ANALYSIS OF A GENERALIZED SYMMETRICAL MULTILEVEL INVERTER

2011 ◽  
Vol 20 (02) ◽  
pp. 299-311 ◽  
Author(s):  
M. R. BANAEI ◽  
E. SALARY
Keyword(s):  
Control System ◽  
Drive System ◽  
Multilevel Inverter ◽  
Multilevel Converter ◽  
Dc Voltage ◽  
Ac Drive ◽  
Voltage Generation ◽  
Simulation Results ◽  
And Performance ◽  
Main Components

The cascade multilevel converter requires the least number of main components among traditional multilevel converter. In this paper, comparison of main components between proposed and traditional converter is shown. In addition, a generalized symmetrical multilevel inverter is proposed. The proposed multilevel inverter can generate DC voltage levels similar to other topologies with less number of components. The proposed topology results in reduction of installation area and cost and has simplicity of control system. This converter has been used in an AC drive system. The operation and performance of the proposed generalized multilevel converter has been verified by the simulation results using SIMULINK/MATLAB. The simulation results show its capability in voltage generation and speed control.

scholarly journals An enhanced 17-level hybridized multilevel inverter with stair case modulation

2020 ◽  
Vol 11 (4) ◽  
pp. 1872
Author(s):  
Hemalatha Javvaji ◽  
Basavaraja Banakara
Keyword(s):  
Renewable Energy ◽  
Solid State ◽  
Power Consumption ◽  
Output Voltage ◽  
Multilevel Inverter ◽  
Energy Applications ◽  
Multi Level ◽  
Simulation Results ◽  
And Performance ◽  
Cascaded Multilevel Inverter

This paper proposes a Hybridized Symmetric Cascaded Multilevel Inverter for voltage levels ranging from 5 levels to 17 levels. The proposed Multi Level Inverter (MLI) topology is built using a modified H-bridge inverter that results in an increased output voltage levels with a smaller number of solid-state switches. This technique enhances the h-bridge configuration from three level to five level by means of a bi-directional switch at source. Gating pulses of hybridized symmetric MLI are generated through staircase modulation. The operation and performance of the proposed topology is tested for different output voltage levels, simulation results prove that the proposed technique results in less THD at all levels with lesser power consumption and are easily applicable for renewable energy applications.

Cascading of Diode Clamped Multilevel Inverter Boosters for High Voltage Applications

2013 ◽  
Vol 313-314 ◽  
pp. 876-881
Author(s):  
M.R. Rashmi ◽  
B. Anu
Keyword(s):  
High Voltage ◽  
Power Converters ◽  
Photovoltaic Cells ◽  
Multilevel Inverter ◽  
Power Conditioning ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Energy Demands ◽  
Simulation Results ◽  
Cascaded Multilevel Inverter

Nonconventional energy sources are playing important role in meeting current power/energy demands. However these sources cannot provide High voltage/power. For power conditioning and voltage amplification solid state power converters are very much essential. One such approach to obtain high voltage was to use cascaded multilevel inverter but cascaded multilevel inverters require separate DC sources and they cannot be used for regenerative applications. To overcome these limitations, a novel configuration is using diode clamped multilevel inverter is proposed here. . The conditioned DC voltage from photovoltaic cells or fuel cells or batteries is boosted and inverted by means of multistage Multilevel Inverters (MLI). Three different configurations are presented in this paper. From the simulation results of all three configurations, the topology which is found to be better is implemented in the real time. A proto type is developed to boost 40 V input DC to 100 V AC and the experimental results for the same are presented.

Modelling and Simulation of a Sensorless Control of a True Asymmetric Cascade H-Bridge Multilevel Inverter PMSM Drives

2016 ◽  
Vol 7 (2) ◽  
pp. 397
Author(s):  
Kamel Saleh ◽  
Mark Sumner
Keyword(s):  
Harmonic Distortion ◽  
Modelling And Simulation ◽  
Multilevel Inverter ◽  
Current Response ◽  
Multilevel Converter ◽  
Ac Motor ◽  
Speed Range ◽  
Simulation Results ◽  
Level Converter ◽  
Wide Speed Range

This paper introduces a new method to track the saliency of an AC motor fed by a multilevel converter through measuring the dynamic current response of the motor line currents due the IGBT switching actions. The method uses only the fundamental PWM waveform (i.e there is no modification to the operation of the multilevel converter) similar to the fundamental PWM method proposed for a 2-level converter. Simulation results are provided to demonstrate the performance of the complete sensorless speed control of a PM motor driven by such a converter over a wide speed range. Finally the paper introduces a comparison between the 2-level converter and the multilevel converter in terms of the reduction of the Total Harmonic Distortion (THD) using the fundamental PWM method in both cases.

scholarly journals NEW ASYMMETRIC 21-LEVEL INVERTER WITH REDUCED NUMBER OF SWITCHES

2019 ◽  
Vol 16 (1) ◽  
pp. 18 ◽  
Author(s):  
Thiyagarajan V ◽  
Somasundaran P
Keyword(s):  
Power Electronics ◽  
High Voltage ◽  
High Power ◽  
Output Voltage ◽  
Multilevel Inverter ◽  
Matlab Simulink ◽  
Dc Voltage ◽  
Simulation Results ◽  
Commercial Applications ◽  
Inverter Topology

Multilevel inverter plays an important role in the field of modern power electronics and is widely being used for many high voltage and high power industrial and commercial applications. The objective of this paper is to design and simulate the modified asymmetric multilevel inverter topology with reduced number of switches. The proposed inverter topology synthesizes 21-level output voltage during symmetric operation using three DC voltage sources and twelve switches 8 main switches and 4 auxiliary switches. The different methods of calculating the switching angles are presented in this paper. The MATLAB/Simulink software is used to simulate the proposed inverter. The performance of the proposed inverter is analyzed and the corresponding simulation results are presented in this paper.

A Novel Three Phase Cascaded Multilevel Inverter

2013 ◽  
Vol 646 ◽  
pp. 249-258
Author(s):  
Sheng Wang ◽  
Jia Hua Zhong ◽  
Shao Dong Wang ◽  
Jin Ping He
Keyword(s):  
Control Strategy ◽  
Topological Structure ◽  
Output Voltage ◽  
Multilevel Inverter ◽  
Experimental Results ◽  
Phase System ◽  
Multilevel Converter ◽  
Three Phase ◽  
Simulation Results ◽  
Cascaded Multilevel Inverter

Based on the theory of H-bridge multilevel converter, the structure of a three phase cascaded multilevel inverter (LVCMI) and its control strategy are proposed in this paper. Several standard three-phase bridges can be reconnected into a new single three-phase bridge at ac-side. Simulation results show that such topological structure can increase the output voltage capacity and reduce the THD. It can be used as an inverter or rectifier in three phase system. In theory, it can be cascaded unlimitedly. The more cascaded, the higher output voltage and the lower THD. Experimental results of LVCMI with 3-module verified the feasibility of the proposed inverter.

scholarly journals A New Hybrid Multilevel Inverter Topology with Reduced Switch Count and dc Voltage Sources

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 977 ◽  
Author(s):  
Hussain Bassi ◽  
Zainal Salam
Keyword(s):  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Intermediate Step ◽  
Resistive Load ◽  
Inductive Load ◽  
Dc Voltage ◽  
Zero Level ◽  
Power Switches ◽  
In Series ◽  
And Performance

In this paper, a new single-phase hybrid multilevel inverter (MLI) is proposed. Compared to other existing MLI topologies, the proposed circuit is capable of producing a higher number of output voltage levels using fewer power switches and dc sources. The levels are synthesized by switching the dc voltage sources in series/parallel combinations. An auxiliary circuit is introduced to double the number of levels by creating an intermediate step in between two levels. In addition, a zero level is introduced to overcome the inherent absence of this level in the original circuit. To improve the total harmonic distortion, a hybrid modulation technique is utilized. The operation and performance of the circuit are analyzed and confirmed using MATLAB/Simulink simulation. To validate the workability of the proposed idea, a 300 W, a thirteen level MLI (including the zero level) is designed and constructed. The circuit is tested with a no-load, resistive load and resistive-inductive load. The experimental results match very closely with the simulation and mathematical analysis.

scholarly journals Research on Precharge Control Strategy of Modular Multilevel Inverter

2021 ◽  
Vol 261 ◽  
pp. 02039
Author(s):  
Chuanliang Fang ◽  
Guochu Chen
Keyword(s):  
Control Strategy ◽  
Multilevel Inverter ◽  
Modular Multilevel Converter ◽  
Simulation Environment ◽  
Multilevel Converter ◽  
Simple Analysis ◽  
Simulink Simulation ◽  
Working Principle ◽  
Simulation Results ◽  
The Mathematical Model

This paper mainly introduces the Modular Multilevel Converter (MMC) topology structure, simple analysis of the working principle of MMC, deduced the mathematical model of MMC. The precharging control strategy of MMC sub-module (SM) is studied, and the charging process is divided into uncontrollable charging stage and controllable charging stage. For the uncontrollable charging stage, an improved DC side pre-charging method is proposed, and a five-level simulation model of voltage-type MMC is established in the Matlab/Simulink simulation environment, and the simulation results of the system are comprehensively analyzed.

A controller for safe, convenient operation of LaB6 emitters on electron-beam instruments

1983 ◽  
Vol 41 ◽  
pp. 408-409
Author(s):  
W. J. Abramson ◽  
H. W. Estry ◽  
L. F. Allard
Keyword(s):  
Electron Beam ◽  
Control System ◽  
Thermal Shock ◽  
Appropriate Care ◽  
Electron Guns ◽  
Tungsten Filaments ◽  
Order Of Magnitude ◽  
Main Components

LaB6 emitters are becoming increasingly popular as direct replacements for tungsten filaments in the electron guns of modern electron-beam instruments. These emitters offer order of magnitude increases in beam brightness, and, with appropriate care in operation, a corresponding increase in source lifetime. They are, however, an order of magnitude more expensive, and may be easily damaged (by improper vacuum conditions and thermal shock) during saturation/desaturation operations. These operations typically require several minutes of an operator's attention, which becomes tedious and subject to error, particularly since the emitter must be cooled during sample exchanges to minimize damage from random vacuum excursions. We have designed a control system for LaBg emitters which relieves the operator of the necessity for manually controlling the emitter power, minimizes the danger of accidental improper operation, and makes the use of these emitters routine on multi-user instruments.Figure 1 is a block schematic of the main components of the control system, and Figure 2 shows the control box.

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