Active Power Decoupling by Closed-loop Control of Power Oscillations for a Bidirectional Single-Phase DC-AC Converter

FANTINO, ROBERTO; BUSADA, CLAUDIO; SOLSONA, JORGE

IEEE TRANSACTIONS ON POWER ELECTRONICS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Año: 2023 p. 1 - 9

0885-8993

A control strategy for the active power decoupling in a single-phase full-bridge-based bidirectional dc-ac converter is proposed in this work. An ac-side auxiliary-circuit three-leg topology is used for the implementation. The proposal makes use of the instantaneous power theory for three-phase systems, applied to single-phase systems. A closed-loop control in the power domain is implemented, by matching the instantaneous power oscillations in the main-circuit of the converter connected to the grid, with the instantaneous power oscillations in the auxiliary-circuit. The control loop does not employ the measurement of the voltage or current on the dc-bus, nor the voltage on the auxiliary-circuit capacitor. Not requiring a calculation for the voltage reference on the auxiliary-circuit capacitor depending on the circuit parameters, allows to eliminate the second harmonic power oscillations on the dc-bus even in the presence of parametric uncertainty. Experimental and simulation results are presented to demonstrate the validity and effectiveness of the proposal.