Active Power Filter

Active Power Filter.

 

Traditional AC - DC (AC-DC) converter put into operation, the grid will be injected into a large number of harmonic currents cause harmonic loss and interference, network devices and also appeared the phenomenon of deterioration of power factor, the so-called "power pollution ", for example, not controlled rectifier plus capacitor filter, the network side of the third harmonic content of up to (70 ~ 80)%, the net side of the power factor of only 0.5 to 0.6.

 

Active Power Filter is a new type of harmonic suppression to dynamic power electronic devices, can overcome the shortcomings of traditional LC filter, is a promising means of harmonic suppression.Filter from the bridge switching power converters and specific control circuit.

 

The difference with the traditional switching power supply is:

 

(l) not only the feedback output voltage, but also the average current feedback input;

 

(2) current loop reference signal for the voltage loop error signal and full wave rectified voltage signal is the product of sampling.