Active Power Filter

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Active power filter Active power filter High frequency magnetic rings electric reactor American DSP chip

Active power filter is shunt connected to the power grid, with the help of high accuracy sampling CT technique, it can monitor load current in real-time and transfer the current into signal that can be read by digital processor. By the calculation of PWM modulation mode, the power module of active power filter will output the equal size current of harmonic with contrary phase aiming to eliminating harmonics in power grid.

Application
The active power filter has a widespread use in electrical equipment. For example, all kinds of frequency conversion equipment, electrical arc furnace, rolling mill, nonferrous metallurgical equipment, harbor machinery, electric welding machine, chemical machinery, rectifier equipment of rectifier transformer, medium frequency furnaces, variable frequency air-condition, elevator, uninterruptible power system, switching power supply, energy-efficient lighting equipment, etc.

Technical Parameter

Wiring mode

Three phase three line

Three phase four line

Compensation current of each cabinet

100A

150A

200A

250A

300A

350A

400A

450A

500A

100A

150A

200A

250A

External dimension (L*W*H) mm

600*800*2200 800*800*2200 800*1000*2200

800*1000*2200 1000*1000*2200

600*800*2200 800*800*2200 800*1000*2200

voltage

400/690V

Time of filter harmonic frequency

2-50 times (eliminate all or selected number of harmonics)

Filter harmonic degree setting

Under the rated capacity, the maximum degree of elimination of harmonics

Harmonic current distortion rate

≦5%

Total response time

≦1ms

Compensation way

Harmonic compensation, reactive compensation, or harmonic reactive with filling

Switch frequency

20KHz

Parallel operation ability

N set in parallel，professional advice up to 10 set.

Effective power loss

Cooling mode

Force-air cooling

Noisy

≦65dB(A)

IP grade

Ip20(higher protection level can be customized)

Color

Shallow camera gray(other colors can be provided as required according to RAL)

I-direction

Aspirant line / down line

Ambient temperature

-25℃～45℃

Condition

Indoor installation, it is recommended to install an altitude of not more than 2400m. (higher altitude to be reduce capacity to use)

Display functions (user interface)

Frequency, power factor, voltage and current value, total current distortion rate, frequency spectrum, current waveform, total load current value, output current value, operation mode setting, dry node settings, fault information and operation time

Protection mode

Input under-voltage, lacking input phase, over-current, overheating, DC bus under voltage, overload automatic current limit protection

Our active power filter can be customized with the requirement of customers.

Feature
1. Our active power filter has a shorter dynamic response time less than 1ms and transient response time less than 100μs.
2. Based on the design of software and hardware protection system, power will automatically be cut off when device fails.
3. The compensatory capacity of active power filter is commonly limited by IGBT power module, which cannot be used for compensation of high capacity harmonics. Our APF equipment supports parallel connection of several cabinets, which is easy to solve the problem of high capacity harmonics compensation.
4. The control circuit adopts double loop control mode with a current inner ring and the outer ring of voltage to realize voltage regulation and current limit.
5. The installation of active power filter is simple and the equipment can normal operate just after shunt connected to power grid. The internal structure is also simple and clear and the equipment adopts modular design, which is very convenient to install and maintain later.

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