Harmonic Analysis of a Five Level Cascaded Inverter Under a New Modulation Scheme

2012 ◽  
Author(s):  
J. Aziz ◽  
Z. Salam
Keyword(s):  
Harmonic Analysis ◽  
Key Words ◽  
Analytical Method ◽  
Output Voltage ◽  
Fourier Coefficients ◽  
Modulation Scheme ◽  
Test Rig ◽  
Single Carrier ◽  
Mathematical Equations

Kertas kerja ini mengusulkan satu kaedah analitikal untuk meramalkan magnitud dan kedudukan harmonik voltan keluaran penyongsang lima tahap. Penyongsang tersebut telah digunakan untuk melaksanakan satu skim pemodulatan baru yang menggunakan beberapa isyarat memodulat berserta isyarat pembawa tunggal. Seterusnya daripada skim pemodulatan tersebut, persamaan matematik yang dapat menentukan pensuisan PWM diterbitkan. Untuk memastikan kelebihan skim pemodulatan tersebut, analisis harmonik untuk mendapatkan pekali Fourier diterbitkan dan dikira menggunakan MATLAB. Harmonik voltan keluaran yang diukur dan dikira seterusnya dibandingkan dan dibincangkan. Kata kunci: Analisis harmonik; penyongsang bertahap This paper proposes an analytical method to predict the incidence and magnitude of harmonics of the output voltage of a five–level cascaded inverter. The cascaded inverter is subjected to a new modulation scheme, which uses multiple modulating signals with a single carrier. From the modulation scheme, mathematical equations that define the PWM switching instants are derived. In order to justify the merits of the proposed modulation scheme, harmonic analysis for the Fourier coefficients is outlined and calculated using MATLAB. An experimental five–level cascaded inverter test–rig is built and the new modulation scheme is implemented. The calculated and measured harmonics of the output voltage are compared and discussed. Key words: Harmonic analysis; cascaded inverter

scholarly journals Experimental validation of new self-voltage balanced 9L-ANPC inverter for photovoltaic applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Jagabar Sathik ◽  
Dhafer J. Almakhles ◽  
N. Sandeep ◽  
Marif Daula Siddique
Keyword(s):  
Output Voltage ◽  
Pulse Width Modulation ◽  
Superior Performance ◽  
Modulation Scheme ◽  
Switching Frequency ◽  
Switched Capacitor ◽  
Renewable Energy Resources ◽  
High Quality ◽  
Multilevel Inverters ◽  
Blocking Voltage

AbstractMultilevel inverters play an important role in extracting the power from renewable energy resources and delivering the output voltage with high quality to the load. This paper proposes a new single-stage switched capacitor nine-level inverter, which comprises an improved T-type inverter, auxiliary switch, and switched cell unit. The proposed topology effectively reduces the DC-link capacitor voltage and exhibits superior performance over recently switched-capacitor inverter topologies in terms of the number of power components and blocking voltage of the switches. A level-shifted multilevel pulse width modulation scheme with a modified triangular carrier wave is implemented to produce a high-quality stepped output voltage waveform with low switching frequency. The proposed nine-level inverter’s effectiveness, driven by the recommended modulation technique, is experimentally verified under varying load conditions. The power loss and efficiency for the proposed nine-level inverter are thoroughly discussed with different loads.

Minimum signal modulation scheme based on a single carrier for interleaved operation of parallel phase legs in voltage source converters

2014 ◽  
Vol 7 (5) ◽  
pp. 1305-1312 ◽  
Author(s):  
Gabriel J. Capella ◽  
Igor Gabiola ◽  
Josep Pou ◽  
Jordi Zaragoza ◽  
Salvador Ceballos ◽  
...  
Keyword(s):  
Voltage Source ◽  
Modulation Scheme ◽  
Voltage Source Converters ◽  
Signal Modulation ◽  
Single Carrier

scholarly journals A Sub-Region Based Space Vector Modulation Scheme for Dual 2-Level Inverter System

2018 ◽  
Vol 8 (6) ◽  
pp. 4902
Author(s):  
R. Palanisamy ◽  
A. Velu ◽  
K. Selvakumar ◽  
D. Karthikeyan ◽  
D. Selvabharathi ◽  
...  
Keyword(s):  
Output Voltage ◽  
Modulation Scheme ◽  
Space Vector Modulation ◽  
Switching Loss ◽  
Space Vector ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Harmonic Content ◽  
Voltage Stress ◽  
Vector Modulation

This paper deals the implementation of 3-level output voltage using dual 2-level inverter with control of sub-region based Space Vector Modulation (SR-SVM). Switching loss and voltage stress are the most important issues in multilevel inverters, for keep away from these problems dual inverter system executed. Using this proposed system, the conventional 3-level inverter voltage vectors and switching vectors can be located. In neutral point clamped multilevel inverter, it carries more load current fluctuations due to the DC link capacitors and it requires large capacitors. Based on the sub-region SVM used to control IGBT switches placed in the dual inverter system. The proposed system improves the output voltage with reduced harmonic content with improved dc voltage utilisation. The simulation and hardware results are verified using matlab/simulink and dsPIC microcontroller.

scholarly journals Orthogonal Time Sequency Multiplexing Modulation

2021 ◽  
Author(s):  
Tharaj Thaj ◽  
Emanuele Viterbo
Keyword(s):  
Time Domain ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Performance ◽  
High Mobility ◽  
Low Complexity ◽  
Modulation Scheme ◽  
Frequency Space ◽  
Time Frequency ◽  
Single Carrier ◽  
The Time Domain

This paper proposes <i>orthogonal time sequency multiplexing</i> (OTSM), a novel single carrier modulation scheme based on the well known Walsh-Hadamard transform (WHT) combined with row-column interleaving, and zero padding (ZP) between blocks in the time-domain. The information symbols in OTSM are multiplexed in the delay and sequency domain using a cascade of time-division and Walsh-Hadamard (sequency) multiplexing. By using the WHT for transmission and reception, the modulation and demodulation steps do not require any complex multiplications. We then propose two low-complexity detectors: (i) a simpler non-iterative detector based on a single tap minimum mean square time-frequency domain equalizer and (ii) an iterative time-domain detector. We demonstrate, via numerical simulations, that the proposed modulation scheme offers high performance gains over orthogonal frequency division multiplexing (OFDM) and exhibits the same performance of orthogonal time frequency space (OTFS) modulation, but with lower complexity. In proposing OTSM, along with simple detection schemes, we offer the lowest complexity solution to achieving reliable communication in high mobility wireless channels, as compared to the available schemes published so far in the literature.

scholarly journals Harmonic Analysis of the Output Voltage of a Third-Harmonic-Injected Inverter for LSM Drives

2005 ◽  
Vol 125 (2) ◽  
pp. 133-139 ◽  
Author(s):  
Hidenori Shigeeda ◽  
Akinobu Okui ◽  
Hirofumi Akagi
Keyword(s):  
Harmonic Analysis ◽  
Output Voltage ◽  
Third Harmonic

scholarly journals Realization of a Generalized Switched-Capacitor Multilevel Inverter Topology with Less Switch Requirement

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1556 ◽  
Author(s):  
Anzar Ahmad ◽  
MU Anas ◽  
Adil Sarwar ◽  
Mohammad Zaid ◽  
Mohd Tariq ◽  
...  
Keyword(s):  
Output Voltage ◽  
Multilevel Inverter ◽  
Basic Unit ◽  
Modulation Scheme ◽  
Switched Capacitor ◽  
Level Control ◽  
Active Components ◽  
Proposed Model ◽  
Environment Simulation ◽  
The Cost

Conventional multilevel inverter topologies like neutral point clamped (NPC), flying capacitor (FC), and cascade H bridge (CHB) are employed in the industry but require a large number of switches and passive and active components for the generation of a higher number of voltage levels. Consequently, the cost and complexity of the inverter increases. In this work, the basic unit of a switched capacitor topology was generalized utilizing a cascaded H-bridge structure for realizing a switched-capacitor multilevel inverter (SCMLI). The proposed generalized MLI can generate a significant number of output voltage levels with a lower number of components. The operation of symmetric and asymmetric configurations was shown with 13 and 31 level output voltage generation, respectively. Self-capacitor voltage balancing and boosting capability are the key features of the proposed SCMLI structure. The nearest level control modulation scheme was employed for controlling and regulating the output voltage. Based on the longest discharging time, the optimum value of capacitance was also calculated. A generalized formula for the generation of higher voltage levels was also derived. The proposed model was simulated in the MATLAB®/Simulink 2016a environment. Simulation results were validated with the hardware implementation.

Harmonic analysis of the output voltage of a third-harmonic-injected inverter for LSM drives

2007 ◽  
Vol 160 (1) ◽  
pp. 71-78
Author(s):  
Hidenori Shigeeda ◽  
Akinobu Okui ◽  
Hirofumi Akagi
Keyword(s):  
Harmonic Analysis ◽  
Output Voltage ◽  
Third Harmonic

Diquat residues in lentil following preharvest treatment

1991 ◽  
Vol 71 (2) ◽  
pp. 413-418
Author(s):  
Allan Cessna
Keyword(s):  
Key Words ◽  
Spectrophotometric Determination ◽  
Analytical Method ◽  
Lens Culinaris ◽  
Growth Stage ◽  
Crop Growth ◽  
Growth Stages ◽  
Limit Of Quantification ◽  
Crop Growth Stages

In a 2-yr study, residues of diquat were spectrophotometrically determined in lentil (Lens culinaris Medik.) seed and straw/chaff following preharvest treatment using 0.56 kg ha−1 at three crop growth stages. Diquat residues ranged from 12.9 to 17.3 mg kg−1 in the lentil straw/chaff one day after application and decreased to 1.1 to 6.0 mg kg−1 2 wk later. Diquat residues in the seed were in the order of 0.05 mg kg−1 or less regardless of time of sampling after spraying or growth stage of the crop at application. The limit of quantification of the analytical method was 0.04 mg kg−1, and recoveries of diquat from fortified seed and straw were in the order of 70%. Key words: Diquat, lentil, residues, spectrophotometric determination

Structure Optimization of Piezoelectric Micromachined Modal Gyroscope

2011 ◽  
Vol 130-134 ◽  
pp. 3377-3380
Author(s):  
Xiao Jun Hu ◽  
Xiao Sheng Wu ◽  
Zheng Wang ◽  
Wen Yuan Chen ◽  
Wei Ping Zhang
Keyword(s):  
Angular Velocity ◽  
Harmonic Analysis ◽  
Coriolis Force ◽  
Output Voltage ◽  
Working Condition ◽  
Operation Mode ◽  
Structure Optimization ◽  
Mass Spring ◽  
Quantitative Indicators ◽  
Device Size

This paper reports a novel kind of solid micro-gyroscope, which is called piezoelectric micromachined modal gyroscope (PMMG). PMMG has large stiffness and robust resistance to shake and strike because there is no evident mass-spring component in its structure. This work focused on quantitative optimization of the gyroscope, which is still blank for such gyroscope. A set of quantitative indicators were developed to optimize the operation mode and corresponding device size was obtained. By FEM, the harmonic analysis was conducted to find the way to efficiently actuate the operation mode needed. At last, the Coriolis analysis was conducted to show the relation between angular velocity and differential output voltage by the Coriolis force under working condition.

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