ANAPF wall mounted active power filter

Description :

　　Elevators, air conditioners, variable frequency water pumps, ventilation, lighting equipment, etc. in hospitals will all generate distortion harmonics. The extensive use of fluorescent lamps can cause significant harmonic currents, with the third harmonic being the highest. When multiple fluorescent lamps are connected to a three-phase four wire load, due to the fact that the third harmonic current belongs to the zero sequence harmonic current and the three-phase vector angles are consistent, the third harmonic current overlaps with the zero line, causing excessive neutral line current. Most hospitals use variable frequency air conditioning and fans, and frequency converters are typical harmonic sources that can generate a large amount of 5th and 7th harmonic pollution to the power grid.

　　The main harmonic sources, harmonic orders, and distortion rates of the hospital power distribution system are shown in Table 1. It can be seen that the harmonics generated by typical hospital equipment are mainly 3rd, 5th, and 7th order. It is these devices that generate harmonics during operation, which affects the power quality of the hospital, and the affected power in turn affects the normal use of the equipment.

　　The key technology of intelligent capacitor reactive power compensation for Ankerui ANAPF wall mounted active power filter

　　1) Adopting imported thyristors to control capacitors for contactless, impact free, and filter free switching, it also has the advantages of low loss, long component life, and maintenance free compared to ordinary compensation cabinets.

　　2) Avoid harmonic resonance and prevent harmonic amplification.

　　3) Quickly track system load reactive power changes and respond dynamically in real-time.

　　4) No impact during switching, achieving zero crossing triggering, fast switching speed, no mechanical contacts, and no arc reignition.

　　By overcoming the key technologies mentioned above, we have developed modern power electronic green energy-saving products, providing petrochemical enterprises with reliable, automated, intelligent energy-saving green products, achieving the goals of energy conservation, cost reduction, and environmental protection.

　　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.

　　ANSVC Low Voltage Reactive Power Compensation Device

　　The ANSVC low-voltage reactive power compensation device is suitable for automatic reactive power compensation in power grids with a frequency of 50Hz and a voltage of 0.4kV; It integrates reactive power compensation and power grid monitoring. It can not only compensate for reactive power losses in the power grid by switching capacitor banks, improve power factor, reduce line losses, but also enhance the load capacity and power supply quality of the power grid; At the same time, it can also monitor the three-phase voltage, current, power factor and other electrical parameters of the power grid in real time.

　　Discrete component solution

　　The discrete component capacitor compensation scheme consists of a power factor controller, low-voltage switching switch, series reactor, low-voltage power capacitor, etc. Based on the actual situation of the power grid, taking into account both the compensation effect and cost, choose a reasonable compensation form. Fully resolve the contradiction between compensating reactive power and three-phase imbalance, as well as between three-phase compensation and cost.

　　Intelligent capacitor solution

　　The AZC series intelligent capacitors are a new generation of reactive power compensation equipment for 0.4kV, 50Hz low-voltage distribution, which is efficient, energy-saving, reduces line loss, improves power factor and power quality. It consists of an intelligent measurement and control unit, a thyristor composite switch circuit, a line protection unit, and two (△ type) or one (Y-shaped) low-voltage power capacitors. By changing the bulky and cumbersome structural mode of traditional reactive power compensation devices, the new generation of low-voltage reactive power compensation equipment has the characteristics of better compensation effect, smaller size, lower power consumption, cheaper price, more cost savings, more flexible use, easier maintenance, longer service life, and higher reliability, adapting to the higher requirements of modern power grids for reactive power compensation.

　　ANSVG Static Reactive Power Generator

　　Static reactive power generator is a new type of power electronic device used to compensate for reactive power and imbalance. It can quickly and continuously compensate for varying reactive power and negative sequence. Its application can overcome the disadvantages of traditional reactive power compensators such as LC compensators, such as slow response speed, uncontrollable compensation effect, easy parallel resonance and switching oscillation with the power grid.

　　ANSVG-S-G Intelligent Dynamic Reactive Power Compensation Device

　　Intelligent dynamic reactive power compensation device is a new type of power electronic device used to compensate for reactive power, improve power factor, and achieve reactive power compensation effect; The intelligent control system actively adjusts the output of the module based on the linear dynamic requirements of the system; The ANSVG-S-G machine is mainly composed of the ANSVG-S-G module, intelligent controller, and LC module; Capable of compensating for larger capacity reactive power, the entire machine achieves human-machine interaction through a 7-inch touch screen. The touch screen communicates with the ANSVG-S-G module through RS485.

　　ANSVG-S-A series hybrid dynamic harmonic elimination compensation device

　　At present, based on the development of the industry and market demand, the ANSVG-S-A series hybrid dynamic harmonic elimination compensation device applies new technologies, combining the economic efficiency of SVC and the effectiveness of APF filtering, breaking through traditional reactive power compensation technology, and achieving harmonic control and reactive power compensation while effectively reducing costs.

　　The ANSVG-S-A series hybrid dynamic harmonic elimination compensation device is mainly used to compensate for reactive current, harmonic current, and unbalanced current in the power grid, in order to achieve the goals of improving power efficiency, energy conservation, and improving power quality.

　　ANSVG-G-A hybrid dynamic filtering compensation device

　　The hybrid dynamic filtering compensation device can not only compensate for reactive power but also manage system harmonics. The device is connected in parallel to the distribution system to monitor the current component of the system in real time. Through control calculations and logical changes, the required reactive and harmonic components of the system are calculated. Then, the power electronic converter generates the required reactive and harmonic currents in real time and injects them into the distribution system, achieving intelligent compensation and harmonic management.

　　Equipment selection

　　The main methods for improving the power quality of Ankerui ANAPF wall mounted active power filters are filtering and reactive power compensation, including the use of passive filters and active filters.

　　Passive filters filter by providing low impedance branches for harmonic generation. The problem with passive filters is that: (1) one parameter can only compensate for specific harmonic orders, and under certain conditions, it may resonate with a certain harmonic order, amplifying the harmonic and causing other accidents; (2) Slow response speed, unable to track dynamic harmonics and perform dynamic compensation; ⑶ Can only compensate for fixed reactive power; (4) When the system impedance is relatively small, its compensation effect is difficult to meet the requirements; (5) Changing the system impedance may cause resonance in the system; (6) The capacitance parameters are easy to change and have poor stability, which may lead to detuning. Active filter: emits harmonics with opposite phases and filters them through cancellation, which is the direction of future reactive power compensation.

　　The voltage provided by a normal power supply network should be a single fixed frequency and a specified voltage amplitude. The occurrence of harmonic current and harmonic voltage is a form of pollution to the power grid, which poses a threat to the normal operation of electrical equipment. The harm of harmonics generated by medical equipment to the power distribution system is mainly reflected in the following aspects:

　　Harmonics in the power grid can increase system losses, cause equipment to heat up, and affect the service life of the equipment. In addition, when the capacitance reactance Xcn of the parallel reactive power compensation capacitor matches the system inductance reactance Xsn, i.e. Xcn=Xsn, n parallel resonances will occur, causing overvoltage and overcurrent in the capacitor bank. When the fundamental frequency is f1, the resonant frequency fr can be calculated by the following equation. Among them, Sc is the short-circuit capacity of the power supply; Qc is the capacitance of the capacitor.

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