ANAPF: Active Power Filter

The ideal voltage and current waveforms in the power system are sine waves with a frequency of 50 Hz, however, the wide-ranging applications of nonlinear power equipment (such as high-power thyristors, inverters, UPS, switching power supplies, intermediate frequency furnaces, energy-saving lamps, etc.) generates a large amount of distorted harmonic current. Harmonic current coupling will generate harmonic voltage on the line. The Fourier series decomposition is performed on the non-sinusoidal distortion current, wherein the component whose frequency is the same as the power frequency is the fundamental wave, and the component whose frequency is an integer multiple of the fundamental frequency is the harmonic. This type of harmonic "pollution" could cause great harm to the power grid and users, so harmonic management is called as a "green project."

Due to the development of power electronics technology, active power filter (APF) began to scale application. Compared with the traditional harmonic suppression and reactive power compensation device, APF has a fast response, could real-time tracking and compensation for each harmonic, and has the functions of compensating for harmonics, reactive power compensation and balancing three-phase current. At the same time, APF has the advantages of not being affected by system impedance, no hidden danger of resonance, high compensation efficiency, and has been widely used in power supply systems of various industries.

Function

Flexible compensation method:Compensate for harmonics only, compensate for reactive power only, compensate for both harmonics and reactive power,could compensate for 2th-25th harmonics or compensate for specific harmonics;

Ability of managing three-phase imbalance;

Linear compensation,Response time ≤ 5ms;

Humanized human-computer interaction interface, which displays real-time power quality information of the system and the ontology. This interface has the ability to control the device remotely and easy to operate;

Adopt imported IGBT which has high power density and high reliability;

Using DSP digital control system for high speed detection and calculation;

With remote communication interface, real-time monitoring through PC;

Standard modular design which reduces lead times and increases reliability and maintainability.

Response time

Full response time≤5ms,Instantaneous response time≤100μs

Total harmonic compensation rate

≥ 97%,3th/5th/7th/9th independent compensation rate ≥ 98%

Self-loss

≤2%

Efficiency

≥98%

Switching frequency

20KHz

Technical Parameters

Interface

Main interface

System information interface

Fault information interface

Parameter setting interface

Wiring

Typical Connection