices, hybrid dynamic harmonic elimination compensation devices, intelligent dynamic reactive power compensation devices, harmonic protectors, etc. It is suitable for reactive power compensation, harmonic suppression, and comprehensive governance of electrical equipment in industrial, civil, and public buildings in new construction, renovation, expansion, and technological transformation projects. It can provide suitable design solutions according to the power quality problems of different industry types and load types, in order to improve power supply quality and ensure the safe and economic operation of the power system.

　　Application location:

　　(1) Commercial center/office building (air conditioning, elevator, thyristor dimming, etc.);

　　(2) Port terminals/chemical/metallurgical/shipbuilding/papermaking/coal mines (frequency converters, etc.);

　　(3) Communication/Medical/Commercial Center (UPS, Switching Power Supply, etc.);

　　(4) Photovoltaic/charging station/chemical/metallurgical (rectifier, etc.).

　　System functions

　　ANAPF active power filter

　　The ANAPF series active power filters are connected in parallel in low-voltage distribution systems with harmonic loads, and can quickly and real-time track and compensate for dynamically changing harmonic currents.

　　The ANAPF series active power filter collects harmonic currents through a CT acquisition system, quickly calculates and extracts the content of each harmonic current through a controller, generates harmonic current commands, generates compensation currents in the opposite direction to the amplitude of the harmonic current through power execution devices, and injects them into the power system to offset the harmonic currents generated by nonlinear loads.

Key words:

• ANAPF dynamic filtering compensation device