Abstract:
A mathematical model in the stationary reference frame is used to offer a new discrete-time control method for three-phase three-wire shunt active power filters (APFs). A feedback-linearization-type approach controls filter currents by decoupling the voltage control loop from the current control.
A proportional-integral (PI) controller generates the reference amplitude for the corrected grid currents in the voltage control loop, which controls the pulsewidth modulation (PWM) converter’s dc-side voltage.
The suggested control technique compensates for the microcontroller computation-induced one-sampling-period delay using a finite impulse response (FIR) predictor. This predictor predicts the PWM converter’s switching function space vector, the control variable, one step ahead.
Additionally, the FIR predictor is tailored to forecast control variable low-order harmonics with lowest error. For stability, the steady-state filter current error and PI controller gain ranges are calculated from the proposed control method. Simulation and experimental data demonstrate the shunt APF’s efficacy.
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