Wanlida active harmonic filter 25A~750A

Wanlida active harmonic filter 25A~750A

APF Technical Principle

Active power 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 power filter (APF/AHF), where, V_s is AC power supply, nonlinear load is harmonic source, it generates harmonic and consumes reactive power. APF 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. 

APF Technical Features

• Can filter all kinds of harmonic currents
• Filtering capability >95% for aimed harmonic
• Traction level IGBT module, 20KHz switching frequency    
• Response time <10ms
• Single capacity up to 300A
• Suppress three-phase unbalance
• Conform to IEEE Std. 519-1992, GB/T 14549
• Can be used as harmonic source
• Apply closed-loop control, and ensure filtering accuracy
• Can set filtering mode and select harmonic filtering type
• Adapt automatically to impedance change of power network
• Can connect 690V system(CE/C-tick) and 600V system(cUL) directly
• Parallel connection, easy for filtering capacity expansion
• Modularized design, easy for maintenance
• Perfect protection functions
• Faults record and history inquire
• Support multiple communication protocols 

 Technical Parameters

Factory Acceptance Test Platform

We built the first-class active power filter test platform to realize Factory Acceptance Testing for whole machine before delivery. 

Model and Dimension  

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