A 31-level MLI Topology with Various Level-Shift PWM Techniques and its Comparative Analysis
01 Oct 2018-pp 312-316
TL;DR: This paper highlights the comparative analysis of carrier wave based modulation techniques on a single phase extendable reduced switch topology and a detailed analysis of voltage and current total harmonic distortion for each pulse width modulation (PWM) control strategy is carried out.
Abstract: This paper highlights the comparative analysis of carrier wave based modulation techniques on a single phase extendable reduced switch topology. The topology is implemented using level shift PWM (pulse width modulation) and a detailed analysis of voltage and current total harmonic distortion (THD) for each pulse width modulation (PWM) control strategy is carried out. The extendable topology uses 4 dc sources and 10 switching devices which helps to minimize the complexity of the circuit and overall cost. The performance of the switching strategies for 31-level is carried out in Matlab/Simulink.
Citations
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01 Jan 2020
TL;DR: This paper is mainly aims at comparing the reduced switch inverter with general switching and three PWM techniques and testing the proposed model by 4 different techniques.
Abstract: This paper is mainly aims at comparing the reduced switch inverter with general switching and three PWM techniques. Reducing switch count helps to gets cost cut down of inverter by large scale. This also makes compact, logic easy and also easy control. These kinds of inverters are very useful for low power rating or medium power ratings[1]. But high power rating requirements we have to use normal inverters. Here in this paper we are testing the proposed model by 4 different techniques. Such as normal switching and 3 of level shift PWM techniques.
2 citations
1 citations
01 Jan 2022
TL;DR: In this paper , a battery system has been augmented with a permanent magnet synchronous generator (PMSG) for continuous power supply, and the control pulses for all the power electronic devices and battery control have been derived from an embedded controller.
Abstract: Renewable energy sources become reliable when connected to a battery system. Research advancements in battery technologies motivate to move towards micro-grids, renewables-based standalone systems and smart grids. Wind energy conversion system (WECS) is being the most prominent and abundant renewable energy conversion system due to its high capacity inclines researchers to increase the efficiency and reduce complexity of WECS. Permanent magnet synchronous generator (PMSG) is being simple and efficient at low power ratings, and the present work is focused on generating energy from WECS using PMSG. The objective of the paper is to power three-phase unbalanced load using the power electronic interfaces from PMSG-based WECS. For continuous power supply, a battery system has been augmented. The control pulses for all the power electronic devices and battery control have been derived from an embedded controller. The proposed model has been simulated and validated using MATLAB/Simulink software.
1 citations
21 Jul 2022
TL;DR: In this article , a three phase 9-level Cascaded H-bride MLI is considered with level shift PWM scheme to drop the total harmonic distortion (THD) factor in the voltage response.
Abstract: The requirement of high power and maximum efficiency in case of the AC to DC power conversion, voltage source multilevel inverters (VSMLI) proved to be efficient. Neutral/diode clamped MLI, Capacitor type and cascaded Bridge Type are some of the MLI's used in both single as well as three phase scenarios. The output of the MLI is distorted i.e., it contains harmonics in the output response. The need to obtain a pure sinusoidal AC output leads to harmonic elimination techniques. ‘Pulse Width Modulation’ (PWM) procedure is widely used harmonic elimination technique. In this paper a three phase 9-level Cascaded H-bride MLI is considered with level shift PWM scheme to drop the Total Harmonic Distortion (THD) factor in the voltage response. Integral Square Error (ISE) of the voltage waveform is evaluated and is minimized using Proportional-Integral (PI) controller. The PI controller is tuned using two meta heuristic intelligent optimization techniques. ‘Teaching Learning Based Optimization’ (TLBO) and ‘Genetic Algorithm’ (GA) are compared on the basis of precise gain values and THD percentage obtained. The GA holds good in minimizing the harmonics to a greater extent.
21 Jul 2022
TL;DR: In this paper , a three phase 9-level Cascaded H-bride MLI is considered with level shift PWM scheme to drop the total harmonic distortion (THD) factor in the voltage response.
Abstract: The requirement of high power and maximum efficiency in case of the AC to DC power conversion, voltage source multilevel inverters (VSMLI) proved to be efficient. Neutral/diode clamped MLI, Capacitor type and cascaded Bridge Type are some of the MLI's used in both single as well as three phase scenarios. The output of the MLI is distorted i.e., it contains harmonics in the output response. The need to obtain a pure sinusoidal AC output leads to harmonic elimination techniques. ‘Pulse Width Modulation’ (PWM) procedure is widely used harmonic elimination technique. In this paper a three phase 9-level Cascaded H-bride MLI is considered with level shift PWM scheme to drop the Total Harmonic Distortion (THD) factor in the voltage response. Integral Square Error (ISE) of the voltage waveform is evaluated and is minimized using Proportional-Integral (PI) controller. The PI controller is tuned using two meta heuristic intelligent optimization techniques. ‘Teaching Learning Based Optimization’ (TLBO) and ‘Genetic Algorithm’ (GA) are compared on the basis of precise gain values and THD percentage obtained. The GA holds good in minimizing the harmonics to a greater extent.
References
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Abstract: Multilevel converters are considered today as the state-of-the-art power-conversion systems for high-power and power-quality demanding applications. This paper presents a tutorialonthistechnology,coveringtheoperatingprincipleand the different power circuit topologies, modulation methods, technical issues and industry applications. Special attention is given to established technology already found in industry with more in-depth and self-contained information, while recent advances and state-of-the-art contributions are addressed with useful references. This paper serves as an introduction to the subject for the not-familiarized reader, as well as an update or reference for academics and practicing engineers working in the field of industrial and power electronics.
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"A 31-level MLI Topology with Variou..." refers background in this paper
...The phase shifted methodology induces a phase shift between the adjacent carriers [6]....
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TL;DR: In this paper, a modified PSC technique based on partly shifted carriers for all disposition types including phase disposition (PD) which is suitable for three-phase cascaded inverters was proposed.
Abstract: Phase-shifted carrier (PSC) pulsewidth modulation (PWM) in its conventional form is a good solution for single-phase Cascaded inverters as alternative phase opposition disposition (APOD) PWM for single-phase diode clamped inverters. PSC distributes the switching angles of APOD PWM waveform among the legs uniformly and reduces the switching frequency of each leg. This paper proposes a modified PSC technique based on partly shifted carriers for all disposition types including phase disposition (PD) which is suitable for three-phase cascaded inverters. Simulation results are also included for using carrier-based space-vector PWM (SVPWM).
302 citations
"A 31-level MLI Topology with Variou..." refers background in this paper
...The multi carrier PWM strategies discussed involves N-1 carrier signals being compared continuously with sinusoidal waveform of fundamental frequency [5]....
[...]
23 Jun 2000
TL;DR: In this paper, an analytical solution of pulse width modulation (PWM) strategies for multilevel neutral point clamped (NPC) and cascaded inverters is presented, where the carrier frequencies are adjusted to achieve the same number of total switch transitions for each inverter over one fundamental cycle.
Abstract: Analytical solutions of pulse width modulation (PWM) strategies for multilevel neutral point clamped (NPC) and cascaded inverters are presented. These solutions show that the alternative phase opposition disposition (APOD) PWM strategy for NPC inverters produces the same spectral components as the phase shifted carrier PWM (PSCPWM) strategy for cascaded inverters, when the carrier frequencies are adjusted to achieve the same number of total switch transitions for each inverter over one fundamental cycle. From this understanding, a method is proposed to apply the harmonically superior phase disposition (PD) PWM strategy for NPC inverters to cascaded inverters, to achieve improved harmonic performance for the modulation of cascaded inverters. Both theoretical and experimental results confirming this understanding are presented.
163 citations
"A 31-level MLI Topology with Variou..." refers background in this paper
...In PD-PWM, all the carrier waves generated are in phase with respect to each other [12]....
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06 Nov 2009
TL;DR: In this article, a multilevel inverter with a small number of switching devices is proposed, which can output more number of voltage levels in the same number of the switching devices by using this conversion.
Abstract: A novel multilevel inverter with a small number of switching devices is proposed. It consists of an H-bridge and an inverter which outputs multilevel voltage by switching the dc voltage sources in series and in parallel. The proposed inverter can output more number of voltage levels in the same number of the switching devices by using this conversion. The number of gate driving circuits is reduced, which leads to the reduction of the size and power consumption in the driving circuits. The total harmonic of the output waveform is also reduced. The proposed inverter is driven by the hybrid modulation (HM) method. In this paper, the circuit configuration, the theoretical operation, Fourier analysis, simulation results with MATLAB/ SIMULINK and the experimental results are shown. The experimental results accorded with the simulation results.
161 citations
"A 31-level MLI Topology with Variou..." refers methods in this paper
...The methodologies discussed here gives an insight of the strategy of collating sinusoidal signal with high frequency carrier waves [8]....
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