Modified Cascaded Multilevel Inverter with Reduced Component Count
TL;DR: A basic module for symmetrical multilevel inverter composed of cascaded basic unit with H-bridge and multi-carrier based level-shift pulse width modulation scheme, which results in reduction of number of components compared to other conventional and recent multileVEL inverters.
Abstract: This paper introduces a basic module for symmetrical multilevel inverter. The proposed multilevel inverter is composed of cascaded basic unit with H-bridge. Multi-carrier based level-shift pulse width modulation scheme is developed to achieve the switching signals for switches. The proposed cascaded multilevel inverter results in reduction of number of components compared to other conventional and recent multilevel inverters. The performance and operation of proposed inverter is verified through simulation results through MATLAB/Simulink software and experimental implementation of single phase 11-level inverter.
Citations
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28 Aug 2009
TL;DR: In this article, a novel H-bridge multilevel PWM converter topology based on a series connection of a high voltage (HV) diode-clamped inverter and a low voltage (LV) conventional inverter is proposed.
Abstract: A novel H-bridge multilevel PWM converter topology based on a series connection of a high voltage (HV) diode-clamped inverter and a low voltage (LV) conventional inverter is proposed. A DC link voltage arrangement for the new hybrid and asymmetric solution is presented to have a maximum number of output voltage levels by preserving the adjacent switching vectors between voltage levels. Hence, a fifteen-level hybrid converter can be attained with a minimum number of power components. A comparative study has been carried out to present high performance of the proposed configuration to approach a very low THD of voltage and current, which leads to the possible elimination of output filter. Regarding the proposed configuration, a new cascade inverter is verified by cascading an asymmetrical diode-clamped inverter, in which nineteen levels can be synthesized in output voltage with the same number of components. To balance the DC link capacitor voltages for the maximum output voltage resolution as well as synthesise asymmetrical DC link combination, a new Multi-output Boost (MOB) converter is utilised at the DC link voltage of a seven-level H-bridge diode-clamped inverter. Simulation and hardware results based on different modulations are presented to confirm the validity of the proposed approach to achieve a high quality output voltage.
23 citations
05 Jan 2021
TL;DR: In this paper, a new model of inverter is proposed which has a single DC source and no capacitor and clamping diode, which leads to simplicity, cost efficiency and reduction of switching loss and hence improvement of the overall efficiency.
Abstract: In comparison with among cascaded H-bridge multilevel inverter, diode clamped multilevel inverter, flying capacitor multilevel inverter, the cascaded H-bridge multilevel inverter is the most popular. Because of its reduced number of components, this inverter has gained popularity. But among the chief disadvantages, requirement of large no. of isolated voltage sources per cell makes the system bulky and costly. The essentiality of multilevel inverter is established by giving high output power from the medium voltage sources like batteries, super-capacitors, and solar panels at a reduced harmonic distortion. Although the current multilevel inverters reduced the total harmonic distortion, but a concern on higher no. of component counts is still present. Also, the presence of different ratings of capacitors and clamping diodes makes these topologies more complex and costly. A new model of inverter is proposed in this paper. This proposed model contains lesser amount of components which has a single DC source and no capacitor and clamping diode. This leads to simplicity, cost efficiency and reduction of switching loss and hence improvement of the overall efficiency.
9 citations
25 May 2021
TL;DR: In this paper, a new concept of asymmetrical cascaded hybrid bridge multilevel inverter (ACHB-MLI) was presented to produce nine-level output waveform with only seven switches and two DC supplies instead of sixteen switches and four DC supplies used in the conventional cascaded HB- MLI. And the proposed topology is investigated under phase disposition pulse width modulation technique (PD-PWM) and the results have been compared with conventional HBM inverter.
Abstract: recently the researchers in multilevel inverter (MLI) have interested in reducing the number of switches and sources with acceptable total harmonic distortion (THD %) of the output voltage waveform to reduce losses and costs. This paper present a new concept of asymmetrical cascaded hybrid bridge multilevel inverter (ACHB-MLI) to produce nine-level output waveform with only seven switches and two DC supplies instead of sixteen switches and four DC supplies used in the conventional cascaded hybrid bridge multilevel inverter (CHB-MLI). The proposed topology is investigated under phase disposition pulse width modulation technique (PD-PWM) and the results have been compared with conventional cascaded multilevel inverter. The simulation results are provided using MATLAB Simulink.
8 citations
TL;DR: The simulation results of a BLDC motor based on two multilevel inverters are compared with each other considering the total harmonic distortion (THD) and the utilization of the dc-bus voltage, the comparition verified that the clamped diode inverter has a better harmonic spectra.
Abstract: The multilevel inverters have been used especially in renewable energy aspects in order to assess total harmonic distortion (THD). THD is considered to produce a good quality of current signal of BLDC motor drive. In this paper, a solar PV inveter fed brushless DC (BLDC) motor drive is discussed considering two topologies of three phase multilevel inverters. These topologies are flying capacitor and clamped diode inverters. The inverter efficiency and output power have an effectiveness on THD values. A boost dc to dc converter using incremental conductance maximum power point tracking (INC-MPPT) is implemented with a solar PV. The mathematical model of the proposed systems ares tudied via simulation using Matlab/Simulink. The simulation results of a BLDC motor based on two multilevel inverters are compared with each other considering the THD and the utilization of the dc-bus voltage, the comparition verified that the clamped diode inverter has a better harmonic spectra.still the overshoot is a little bit high in the two types of inverter that are proposed.
3 citations
Cites background from "Modified Cascaded Multilevel Invert..."
...Rao (2017) [8] discussed the different multilevel inverter (MLI) topologies review including diode clamped multilevel DC-MLI) inverter, flying capacitor multilevel FC-MLI) inverter, cascaded H-bridge (CHB )converter and it introduced their applications in renewable energy [9-11]....
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TL;DR: In this paper , a new multilevel inverter is used in adding a (bidirectional) two way switch in between the capacitor and a traditional H-bridge module, which produces a better sine wave.
Abstract: Introduction. In this world of technical advancement, conventional resources are at the stage of destruction. To avoid such problems, we are going to use an alternative energy source namely solar by photovoltaic effect. The demand for multilevel inverters increased as they are used for different dynamic (high) voltage and dynamic (high) power appliances as they are capable of producing the output wave shape with low total harmonic distortion. Novelty. A new multilevel inverter is used in adding a (bidirectional) two way switch in between the capacitor and a traditional H-bridge module. This produces a better sine wave. By series connection of these two H-bridge modules, nine levels output voltage including zero is possible. The purpose of the proposed topology is reduction in the number of switches and it gives the good result with comparatively less power loss when it is compared with the other normal basic traditional inverters of the same output quality. Methods. In this paper, sinusoidal pulse width modulation technique is used for the working of the switches in the multilevel inverter. The results are verified by using simulation and also experimental setup is done. From the results it is observed that the proposed topology with reduced number of switches gives lower electromagnetic interference, lower harmonic distortion. Practical value. The total harmonic distortion value in the simulation is 14.4 % and practically it is 13.8 %.
1 citations
References
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01 Jan 1980
TL;DR: In this article, a neutral-point-clamped PWM inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed.
Abstract: A new neutral-point-clamped pulsewidth modulation (PWM) inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed. This inverter output contains less harmonic content as compared with that of a conventional type. Two inverters are compared analytically and experimentally. In addition, a new PWM technique suitable for an ac drive system is applied to this inverter. The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
4,432 citations
TL;DR: The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
Abstract: A new neutral-point-clamped pulsewidth modulation (PWM) inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed. This inverter output contains less harmonic content as compared with that of a conventional type. Two inverters are compared analytically and experimentally. In addition, a new PWM technique suitable for an ac drive system is applied to this inverter. The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
4,328 citations
TL;DR: In this article, a new topology of cascaded multilevel inverter using a reduced number of switches, insulated gate driver circuits and voltage standing on switches is proposed, which results in reduction of installation area and cost and has simplicity of control system.
475 citations
Additional excerpts
...COMPARISON OF PROPOSED AND CONVENTIONAL MLIS Parameters CHB Ref [12] Ref [13] Ref [14] Proposed No....
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01 Nov 2004
TL;DR: A new class of multilevel inverters based on a multileVEL DC link (MLDCL) and a bridge inverter to reduce the number of switches, clamping diodes or capacitors is presented.
Abstract: This paper presents a new class of multilevel inverters based on a multilevel dc link (MLDCL) and a bridge inverter to reduce the number of switches, clamping diodes, or capacitors. An MLDCL can be a diode-clamped phase leg, a flying-capacitor phase leg, or cascaded half-bridge cells with each cell having its own dc source. A multilevel voltage-source inverter can be formed by connecting one of the MLDCLs with a single-phase bridge inverter. The MLDCL provides a dc voltage with the shape of a staircase approximating the rectified shape of a commanded sinusoidal wave, with or without pulsewidth modulation, to the bridge inverter, which in turn alternates the polarity to produce an ac voltage. Compared with the cascaded H-bridge, diode-clamped, and flying-capacitor multilevel inverters, the MLDCL inverters can significantly reduce the switch count as well as the number of gate drivers as the number of voltage levels increases. For a given number of voltage levels m, the required number of active switches is 2/spl times/(m-1) for the existing multilevel inverters but is m+3 for the MLDCL inverters. Simulation and experimental results are included to verify the operating principles of the MLDCL inverters.
432 citations
TL;DR: In this paper, the authors proposed a generalized formulation for selective harmonic elimination pulsewidth modulation (SHE-PWM) control suitable for high-voltage high-power cascaded multilevel voltage source converters (VSC) with both equal and nonequal dc sources used in constant frequency utility applications.
Abstract: This paper proposes a generalized formulation for selective harmonic elimination pulse-width modulation (SHE-PWM) control suitable for high-voltage high-power cascaded multilevel voltage source converters (VSC) with both equal and nonequal dc sources used in constant frequency utility applications. This formulation offers more degrees of freedom for specifying the cost function without any physical changes to the converter circuit, as compared to conventional stepped waveform technique, and hence the performance of the converter is greatly enhanced. The paper utilizes the merits of the hybrid real coded genetic algorithm (HRCGA) in finding the optimal solution to the nonlinear equation system with fast and guaranteed convergence. It is confirmed that multiple independent sets of solutions exist. Different operating points for both five- and seven-level converters including single- and three-phase patterns are documented. Selected experimental results are reported to verify and validate the theoretical and simulation findings.
394 citations