Study of VCCS used in harmonics compensation device
 
LI Wei-guo， CHEN Long-dao
（College of Electrical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： In order to improve the power quality， a low-power system for harmonics compensation was proposed. The new equipment used a voltage controlled current source（VCCS） as the primary converter circuit. It made harmonic suppression by amplifying and reversing the harmonics signal acquired by the DSP，then feeding it back to the power grid. The structure and the principle of the system were introduced briefly while the DC，AC and the temperature characteristics of the VCCS were analyzed comprehensively. Simulation result with Matlab and Multisim demonstrates the advantages of the new system：it efficiently eliminates the nonlinearity inherited in the power electronic device used for power filter. Also its moderate stability and outstanding time-frequency response characteristic make it have a wide application in harmonic compensation with low-power.
Key words： operational amplifier；voltage-controlled current source（VCCS）；harmonics compensation