Control strategy for a parallel active buffer circuit in a single-phase-inverter

Abstract

This paper presents a control strategy for a single-phase photovoltaic inverter, using a parallel active buffer circuit. The aim is to reduce the volume demand of the necessary capacitance for filtering the twice line frequency pulsating power. The pulsating power is stored in an additional buffer capacitor, which is decoupled from the input voltage by an active buffer circuit. Therefore a high voltage swing is possible. The control concept allows an independent operation of the parallel buffer circuit from the inverter circuit.