Abstract
This paper presents a test of a new three-phase multilevel inverter for PV system applications with reduced number of used DC sources and power switches. The topology of the inverter is designed using an electric assemblage of a two-level dc-dc boost converter (TLBC) with a simplified three-phase multilevel DC-AC converter (THPMC). The TLBC generates two balanced output DC voltages, while the THPMC converts these two DC voltages and generates three-phase AC voltages with five levels per line. Two modulation control techniques are used and tested with the proposed PV system on PSIM and on ISIS Proteus software. The achieved results prove the simplicity and efficiency of the proposed three-phase inverter.
Highlights
Multilevel inverters offer the possibility of increasing the efficiency of the PV energy conversion chain
The proposed PV system is tested on PSIM software with high switching frequency modulation technique and on ISIS Proteus software with a fundamental switching method programmed on a model of a low-cost microcontroller
It’s used to step-up the input voltage Vin in order to deliver two balanced output voltages (Vdc and 2Vdc) [14, 15]. This multilevel DC-AC converter is easy to tie with batteries, solar panels, and DC-DC converters, because all used DC voltage sources have a common line to the ground (GND)
Summary
Multilevel inverters offer the possibility of increasing the efficiency of the PV energy conversion chain They deliver optimal AC voltages and currents with fewer harmonics (low THD), reduce voltage transients across industrial machines windings, present low electromagnetic interference, make low switching losses across power switches, and use small filters [1,2,3,4]. Their basic structures are arranged in three categories: neutral point clamped inverter, cascaded H-bridge inverter, and flying capacitor. The proposed PV system is tested on PSIM software with high switching frequency modulation technique and on ISIS Proteus software with a fundamental switching method programmed on a model of a low-cost microcontroller
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