Performance Analysis of a Novel Reduced Switch Cascaded Multilevel Inverter

Abstract

Multilevel inverters have been widely used for high-voltage and high-power applications. Their performance is greatly superior to that of conventional two-level inverters due to their reduced total harmonic distortion (THD), lower switch ratings, lower electromagnetic interference, and higher dc link voltages. However, they have some disadvantages such as an increased number of components, a complex pulse width modulation control method, and a voltage-balancing problem. In this paper, a novel nine-level reduced switch cascaded multilevel inverter based on a multilevel DC link (MLDCL) inverter topology with reduced switching components is proposed to improve the multilevel inverter performance by compensating the above mentioned disadvantages. This topology requires fewer components when compared to diode clamped, flying capacitor and cascaded inverters and it requires fewer carrier signals and gate drives. Therefore, the overall cost and circuit complexity are greatly reduced. This paper presents modulation methods by a novel reference and multicarrier based PWM schemes for reduced switch cascaded multilevel inverters (RSCMLI). It also compares the performance of the proposed scheme with that of conventional cascaded multilevel inverters (CCMLI). Simulation results from MATLAB/SIMULINK are presented to verify the performance of the nine-level RSCMLI. Finally, a prototype of the nine-level RSCMLI topology is built and tested to show the performance of the inverter through experimental results.

Vehicle Communication System Using Li-Fi Technology

“…The 5v dc supply given to the Atmega328 microcontroller. The output voltage of the receiving circuit was about 5 V when the LED was close to the receiver while it decreased as the transmitting distance increased [17], [18]. The output of the system was quite good in terms detecting levels of data as being ON or OFF, although it decreased with the increment of distance but it was still good enough to be used in processing and applications.…”

Neural network controller based sequential switch cascaded H-bridge multilevel inverter

“…There are two types ofcontrol algorithms can be used. They are forward propagation algorithm and backward propagation algorithm [18]. A typical multilayer NN consists of an input layer, a middle layer, and an output layer.…”

“…The Insulated Gate Bipolar junction Transistor (IGBT) with antiparallel diode combination is used as switch. This sequential switch cascaded multilevel topology is compared with existing topologies presented in literature [10]- [18] in various aspects such as maximum blocking voltage, number of dc sources and number of IGBTs. The performance of the inverter is checked with MATLAB Simulation.…”

“…But here the variety of dc sources increases. A fundamental topology based on developed H-Bridges presented in literature [18] use unidirectional switches and also an algorithm to determine voltage rating, number of sources to analyze cost of the inverter is presented. An asymmetric topology with less number of main switches has been presented with concentration on THD reduction [19], [20].…”

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