A new single-phase PV fed five-level inverter topology connected to the grid

Abstract

There is a strong trend in the photovoltaic (PV) inverter technology to use transformerless topologies in order to acquire higher efficiencies. This paper presents a singlephase five-level grid connected PV inverter with a novel dual reference modulation technique. Two reference signals identical to each other with an offset equivalent to the amplitude of the rectified inverted sine carrier signal were used to generate PWM signals. The inverter consists of a fullbridge inverter and an auxiliary circuit comprising four diodes and a switch. The inverter produces output voltage in five levels: zero, +1/2V dc , V dc , -1/2V dc and -V dc . The validity of the proposed inverter is verified through simulation.

Performance Investigation of Asymmetric Multilevel Inverter with Reduced Switch Count for Fuel Cells

“…By using constant frequency carriers, the number of switching of the upper and lower switches is higher than the intermediate switches. Figure arrangements of VF POD [4][5][6]. of the carrier is increased properly to balance the number of switching for all the switches.…”

Randomized Integral Gain of Pi Current Controller for A Single Pv Inverter System

“…To improve the harmonic performance of grid connected inverter systems, it is possible to make improvements to the power electronic converter hardware; inverter topology [7,8], PWM switching schemes [9][10][11], and so on. Alternatively, it is possible to enhance the performance and robustness of the current controller [1,[12][13][14].…”