The Usage of APF Low Voltage Active Power Filter Device

APF is a new harmonic control device based on IGBT inverter. By detecting the load current waveform in real time, the fundamental wave (50Hz) component in the waveform is removed, and the remaining waveform is reversed. By controlling the triggering of the IGBT, the reverse current is injected into the power supply system to filter (offset) harmonics and dynamic It has functions such as compensating system reactive power and voltage fluctuations, suppressing resonance, and improving power factor, thereby achieving the purpose of improving the safety of the power supply system, saving energy, and reducing consumption.

Active Power Filter (APF)

-PF=0.99 THDi<5%

-2~50th harmonic compensation

-Capacitive reactive power compensation

-Three-phase unbalance compensation

Jiachen active power filter GAPF has a single unit capacity of 30~750A. Its application scope includes hospitals, schools, venues, amusement facilities, petroleum, chemical industry, coal mines, textiles, electric power, automobiles, electronics, transportation, buildings, manufacturing, metallurgy, and ports. Power quality management in other industries.

Performance characteristics

■ APF can filter out 2-50 harmonics at the same time, or choose to filter out specific harmonics;

■ Inductive and capacitive reactive power compensation, the power factor can reach 0.99;

■ Three-phase active power unbalance compensation, three-phase reactive power unbalance compensation, split-phase compensation

■ Three-level design, excellent EMC characteristics;

■ The device will never over-current, and at the same time of filtering, over-compensation can be completely avoided;

■ Comprehensive fault protection functions (overvoltage, undervoltage, overcurrent, short-circuit protection, etc.);

■Imported IGBT, stable and reliable

■ The full response time is less than 10ms, and the complete harmonic compensation time for step changes is <5ms;

■ Modular design, flexible combination with TSC or SVG, mixed compensation

■ Suitable for wall-mounting, whole cabinet, or user-designed cabinet assembly and other installation methods;

■ Friendly human-machine interface allows real-time understanding of system parameters and equipment operating status;

■ Multiple cabinets can be operated in parallel, with guaranteed availability and online capacity expansion.

Single machine intelligently sets multiple application modes

Full capacity APF mode

Fully compensates harmonics from 2nd to 50th harmonics, and can also compensate specific harmonics individually.

The response speed is extremely fast, ≤10ms.

The harmonic filtering rate is high. Under rated power, the harmonic current filtering rate can be as high as 98%.

APF mode + SVG mode

According to the real-time working conditions of the power grid, harmonic control and reactive power compensation capacity are intelligently allocated, and a single machine simultaneously performs harmonic control and dynamic reactive power compensation to ensure high-quality electric energy.

Achieve diversified control of power quality targets.

GAPF mode + TSC reactive power compensation module

It has a comprehensive compensation effect for both harmonic sources and reactive impact loads.

Hybrid compensation: TSC realizes reactive power compensation while suppressing characteristic sub-harmonic currents.

The voltage and current of the compensation object are detected in real time, and the compensation current command signal is calculated by the command current calculation unit. The signal is amplified by the compensation current generation circuit to generate a compensation current. The compensation current and load current need to be compensated for harmonics and reactive currents. offset, and finally get the desired supply current. What is reflected in the figure below is that when the harmonic current generated by the load needs to be compensated, the active power filter detects the harmonic component ih in the load current iL to be compensated, and uses its reverse polarity as the command signal for the compensation current. iC*, and then the compensation current generating circuit generates the compensation current ic. The compensation current ic is equal to the harmonic component iLh in the load current and has opposite directions. Therefore, the two cancel each other out, so that the power supply current only contains the fundamental wave, thus eliminating the power supply. Purpose of harmonics in current.

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