Partially Feedback Linearizing DC-Link Voltage Controller for Three-Phase Shunt Active Power Filters

In this paper, a novel partially feedback linearizing DC-link voltage control algorithm for shunt active power filters is presented. The nonlinear dynamic second-order voltage controller guarantees: a) asymptotic average DC-link voltage regulation; b) reconstruction of the current reference derivative; c) filtering properties of the DC-link voltage control loop with respect to the perturbations generated by the high-order active filter current harmonics. The modified current controllers provide harmonic distortions rejection, while voltage controller guarantees keeping the DC-link voltage in admissible range. The simulation study proofs theoretical findings.