Wanlida harmonic filter can dynamically filter harmonic with variable amplitude and frequency and compensate reactive power.

Technical Principle

Active harmonic filter (APF/AHF) is new power electronic equipment which can dynamically filter harmonic with variable amplitude and frequency and compensate reactive power, it overcome the shortages of conventional LC filter and obtained the better compensation performances than passive filter.

The right diagram is schematic diagram of active harmonic filter (APF/AHF), where, Vs is AC power supply, nonlinear load is harmonic source, it generates harmonic and consumes reactive power. AHF system is composed of instruction current operational circuit and compensation current generation circuit, the instruction current operational circuit is mainly to detect current components in harmonic current and reactive power of compensation object, and the compensation current generation circuit generates equivalent compensation current with same amplitude and inverse polarity with harmonic current to filter harmonics according to instruction signal, the main circuit adopts PWM converter. 

  

AHF Functions

Reduce harmonic distortionImprove power factorReduce line lossPrevent neutral line from overheatPrevent power equipments from noise, overheat and vibration like motor, transformer etc.Prevent signal transmission equipments from data loss and interferencePrevent measurement error caused by non-sinusoidal current and voltage.Prevent sensitive semi-conductive device from damagePrevent circuit breaker trip.Prevent capacitors from burn due to harmonic resonanceEnsure safety of power system and reduce energy consumption

AHF Technical Features

Can filter all kinds of harmonic currentsFiltering capability >95% for aimed harmonicTraction level IGBT module, 20KHz switching frequency     Response time <10msSingle capacity up to 400ASuppress three-phase unbalanceConform to IEEE Std. 519-1992, GB/T 14549Can be used as harmonic sourceApply closed-loop control, and ensure filtering accuracy Can set filtering mode and select harmonic filtering typeAdapt automatically to impedance change of power network Can connect 690V system(CE/C-tick) and 600V system(cUL) directlyParallel connection, easy for filtering capacity expansionModularized design, easy for maintenancePerfect protection functionsFaults record and history inquireSupport multiple communication protocols

Technical Parameters

SN	Parameters	Value
1	Power Supply Voltage(kV)	0.4/0.69kV (±15%)
2	Power Supply Frequency (Hz)	50/60Hz
3	Power Supply Mode	Three-phase three wires or three-phase four wires
4	Harmonic Compensation Components	2~50
5	Response Time (ms)	<10ms
6	Output Current(A)	25~750A
7	Protection Mode	Over current, overheat, phase loss, Error-phase, DC busbar over/under voltage, Current limit for overload etc
8	Loss	<5%
9	Operation Display	Touch screen
10	Operation Environment	-100C~+450C
11	Altitude	<1000m
12	Relative Humidity	<90% (250C)
13	Noise	<70Db
14	Compensation capability	All within compensation capacity
15	Compensation Mode	Harmonic compensation, reactive power compensation or Both
16	Switching Frequency	20kHz
17	Cooling Mode	Forced air cooling
18	IP	IP20
19	Color	RAL7032
20	Feed Direction	Top/Bottom
21	Communication	RS485/RS232

Factory Acceptance Test Platform

 

We built the first-class high voltage and big capacity harmonic filter test platform to realize Factory Acceptance Testing for whole machine before delivery.  

Model and Dimension specification

 

Model	Output current(A)	Dimension(W×D×H)mm
WLD-APF-0.4-75-3L WLD-APF-0.4-75-4L	75	800×600×2200
WLD-APF-0.4-150-3L WLD-APF-0.4-150-4L	150	800×800×2200
WLD-APF-0.4-225-3L WLD-APF-0.4-225-4L	225	800×800×2200
WLD-APF-0.4-300-3L WLD-APF-0.4-300-4L	300	1200×1000×2200
WLD-APF-0.4-375-3L WLD-APF-0.4-375-4L	375	1600×800×2200
WLD-APF-0.4-450-3L WLD-APF-0.4-450-4L	450	1600×800×2200
WLD-APF-0.4-525-3L WLD-APF-0.4-525-4L	525	1600×800×2200
WLD-APF-0.4-600-3L WLD-APF-0.4-600-4L	600	2400×1000×2200
WLD-APF-0.4-675-3L WLD-APF-0.4-675-4L	675	2400×1000×2200
WLD-APF-0.4-750-3L WLD-APF-0.4-750-4L	750	2400×1000×2200

The above dimension is our standard cabinet for 400V APF (Active power filter) and the wall-mounted cabinet or other voltage level AHF can be designed according to requirements of users.

Wanlida Harmonic Filter/50A~600A