Five-Level Full-Bridge Single-Phase Grid Connected Converter for Renewable Distributed Systems

Abstract

A single-phase grid-connected converter is usually adopted in low-power renewable systems. This paper deals with a novel five-level converter topology that follows this development.. The proposed converter architecture is based on a full-bridge topology with two additional power switches and two diodes connected to the midpoint of the dc link. Since the two added levels are attained by the discharge of the two capacitors of the dc link, the midpoint voltage is balanced and obtained with a specific pulse width modulation (PWM) strategy. This solution is designed for renewable energy systems, where unity power factor operations are generally required. Never the less, a variation of the proposed topology which allows four-quadrant operations.

Simulation of Photovoltaic System Connected With Full Bridge Inverter Using Matlab / Simulink

“…The full bridge converter can be used to generate two different PWM pulse trains depending on the switching scheme implemented. The two schemes are called bipolar and unipolar switching [6], [7], [13], [15], [22].…”

THD performance of single phase five level inverter using proportional resonant and harmonic compensators current controller

“…As an example, there are structures with two auxiliary switches and two anti-bidirectional diodes, with two other diodes through which the capacitors are discharged plus two DC voltage sources are combined together in addition to the single k cell structure [6][7][8][9][10]. In other structure, one additional switch, four diodes and either two DC sources or two capacitors across a boost converter are in used to realize the FLIs output voltages [8][9][10][11][12][13][14][15]. Because of the structures in the control circuit of five level inverters are complexed, few authors have presented on the control scheme [16][17][18][19][20][21][22][23][24], mostly on H-bridge inverters and FLI.…”