Different Multilevel Inverter Topologies and Control Schemes for Renewable Energy Conversions: A Review
01 Feb 2018-
TL;DR: A review on multi level inverter topologies and control schemes of multilevel inverters for renewable energy conversions is presented.
Abstract: As the concerns about global warming and change in climate increases, a large focus is on improving distributed energy sources, which includes renewable energy sources. Renewable energy is the future source of energy. Improvement in power electronics has played an important role in incorporating the usage of renewable energy in our day-to-day life. Integrating various energy sources by means of converters by providing very high efficiency, good quality of power and reliability has become an important issue in these days. Most of Distributed Energy Resources (DERs) supply DC supply that varies over a wider rage, depending on load conditions. Therefore, a DC to AC power interface compatible with various standards is necessary. Multi-level inverters are apt for such applications since they can provide high volt-ampere ratings especially in renewable energy powered applications. This paper presents the A review on multi level inverter topologies and control schemes of multilevel inverters for renewable energy conversions.
Citations
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Journal Article•
TL;DR: In this article, an exploratory three-stage seven-level cascaded H-bridge inverter has been manufactured using nine H-bridges, each of which is associated with a 185-W solar panel.
Abstract: Due to the possibility of providing energy with much less dependence on the fossil fuels, renew-competent energy sources, in specified sun photovoltaic (PV) conversion have received elevated acceptance and progress in latest times. Big benefits of PV panels comprise easy and trustworthy power production and suitability for disbursed iteration. In addition the costs for photovoltaic modules is drastically lowering. To comprehend this issue, a control plan with modulation compensation scheme is likewise proposed. An exploratory three-stage seven-level cascaded H-bridge inverter has been manufactured using nine H-bridge modules (three modules for each stage). Each H-bridge module is associated with a 185-W solar panel. Simulation results are introduced to confirm the practicality of the proposed approach.
135 citations
Journal Article•
TL;DR: This paper presents a modular cascaded H-bridge multilevel photovoltaic (PV) inverter for single- or three-phase gridconnected applications and a control scheme with modulation compensation is also proposed.
Abstract: This paper presents a modular cascaded H-bridge multilevel photovoltaic (PV) inverter for single- or three-phase gridconnected applications. The modular cascaded multilevel topology helps to improve the efficiency and flexibility of PV systems.To realize better utilization of PV modules and maximize the solar energy extraction, a distributed maximum power pointtracking control scheme is applied to both single- and three-phase multilevel inverters, which allows independent control of eachdc-link voltage. For three-phase grid-connected applications, PV mismatches may introduce unbalanced supplied power, leadingto unbalanced grid current. To solve this issue, a control scheme with modulation compensation is also proposed. Anexperimental three-phase seven-level cascaded H-bridge inverter has been built utilizing 9H-bridge modules (three modulesper phase).
17 citations
01 Feb 2020
TL;DR: The proposed inverter is planned to feed the utility grid from renewable energy sources (RESs) to overcome the issue of output sinusoidal waveform in conventional MLIs by generating a multilevel waveform with too many levels, and fewer switches count.
Abstract: According to the increase of Multi-Level Inverter (MLI) applications in distributed generations, a novel single-phase grid-connected MLI topology is proposed in this paper. The proposed inverter is planned to feed the utility grid from renewable energy sources (RESs) to overcome the issue of output sinusoidal waveform in conventional MLIs by generating a multilevel waveform with too many levels, and fewer switches count. The proposed structure is fault-tolerant and modular. A detailed analysis of the proposed topology for two different 13 and 20 switches have been carried out to show its superiority over the conventional MLI topologies. The 79-level and 321-level of the proposed MLI are designed and simulated in MATLAB/SIMULINK environment. After a precise simulation, due to compliance with the IEC 61727–2004, about total harmonic distortion (THD) of output voltage and current, there is no need to use extra output filter.
8 citations
Cites background or methods from "Different Multilevel Inverter Topol..."
...MLIs are used in applications such as SVC and other FACTs, HVDC transmission lines, variable speed drive, and back-to-back systems [3], [7]....
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...They also show significant gains in reduced THD of power delivery for medium voltage sources [3]....
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...Because the establishment and costs of RESs are still a bit costly, the inverters must be highly reliable and efficient to reduce the cost of return in addition to high performance [3]....
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...Multilevel inverters are an attractive solution in medium and high power applications [3]....
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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
Proceedings Article•
01 Jan 2008
TL;DR: In this article, a different configuration based on different DC bus voltage for a diode-clamped multilevel inverter has been presented, in order to find an optimum arrangement with lower switching losses and optimised output voltage quality.
Abstract: In this paper, a different configuration based on different DC bus voltage for a diode-clamped multilevel inverter has been presented. Two different symmetrical and asymmetrical arrangements of a four-level diode clamped inverters have been compared, in order to find an optimum arrangement with lower switching losses and optimised output voltage quality. The optimised asymmetrical arrangement has been compared with a conventional four- level inverter. The comparison results show that an asymmetrical configuration can obtain more voltage levels in output voltage with same number of component compared with the conventional four-level inverter and this will lead to the reduction of harmonic content of output voltage. A predictive current control technique has been carried out to verify the viability of new configuration. The advantages of this control method are simplicity and applicability for n-level multilevel inverters, without a significant change in the control circuit.
2 citations
References
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TL;DR: The most important topologies like diode-clamped inverter (neutral-point clamped), capacitor-Clamped (flying capacitor), and cascaded multicell with separate DC sources are presented and the circuit topology options are presented.
Abstract: Multilevel inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. This paper presents the most important topologies like diode-clamped inverter (neutral-point clamped), capacitor-clamped (flying capacitor), and cascaded multicell with separate DC sources. Emerging topologies like asymmetric hybrid cells and soft-switched multilevel inverters are also discussed. This paper also presents the most relevant control and modulation methods developed for this family of converters: multilevel sinusoidal pulsewidth modulation, multilevel selective harmonic elimination, and space-vector modulation. Special attention is dedicated to the latest and more relevant applications of these converters such as laminators, conveyor belts, and unified power-flow controllers. The need of an active front end at the input side for those inverters supplying regenerative loads is also discussed, and the circuit topology options are also presented. Finally, the peripherally developing areas such as high-voltage high-power devices and optical sensors and other opportunities for future development are addressed.
6,472 citations
"Different Multilevel Inverter Topol..." refers background in this paper
...waveforms with lesser harmonic contents [10,27]....
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...They are widely used in photovoltaic arrays and in fuel cells [10, 14]....
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...Hence, the harmonic distortions are comparatively less as the number of steps are increased [10]....
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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
"Different Multilevel Inverter Topol..." refers methods in this paper
...The preliminary studies on MLI was conducted on a three level inverter, which was a Diode Clamped MLI [11]....
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08 Oct 1995
TL;DR: This paper presents three multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded-inverters with separate DC sources.
Abstract: Multilevel voltage source converters are emerging as a new breed of power converter options for high-power applications. The multilevel voltage source converters typically synthesize the staircase voltage wave from several levels of DC capacitor voltages. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. The techniques to balance the voltage between different levels normally involve voltage clamping or capacitor charge control. There are several ways of implementing voltage balance in multilevel converters. Without considering the traditional magnetic coupled converters, this paper presents three recently developed multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded-inverters with separate DC sources. The operating principle, features, constraints, and potential applications of these converters are discussed.
3,232 citations
"Different Multilevel Inverter Topol..." refers background in this paper
...A diode clamp converter, which is n level, has n-1 capacitances at the DC side, and it will produce a phase voltage having n levels [16]....
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03 Oct 1999
TL;DR: This paper introduces a general space vector modulation algorithm for n-level three-phase power converters that is computationally extremely efficient and is independent of the number of levels of the power converter.
Abstract: This paper introduces a general space vector modulation algorithm for n-level three-phase power converters. This algorithm is computationally extremely efficient and is independent of the number of levels of the power converter. At the same time, it provides excellent insight into the operation of multilevel power converters.
800 citations
"Different Multilevel Inverter Topol..." refers background in this paper
...Novel Multilevel converter[38], topology implemented with reduced count which work non isolated DC sources, but require a mix of bidirectional and unidirectional switch....
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...Modulation strategies for a multilevel inverter can be described based on switching frequency [38-39]....
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