Active Harmonic Filter 15A AHF Active Power Filter APF Power Quality Management Filter

Working Principle

The working principle of the STD APF series active power filter is to detect the load current in real time, separate the harmonic currents one by one based on the specified harmonic current detection algorithm, and generate and control the driver IGBT output and load harmonic current according to the set filtering percentage. Compensation currents with the same amplitude and opposite phases achieve the purpose of harmonic cancellation.

Products Description

Compact High Performance

Wall mount or cabinet mount in an ultra-compact design
Modular design, convenient multi-module parallel, small footprint, easy maintenance
Independent air duct and independent plate bin structure design to ensure the stable operation of equipment.

Optimal Harmonic Mitigation

Harmonic compensation rate >92%
Selection of odd and even harmonics up to the 50th order
High efficiency >97%
Reaction time <100us Response time of <10ms

Protect Your System From Resonance

The current spectrum is analysed at 1024 individual points per cycle
System impedance at each individual harmonic is effectively 'learnt' by the AHF
Compensation current is slowly increased with system stability closely monitored
Should resonance be detected at any point the intelligent FFT can skip the problematic point

Balance Your Loads And Correct Your Power Factor Too

In addition to harmonic mitigation the AHF can provide load current balancing
Reactive power can be compensated for thus increasing power factor

Project Case

Manufacturing Shop

Product Parameters

TYPE	Series 220V	Series 400V	Series 500V	Series 690V
Max neutral wire current	23A	15A, 25A, 50A, 75A, 100A, 150A	100A	100A
Nominal voltage	AC220V(-20%~+20%)	AC380V(-20%~+20%)	AC500V(-20%~+20%)	AC690V(-20%~+20%)
Rated frequency	50Hz±5%
Network	Single phase	Three-phase three-wire / Three-phase four-wire
Response time	<40ms
Harmonics filtering	2th to 50th Harmonics, The number of compensation can be selected, and the range of single compensation can be adjusted
Harmonic compensation rate	>92%
Neutral line filtering capability	/	The filtering capacity of three-phase four-wire neutral line is 3 times of that of phase filtering
Machine efficiency	>97%
Switching frequency	32kHz	16kHz	12.8kHz	12.8kHz
Feature selection	Deal with harmonics / Deal with harmonics and reactive power	Deal with harmonics / Deal with harmonics and reactive power / Deal with harmonics and three-phase unbalance / Three options
Numbers in parallel	No limitation. A single centralized monitoring module can be equipped with up to 8 power modules
Communication methods	Two-channel RS485 communication interface (support GPRS/WIFI wireless communication)
Altitude without derating	<2000m
Temperature	-20~+50°C
Humidity	<90% RH, The average monthly minimum temperature is 25°C without condensation on the surface
Pollution level	Below level III
Protection function	Overload protection, hardware over-current protection, over-voltage protection, power failure protection, over-temperature protection, frequency anomaly protection, short circuit protection, etc
Noise	<50dB	<60dB	<65dB
Installation	Rack / Wall hanging		Rack
Into the way of line	Back entry (rack type), top entry (wall-mounted)		Top entry
Protection grade	IP20

Product Packing

Frequently Asked Questions

What is the working principle of the STD APF active power filter?

It real-time monitors the load current, extracts the harmonic components using an advanced detection algorithm, and drives the IGBT output to generate a compensation current of equal magnitude and opposite phase, successfully canceling out the harmonics.

Which harmonics can the STD APF series effectively mitigate?

The series provides selective mitigation of odd and even harmonics from the 2nd up to the 50th order, achieving a total harmonic compensation rate exceeding 92%.

Can the system handle load balancing and power factor correction?

Yes. In addition to high-efficiency harmonic mitigation, the APF series balances load currents and compensates for reactive power, significantly improving the system's overall power factor.

Does the APF series support parallel operations for larger loads?

Yes, there is no limitation on parallel connection. A single centralized monitoring module can easily manage up to 8 parallel power modules.

How does the unit prevent system resonance?

The APF analyzes the current spectrum at 1024 points per cycle and 'learns' system impedance. If potential resonance is detected at any harmonic point, the intelligent FFT will bypass the problematic frequency to safeguard the system.

What installation configurations are available?

For 220V and 400V series, both rack and wall-mounted installations are supported. For 500V and 690V series, standard rack installation is utilized.

Product Detail

Active Harmonic Filter 15A AHF Active Power Filter APF Power Quality Management Filter

Product Description

Working Principle