Abstract
In this paper, an enhanced H-Bridge multilevel inverter is proposed with the sinusoidal tracking algorithm. The proposed multilevel inverter (MLI) consists of two half H-Bridges cascaded with two unidirectional switches, n direct current (DC) sources, and (n-2) number of bi-directional switches together to form an enhanced H-Bridge (EHB) multilevel inverter. The output voltage levels of an EHB MLI depends on the number of DC sources, the number of bi-directional switches, and the relationship between the magnitude of left-side and right-side DC sources. With the addition of DC sources, bidirectional switches, and employing the sinusoidal tracking algorithm, the performance of the inverter is enhanced with features like an increased number of levels and a reduction in the total harmonic distortion and switching losses. In all the modes of operation of the proposed inverter, only three switches are “ON”, so that conduction losses are less. The proposed enhanced H-Bridge MLI is simulated using MATLAB/Simulink R2017a, and is verified with the experimental result.
Highlights
In recent years, multilevel inverters have become popular because of their competence for carrying high power, high voltage, good power quality, lower order harmonics, lower switching losses, and lower electromagnetic interference, due to the absence of an inductor and a capacitor [1,2,3].Multilevel inverters generate close to sinusoidal voltages, as in the form of a stepped voltage waveform, using many direct current (DC) voltage sources
cascaded H-Bridge (CHB) inverters can increase the number of output voltage levels by increasing the number of H-Bridges used, which increases the number of switching devices used; this makes a multilevel inverter more complicated
The equations for the number of uni-directional switches (NUni ), number of bi-directional switches (NBi ), number of dc voltage sources (NDC ), maximum magnitude of the generated output voltage (V O,Max ), and the minimum magnitude of the generated output voltage (VO,Min ) are the same for the symmetrical structure enhanced H-Bridge (SSEHB) topology represented in Equations (11)–(15), respectively
Summary
Multilevel inverters have become popular because of their competence for carrying high power, high voltage, good power quality, lower order harmonics, lower switching losses, and lower electromagnetic interference, due to the absence of an inductor and a capacitor [1,2,3]. Series connections of sub-multilevel, half-bridge symmetrical and asymmetrical inverters generate 13 and 31 levels, respectively, when cascaded to an H-Bridge inverter, in this topology six switches are “ON” in all the modes of operation [17,18]. To enhance the performance of the base unit and to reduce the THD, a choice of bidirectional switches and DC sources on both sides with two different methods and a sinusoidal tracking algorithm is proposed, with simulated and experimental results. This EHB MLI is suitable for medium-voltage applications and used in v/f control drives
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