Performance analysis of a multilevel inverter topology with reduced switches
01 Sep 2015-pp 1-5
TL;DR: A new multilevel inverter topology with reversing voltage component to improve the overall performance is proposed and requires less number of switches and carrier signals compared to other topologies so the overall cost and complexity of the circuit is reduced.
Abstract: Multilevel inverter is very effective in reducing the harmonics of AC waveform and useful for high power applications. Compared to the conventional two level inverters, it has many advantages such as higher dc link voltages, low electromagnetic interference and reduced harmonic distortion. But, it has some disadvantages such as usage of more switches, voltage balancing problem and complex pulse width modulation control. Overcoming these disadvantages, in this paper a new multilevel inverter topology with reversing voltage component to improve the overall performance is proposed. The proposed topology requires less number of switches and carrier signals compared to other topologies. Hence the overall cost and complexity of the circuit is reduced especially for higher output levels. The performance of a nine level proposed topology has been analyzed in terms of total harmonic distortion (THD) by using MATLAB/Simulink.
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01 Jan 2020
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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
"Performance analysis of a multileve..." refers background in this paper
...They have the capability to deliver high power output with lower dv/dt or di/dt and less distorted output waveforms resulting in reduction of EMI noise and size of the output filter [2],[3]....
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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
"Performance analysis of a multileve..." refers background in this paper
...III [26] where ‘N’ represents the number of output voltage levels....
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...Normalised FFT of conventional cascaded nine-level inverter III....
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TL;DR: A survey of different topologies, control strategies and modulation techniques used by cascaded multilevel inverters in the medium-voltage inverter market is presented.
Abstract: Cascaded multilevel inverters synthesize a medium-voltage output based on a series connection of power cells which use standard low-voltage component configurations. This characteristic allows one to achieve high-quality output voltages and input currents and also outstanding availability due to their intrinsic component redundancy. Due to these features, the cascaded multilevel inverter has been recognized as an important alternative in the medium-voltage inverter market. This paper presents a survey of different topologies, control strategies and modulation techniques used by these inverters. Regenerative and advanced topologies are also discussed. Applications where the mentioned features play a key role are shown. Finally, future developments are addressed.
2,111 citations
"Performance analysis of a multileve..." refers background or methods in this paper
...The three major multilevel inverters proposed are diode clamped (neutral clamped), flying capacitor (capacitor clamped) and cascaded H-bridge inverter with separate dc sources [2]-[4]....
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...References [2] and [24] have been discussed about the cascaded multilevel inverter topology....
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...They have the capability to deliver high power output with lower dv/dt or di/dt and less distorted output waveforms resulting in reduction of EMI noise and size of the output filter [2],[3]....
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TL;DR: A new multilevel converter topology that has many steps with fewer power electronic switches results in reduction of the number of switches, losses, installation area, and converter cost.
Abstract: This paper introduces a new multilevel converter topology that has many steps with fewer power electronic switches. The proposed circuit consists of series-connected submultilevel converters blocks. The optimal structures of this topology are investigated for various objectives, such as minimum number of switches and capacitors, and minimum standing voltage on switches for producing maximum output voltage steps. A new algorithm for determination of dc voltage sourcespsila magnitudes has also been presented. The proposed topology results in reduction of the number of switches, losses, installation area, and converter cost. The operation and performance of the proposed multilevel converter has been verified by the simulation and experimental results of a single-phase 53-level multilevel converter.
645 citations
TL;DR: This paper presents a single-phase five-level photovoltaic inverter topology for grid-connected PV systems with a novel pulsewidth-modulated (PWM) control scheme that offers much less total harmonic distortion and can operate at near-unity power factor.
Abstract: This paper presents a single-phase five-level photovoltaic (PV) inverter topology for grid-connected PV systems with a novel pulsewidth-modulated (PWM) control scheme. Two reference signals identical to each other with an offset equivalent to the amplitude of the triangular carrier signal were used to generate PWM signals for the switches. A digital proportional-integral current control algorithm is implemented in DSP TMS320F2812 to keep the current injected into the grid sinusoidal and to have high dynamic performance with rapidly changing atmospheric conditions. The inverter offers much less total harmonic distortion and can operate at near-unity power factor. The proposed system is verified through simulation and is implemented in a prototype, and the experimental results are compared with that with the conventional single-phase three-level grid-connected PWM inverter.
584 citations
"Performance analysis of a multileve..." refers background in this paper
...The topologies proposed in [9]-[11] also have the same drawback because of the high frequency switches which can be used mainly for high voltage applications....
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