Developed cascaded multilevel inverter topology to minimise the number of circuit devices and voltage stresses of switches

Abstract

In this study, a novel structure for cascade multilevel inverter is presented. The proposed inverter can generate all possible DC voltage levels with the value of positive and negative. The proposed structure results in reduction of switches number, relevant gate driver circuits and also the installation area and inverter cost. The suggested inverter can be used as symmetric and asymmetric structures. Comparing the peak inverse voltage and losses of the proposed inverter with conventional multilevel inverters show the superiority of the proposed converter. The operation and good performance of the proposed multilevel inverter have been verified by the simulation results of a single-phase nine-level symmetric and 17-level asymmetric multilevel inverter and experimental results of a nine-level and 17-level inverters. Simulation and experimental results confirmed the validity and effectiveness performance of the proposed inverter.

A Modified Switched-Diode Topology for Cascaded Multilevel Inverters

“…4(e) shows the PIV of the proposed inverter which is nearer to [31], [22]. However the topologies in [14]- [16] are the best since they are specially designed to reduce the PIV as a compromise against a larger number of IGBTs than the proposed topology. By changing the modulation index 'm' the level count 'L' is changed and as a result, the %THD and the switching loss are also changed.…”

“…The basic unit uses a switch surrounded by four diode bidirectional configurations and these basic units are cascaded [13]. The basic unit is reconstructed in a cross connected manner so as to reduce the voltage stress [14]- [16].…”

Modelling and Simulation of Single Phase Multilevel Inverter with Minimum Power Devices and DC Sources

“…A preferred output voltage waveform can be symphonized from the multiple voltage levels with low bias, low switching frequency, higher competence, and lower voltage devices.Yet, it requires a huge quantity of circuit modules[1]- [5].In conservative multilevel inverters, a cascaded H-bridge multilevel inverter (CHB) is the solitary preferred choice to upsurge the amount of output voltage levels. However, the H-bridge cells by increasing the CHB, and it also increases power electronic devices [6]- [7]. The superlative elucidations to generate the highest yield of voltage stages by minimize the quantity of circuit apparatuses in a CHB is to use asymmetrical dc voltage [8]- [9].…”

A Cascaded Modular Multilevel Inverter Topology Using Novel Series Basic Units with a Reduced Number of Power Electronic Elements

“…In the field of industrial power electronic utilities, multilevel voltage source inverters (MLVSIs) offer the promising potential for use in medium and high power applications due to their various salient features such as low voltage stresses on switches, low total harmonic distortion (THD) of the output waveforms, no need for large output filters or transformers, and low cost [1]- [10].…”

“…These are the diode clamp MLVSIs [5], flying capacitor MLVSIs [6]- [8] and cascaded H-bridge MLVSIs [9], [10]. However, these conventional types always suffer from requiring a large number of power electronic components, isolated dc voltage sources and charge balancing control procedures which can increase the overall operating and maintenance costs.…”