Ankerui ANAPF active power filter

Description :

　　Key Technologies for Active Power Filter Harmonic Control in Ankerui ANAPF Active Power Filter

　　The basic principle of an active power filter is shown in Figure 1. It detects the voltage and current of the compensation object, calculates the command signal of the compensation current through the command current operation circuit, amplifies the signal through the compensation current generation circuit, and obtains the compensation current. The compensation current is offset by the harmonic and reactive currents to be compensated in the load current to obtain the desired power supply current (in Figure 1, iL is the load current; ILf is the fundamental current; ILh is the harmonic current; I c is the compensation current; I S is the power supply current).

　　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

　　Analysis of Harmonic Generation in Ankerui ANAPF Active Power Filter

　　The harmonics in the power grid come from three aspects: firstly, the poor quality of the power generation source generates harmonics; The second is the generation of harmonics in the power transmission and distribution system; The third issue is the generation of harmonics by electrical equipment. Among them, there are more harmonics generated by electrical equipment.

　　The fundamental cause of harmonic generation is waveform distortion caused by the non-linear characteristics of certain equipment and loads in the power system, which result in a non-linear relationship between the applied voltage and current. The harmonic sources that cause waveform distortion are diverse, such as various nonlinear components, including high-capacity thyristor converters, silicon rectifiers, arc furnaces and other nonlinear loads, as well as numerous household appliances. In addition, asymmetric operation and faults in the power system, as well as the nonlinear characteristics of arcs, can all cause high-order harmonics. The main sources of harmonic pollution in the Tong'an area of Xiamen are the following power equipment:

　　Thyristor rectifier equipment. Due to the increasingly widespread application of thyristor rectification in many aspects such as electric locomotives, aluminum electrolysis cells, charging devices, and switching power supplies, it has caused a large amount of harmonics to the power grid. Variable frequency devices are commonly used in equipment such as fans, water pumps, elevators, etc. Due to the use of phase control, the harmonic components are very complex, containing not only integer harmonics but also fractional harmonics. The power of such devices is generally large, and with the development of variable frequency speed regulation, the harmonics injected into the power grid cannot be ignored. Electric arc furnace, calcium carbide furnace. Due to the difficulty of the three-phase electricity of the electric furnace simultaneously coming into contact with uneven furnace materials when heating raw materials, the combustion is unstable, causing three-phase load imbalance and generating harmonic currents, which are injected into the power grid through the triangular connection coil of the transformer. Rotating electric motor. The magnetic circuit of an AC electric motor is a closed loop composed of stator magnets, stator teeth, and air gaps. When the iron core is not saturated, it can be considered that the magnetic flux potential is concentrated in two air gaps. If the air gap is uniform, the magnetic flux potential will also be uniformly distributed along the surfaces of the stator and rotor instead of a sinusoidal distribution. Decomposing it can yield harmonic components, which will be generated by corresponding components in voltage and current.

　　Switch mode power supply (SMPS). Most modern electronic devices use switch mode power supplies, which are characterized by not being able to draw continuous current from the power grid, but can only draw pulse current, which contains a large number of 3rd and higher-order harmonic components.

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