DEVELOPMENT OF CONTROL SYSTEM OF SINGLE-PHASE ACTIVE FILTER BASED ON DC LINK VOLTAGE MONITORING
The article describes the operation of a single-phase active filter with controls system based on voltage monitoring of the capacitor in the DC link. The voltage value is controlled by changing the amplitude of the idealized sinusoidal current formed by the active filter. The calculation of the required current amplitude is implemented on the basis of a PI controller, the parameters of which are formed experimentally. A simulation model of a single-phase nonlinear electric load and an active filter in the Matlab Simulink has been developed. As a result of the simulation, it was found that the total harmonic current distortion decreased from 76 % to 0.73 %, and the transition time of changing the voltage of the DC link and over-regulation were 0.2 s and 0.01 %, respectively.