Abstract
This multilevel inverter type summarizes an output voltage of medium voltage based on a series connection of power cells employing standard configurations of low-voltage components. The main problems of cascaded switched-capacitor multilevel inverters (CSCMLIs) are the harmful reverse flowing current of inductive loads, the large number of switches, and the surge current of the capacitors. As the number of switches increases, the reliability of the inverter decreases. To address these issues, a new CSCMLI is proposed using two modules containing asymmetric DC sources to generate 13 levels. The main novelty of the proposed configuration is the reduction of the number of switches while increasing the maximum output voltage. Despite the many similarities, the presented topology differs from similar topologies. Compared to similar structures, the direction of some switches is reversed, leading to a change in the direction of current flow. By incorporating the lowest number of semiconductors, it was demonstrated that the proposed inverter has the lowest cost function among similar inverters. The role of switched-capacitor inrush current in the selection of switch, diode, and DC source for inverter operation in medium and high voltage applications is presented. The inverter performance to supply the inductive loads is clarified. Comparison of the simulation and experimental results validates the effectiveness of the proposed inverter topology, showing promising potentials in photovoltaic, buildings, and domestic applications. A video demonstrating the experimental test, and all manufacturing data are attached.
Highlights
A. motivation and incitementNowadays, multi-level inverters (MLI) play a leading role in various industries
In this paper, a new type of MLI topology with switched capacitors is introduced, containing fewer switches but providing the same response compared to similar inverters with two isolated DC sources
Eliminating the harmful reverse flowing currents associated with inductive loads was the purpose of the switch eliminated from the topology
Summary
Multi-level inverters (MLI) play a leading role in various industries. The application of multi-level inverters has increased, especially in the grid connection of renewable energy systems. The main problem with two-level square-wave and PWM inverters is their employment in high and medium power systems. A reasonable alternative to these types of converters (in this power range) can be MLIs. Neutral point diode clamped (NPDC), flying capacitors (FC), and cascades H-bridge (CHB) are the main types of multi-level inverters [1]. Voltage source inverters are widely used in electric motor drives and high-power quality applications. One problem with switched capacitors in multi-level inverters is the inherent unbalance of the capacitor voltage [2]. The number of switches is reduced by using this type of inverter [3]. The proposed MLI has the privilege of using fewer semiconductors and capacitors with lower voltage ratings for the step-up multi-level AC output
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