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Abstract
Different types of multilevel converters have been used to convert DC voltage to AC voltage for different applications. It is, however, desirable for flexible AC output voltage to be created from a single DC source at lower cost. This paper presents a new type of single DC source multilevel inverter which has the ability to create a different number of levels with low rate components. This device is also able boost the magnitude of the output voltage by means of a variable gain with one DC source. The advantages of the multilevel inverter are rapid stepping among levels, and its ability to produce different ranges of levels (seven, nine and eleven) and gains (two, four and eight). The proposed multilevel inverter includes six semiconductor switches, eight diodes, two capacitors and two inductors, making it suitable for low-power applications. A simulation in MATLAB and experimental tests on a prototype setup showed good performance for different modulations, with THD% down to 2.29%, which are meets the IEEE standard (IEEE 519).
Highlights
Multilevel inverters (MLIs) have been used in various applications as voltage source converters (VSC) to connect DC power systems to AC power systems
MLIs include an array of semiconductors and DC sources to generate different output voltage levels with high quality waveforms
Multilevel inverters are classified into three well-known topologies that have been used in various industries: Neutral Point Clamped (NPC) [10], Flying
Summary
Multilevel inverters (MLIs) have been used in various applications as voltage source converters (VSC) to connect DC power systems to AC power systems. The module has a simple circuit and control strategy, and the stress on the switches is low compared with conventional CHBs. On the other hand, a large number of cascade connections to generate higher output voltage levels can increase the complexity and construction cost. In some modules that use a single source to generate output levels, the number of semiconductors increased, and the charging/discharging of capacitors and switch driving become complicated [31,33]. A flexible multilevel inverter for one DC source is proposed which can create a different number of levels and voltages at the output for low-power applications. The proposed multilevel inverter has the ability to create up to 11 levels and boost the output voltage up to 8 times compared to the DC source.
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