Operation, Control and Verification of Seven-Level Quasi-Z-Source-Based T-Type Inverter

2019 ◽  
Vol 29 (02) ◽  
pp. 2050023
Author(s):  
Ramesh Rahul Jammy ◽  
Kirubakaran Annamalai ◽  
Chinmay Kumar Das
Keyword(s):  
Duty Cycle ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Voltage Level ◽  
Text Type ◽  
Control Schemes ◽  
Operation Control ◽  
Bidirectional Switches ◽  
And Control

In this paper, a novel seven-level Quasi-Z-Source-based [Formula: see text]-type inverter (7L[Formula: see text]qZST[Formula: see text]) is proposed. The proposed inverter is an upgrade of Quasi-Z-source (qZs) network and seven-level [Formula: see text]-type inverter. The 7L qZST[Formula: see text] comprises of three qZs-based impedance networks, two bidirectional switches and an [Formula: see text]-bridge inverter. It owns the advantages of reduced switch count, improved output voltage gain, enhanced reliability and better quality of output voltage and current. The performance of the proposed topology is tested for two different pulse width modulation techniques based on shoot-through control. The first technique offers simple control and operated at a fixed shoot-through duty cycle for realizing output voltage level. The second technique facilitates independent control of each qZs network dc-link voltage and they can be operated at different shoot through duty cycle which overcomes the limitation of first technique with better quality in output voltage. The detailed operation of the proposed topology and control schemes have been elaborated for different switching states for each output voltage level generation. Extensive simulation and experimentation are performed for both the switching schemes to verify their performance under steady state and dynamic conditions. Furthermore, a brief comparison is constructed to highlight the merits of the proposed inverter with conventional topologies.

scholarly journals Induction Motor Drives Fed by an NPC Inverter with Unbalanced DC-Link

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1379 ◽  
Author(s):  
Umberto Abronzini ◽  
Ciro Attaianese ◽  
Matilde D’Arpino ◽  
Mauro Di Monaco ◽  
Giuseppe Tomasso
Keyword(s):  
Output Voltage ◽  
Harmonic Distortion ◽  
Voltage Regulation ◽  
Motor Drives ◽  
Operating Conditions ◽  
Switching Frequency ◽  
Voltage Level ◽  
Voltage Quality ◽  
Vector Modulation

Neutral Point Clamped (NPC) converters with n levels are traditionally controlled in such a way that the DC-link capacitors operate at 1/( n - 1) of the total DC-link voltage level. The voltage level across the DC-link capacitors has to be properly regulated by the capacitor unbalance control to contain the harmonic distortion of the converter output voltages. State-of-the-art modulation techniques address the problem of the DC-link voltage regulation for NPC inverters. However, they highly show reduced performance when unbalanced DC-link voltages are considered. In this paper, a novel Space Vector Modulation (SVM) is proposed for NPC converters with an unbalanced DC-link. At every modulation interval, the technique defines the optimal switching pattern by considering the actual unbalanced DC-link conditions. The proposed modulation allows improving the harmonic content of the NPC converter output voltage with respect to a traditional ML-SVM, when the same operating conditions are considered. As an extension, the proposed modulation technique will guarantee the same output voltage quality of a traditional ML-SVM with unbalanced DC-link, while improving the conversion efficiency thanks to a reduction of switching frequency.

Designing of a High Voltage Power Supply for Electrospinning Apparatus Using a High Voltage Flyback Transformer (HVFBT)

2015 ◽  
Vol 771 ◽  
pp. 145-148 ◽  
Author(s):  
Muhammad Miftahul Munir ◽  
Dian Ahmad Hapidin ◽  
Khairurrijal
Keyword(s):  
High Voltage ◽  
Duty Cycle ◽  
Power Supply ◽  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Experimental Results ◽  
High Voltage Power Supply ◽  
Electrospinning Technique ◽  
The World

Research on nanofiber materials is actively done around the world today. Various types of nanofibers have been synthesized using an electrospinning technique. The most important component when synthesizing nanofibers using the electrospinning technique is a DC high voltage power supply. Some requirements must be fulfilled by the high voltage power supply, i.e., it must be adjustable and its output voltage reaches tens of kilovolts. This paper discusses the design and development of a high voltage power supply using a diode-split transformer (DST)-type high voltage flyback transformer (HVFBT). The DST HVFBT was chosen because of its simplicity, compactness, inexpensiveness, and easiness of finding it. A pulse-width modulation (PWM) circuit with controlling frequency and duty cycle was fed to the DST HVFBT. The high voltage power supply was characterized by the frequency and duty cycle dependences of its output voltage. Experimental results showed that the frequency and duty cycle affect the output voltage. The output voltage could be set from 1 to 18 kV by changing the duty cycle. Therefore, the nanofibers could be synthesized by employing the developed high voltage power supply.

scholarly journals A 7-Level Single DC Source Cascaded H-Bridge Multilevel Inverter with a Modified DTC Scheme for Induction Motor-Based Electric Vehicle Propulsion

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Farid Khoucha ◽  
Khoudir Marouani ◽  
Mohamed Benbouzid ◽  
Abdelaziz Kheloui ◽  
Abdeslam Mamoune
Keyword(s):  
Induction Motor ◽  
Electric Vehicle ◽  
Output Voltage ◽  
Motor Drives ◽  
Multilevel Inverter ◽  
Induction Motor Drives ◽  
Voltage Level ◽  
Vehicle Propulsion ◽  
Control Scheme ◽  
And Control

This paper presents a new hybrid cascaded H-bridge multilevel inverter motor drive DTC scheme for electric vehicles where each phase of the inverter can be implemented using a single DC source. Traditionally, each phase of the inverter requires DC source for output voltage levels. In this paper, a scheme is proposed that allows the use of a single DC source as the first DC source which would be available from batteries or fuel cells, with the remaining () DC sources being capacitors. This scheme can simultaneously maintain the capacitors of DC voltage level and produce a nearly sinusoidal output voltage due to its high number of output levels. In this context, high performances and efficient torque and flux control are obtained, enabling a DTC solution for hybrid multilevel inverter powered induction motor drives intended for electric vehicle propulsion. Simulations and experiments show that the proposed multilevel inverter and control scheme are effective and very attractive for embedded systems such as automotive applications.

scholarly journals Modified Structure of Sepic Based Single-Phase Five-Level T-Type Inverter for Photovoltaic Applications

2019 ◽  
Vol 9 (1) ◽  
pp. 3852-3856 ◽  
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Prototype Model ◽  
Matlab Simulation ◽  
Voltage Level ◽  
High Frequency Transformer ◽  
Photovoltaic Applications ◽  
Quality Of Supply

In this paper, a modified structure of two-stage sepic based five-level T-type inverter is presented for photovoltaic applications. The proposed topology consists of a frond-end sepic converter cascaded with full bridge T-type inverter through a high-frequency transformer. The proposed topology owns the merits of high boost output voltage level, modularity, reduced device parts, and better quality of supply. Therefore, a detailed operation of the proposed topology and the level generations using sine pulse width modulation are presented. Finally, the performance of the proposed topology is validated through Matlab simulation and experimental prototype model results

SVPWM Control of Cascaded H-Bridge Multilevel Inverters

2012 ◽  
Vol 246-247 ◽  
pp. 797-800
Author(s):  
Zheng Lu ◽  
Ju Xian Chen
Keyword(s):  
Output Voltage ◽  
Control Algorithm ◽  
Pulse Width Modulation ◽  
Voltage Level ◽  
Multilevel Inverters ◽  
The Difference ◽  
Modulation Control ◽  
Drive Systems ◽  
Algorithm Base ◽  
Cascaded Multilevel Inverter

To solve the problem of computational complexity in H bridge cascaded multilevel inverter (HBCMI) control, this paper proposes a simple space vector pulse width modulation control algorithm. Base on the topology configuration of HBCMI, the output voltage is deduced, which is the difference value between two-level inverter group output voltage formed by left bridge arms and by right bridge arms. The control complexity is independent of inverter voltage level and it is suitable to every voltage level. To verify the algorithms, different level cascaded H-bridge inverter drive systems were constructed and simulation results are present.

scholarly journals Design of a New Duty Cycle Modulation to Improve the Energy Quality of an Insulated Production System

2021 ◽  
Vol 23 (4) ◽  
pp. 311-319
Author(s):  
Clément Kengnou Donfack ◽  
Charles Hubert Kom ◽  
Jean Jacques Mandeng ◽  
Félix Paune
Keyword(s):  
Duty Cycle ◽  
Pulse Width Modulation ◽  
Renewable Energy Sources ◽  
Control Technique ◽  
Three Phase ◽  
New Strategy ◽  
The One ◽  
Sinusoidal Pulse Width Modulation ◽  
Three Phase Inverter

In this article, we propose a new strategy for controlling three-phase inverters of renewable energy sources, based on the Duty Cycle Modulatiom (DCM) control using the Park and Fortescue transformation (DCM-dq-dih). Our goals in setting and using this strategy are, on the one hand, to induce a lower harmonic rate as compared to the SPWM (Sinusoidal Pulse Width Modulation) strategy and on the other hand, this control technique enables the inverter to deliver balanced voltages, be it in the event of load unbalance. Our design is built on the basis of the known mode of DCM control of single-phase inverters. Thus, the control of our three-phase inverter is carried out by three DCM modules whose set-points come from the direct, reverse and homopolar strings reconstructed in a Park landmark. This new strategy was tested on the MATLAB Simulink environment for a load of 160 kW. The test results show a reduced Total Harmonic Distorsion (THD) of 2.7 times compared to the THD produced by the SPWM control strategy. In addition, regulation of the symmetrical components during load unbalance is ensured so that the inverter always delivers constant and balanced voltages.

scholarly journals Automation of the development of electrodynamic objects based on the dual approach

2021 ◽  
Vol 2094 (2) ◽  
pp. 022017
Author(s):  
I Ya Lvovich ◽  
Ya E Lvovich ◽  
A P Preobrazhenskiy ◽  
Yu P Preobrazhenskiy ◽  
O N Choporov
Keyword(s):  
Wide Class ◽  
Electromagnetic Waves ◽  
Automated System ◽  
Structural Diagram ◽  
Dual Approach ◽  
Radiation Control ◽  
Operation Control ◽  
Technical Systems ◽  
And Control

Abstract This paper considers an approach that demonstrates the features of creating complex electrodynamic systems. In practice, the creation of such objects is associated with a decrease in the levels of electromagnetic radiation, control of the direction of propagation of electromagnetic waves. The main properties of the generated automated system for assessing the quality of the electrodynamic characteristics of objects are considered. Suggestions are given on its structural diagram, the contours of the operation control and control of the restructuring of electrodynamic objects are shown. The created system for assessing the quality of electrodynamic characteristics can be useful in the design of a wide class of technical systems.

Continuous PWM Modulation Strategy for NPC/H and H Bridge Hybrid Multilevel Converter

2013 ◽  
Vol 748 ◽  
pp. 510-513
Author(s):  
Hong Zheng ◽  
Yue Lei Shi ◽  
Hang Hui Zhang
Keyword(s):  
Control Strategy ◽  
Output Voltage ◽  
Supply Voltage ◽  
Matlab Simulation ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Voltage Variation ◽  
Slave Converter ◽  
And Control

f the ratio of NPC/H and H bridge hybrid multilevel converters DC supply voltage changed, the output voltage PWM waveform will be discontinuous. Thus an improved topology and control strategy is proposed. In new method, master converter operates at the fundamental frequency based on command voltage, slave converter adopts carrier phase shifted PWM technology (CPS-SPWM) at a higher frequency to enhance the quality of output voltage waveform. The amplitude of command voltage is higher than output voltage amplitude of the master converter at any time, to ensure that output voltage variation of both converters keeps in the same direction without any current flow backwards. Matlab simulation results demonstrate the effectiveness of the proposed control strategy and topology.

scholarly journals A New Asymmetrical MLI with Reduced Switch Count for a Three Phase Induction Motor

2020 ◽  
Vol 9 (7) ◽  
pp. 728-737
Keyword(s):  
Induction Motor ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Circulating Current ◽  
Three Phase ◽  
Power Switches ◽  
Frequency Components ◽  
Sinusoidal Shape ◽  
Bidirectional Switches

This work explores a novel multilevel inverter (MLI) topology to minimize the number of power switches in the passage of current to accomplish each level of the output voltage. The unequal magnitudes of the dc voltage sources in attempt to realize higher levels of the output voltage bring in the asymmetrical nature of operation. It involves a series parallel switched configuration with bidirectional switches to avert the flow of circulating current in between the two H - bridges in each phase of the MLI. The effort incites to use the theory of a new Pulse Width Modulation (PWM) strategy for mitigating the higher frequency components of the voltage applied to the stator. It imbibes the Phase Disposition (PD) principles in the modulating strategy for arriving at the sinusoidal shape for the output voltage . Total Harmonic Distortion (THD) indexed by lower values for the output voltage over the traditional firing scheme serves to be the highlight for the MLI in acclaiming its place in the inverter world. The results obtained through MATLAB based simulation over a range of modulation indices. The performance measured in terms of the THD claims its suitability for use in Induction Motor (IM) drives.

scholarly journals PERANCANGAN FLYBACK CONVERTER UNTUK CATU DAYA DRIVER MOTOR BLDC ( BRUSHLESS DIRECT CURRENT )

Foristek ◽  
2019 ◽  
Vol 9 (2) ◽  
Author(s):  
Agus Mahendra ◽  
Sapril Sapril ◽  
Maryantho Masarrang
Keyword(s):  
Direct Current ◽  
Duty Cycle ◽  
Power Supply ◽  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Modulation Method ◽  
Flyback Converter ◽  
Direct Current Motor ◽  
Brushless Direct Current Motor

Flyback Converter is an electronic circuit that can increase the output voltage value, the voltage value can be adjusted by changing the value of the duty cycle. This Flyback Converter will be controlled by the Pulse Width Modulation method as the output voltage setting and this research is equipped with a feedback function as monitoring and control of Input Pulse Width Modulation. This designed flyback converter aims to provide an isolated power supply as a power source for Brushless Direct Current Motor drivers, and this research was conducted to analyze how much power the flyback converter can produce to be able to supply Brushless Direct Current Motor drivers. The results of the analysis obtained in the research Design of flyback converter for power supply of BLDC (Brushless Direct Current) motor driver that is flyback converter is given an input voltage of 31 VDC and output voltage of 15 VDC, rheostat load with a capacity of 39 Ohm, a frequency of 31 KHz in the form of a box wave duty cycle reaches 70%. Flyback converter designed to produce maximum power of 49.6 watts on 70% duty cycle testing.

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