scholarly journals Microcontroller Based Flexible Modulation Scheme of MLI Operation for Selective Lower Levels: A Knowledge Based Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
R. K. Dhatrak ◽  
R. K. Nema ◽  
D. M. Deshpande
Keyword(s):  
Pulse Generation ◽  
Multilevel Inverter ◽  
Experimental Results ◽  
Modulation Scheme ◽  
Inductive Load ◽  
Medium Voltage ◽  
Knowledge Based ◽  
Common Mode Voltage ◽  
Power Modules ◽  
And Performance

In today’s industrial world multilevel inverter (MLI) got a significant importance in medium voltage application and also a very potential topic for researchers. It is experienced that studying and comparing results of multilevel inverter (MLI) at distinct levels are a costlier and time consuming issue for any researcher if he fabricate different inverters for each level, as designing power modules simultaneously for different level is a cumbersome task. In this paper a flexible quotient has been proposed to recognize possible conversion of available MLI to few lower level inverters by appropriately changing microcontroller programming. This is an attempt to obtain such change in levels through simulation using MATLAB Simulink on inductive load which may also be applied to induction motor. Experimental results of pulse generation using dsPIC33EP256MC202 demonstrate the feasibility of proposed scheme. Proposed flexible quotient successfully demonstrates that a five-level inverter may be operated as three and two levels also. The paper focuses on odd levels only as common mode voltage (CMV) can be reduced to zero and performance of drives is better than even level. Simulated and experimental results are given in paper.

IMPLEMENTATION OF MULTI TRANSFORMER CELL INVERTER WITH REDUCED SWITCHES IN LAST CELL

2013 ◽  
Vol 22 (03) ◽  
pp. 1350003 ◽  
Author(s):  
M. R. BANAEI ◽  
H. KHOUNJAHAN ◽  
E. SALARY
Keyword(s):  
Multilevel Inverter ◽  
Experimental Results ◽  
And Performance

This paper proposes an isolated multi transformer cell inverter employing several transformer cells. Some of the cells contain two unidirectional switches that generate two voltage levels and only last cell has five switches that provide five voltage levels. The proposed inverter configuration reduces a number of switches compared with both traditional cascaded transformer multilevel inverter and other multi transformer inverters including six switches in last cell. Also, a prototype has been implemented using DSP-based processor provides a high number of output levels in symmetric and asymmetric states. The operation and performance of the suggested inverter has been proved by simulation result and experimental results.

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 A SPACE VECTOR PWM SCHEME FOR NEUTRAL POINT CLAMPED MULTILEVEL INVERTERS

2013 ◽  
pp. 71-75
Author(s):  
SRIHARIRAO NAMBALLA ◽  
T VAMSEE KIRAN
Keyword(s):  
High Power ◽  
High Performance ◽  
Pulse Width Modulation ◽  
Control Variable ◽  
Multilevel Inverter ◽  
Space Vector ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Common Mode Voltage ◽  
Selection Of

Multilevel inverters are increasingly being used in high power medium voltage applications when compared to two level inverter due to their merits, such as lower common mode voltage, lower dv/dt, lower harmonics in output voltage and current. Among various modulation techniques for a multilevel inverter, space vector pulse width modulation is poplar due to the merits like, it directly uses the control variable given by the control system and identifies each switching vector as a point in complex space. However the implementation of the SVPWM for a multilevel inverter is complicated. The complexity is due to the difficulty in determining the location of the reference vector, the calculations of on times and the determination and selection of switching states. The multilevel SVPWM method uses the concepts of two level modulations to calculate the on times of an n-level inverter. Use of multilevel inverters has become popular for motor drive applications. Various topologies and modulation strategies will be studied from the available literature. This work is devoted to the study and simulation of a new NPC multilevel inverter system typically suitable for high-performance high-power applications. Simulation of this work will be done in MATLAB/Simulink .

The Contingent Effect of Team Composition on the Performance of Entrepreneurial Teams

2019 ◽  
pp. 654-680
Author(s):  
Serghei Musaji ◽  
Julio De Castro
Keyword(s):  
Future Research ◽  
Team Composition ◽  
Team Members ◽  
Team Diversity ◽  
Entrepreneurial Teams ◽  
Knowledge Based ◽  
Fertile Ground ◽  
Active Debate ◽  
And Performance ◽  
The Relationship

Despite the continuous interest in studying entrepreneurial teams, the relationship between team composition and, particularly, team diversity and performance remains fertile ground for active debate. Taking roots in the knowledge-based view and organizational learning literatures, this chapter argues that performance in entrepreneurial teams is contingent on (a) the overlap between team members’ knowledge/competences and the content of the performed tasks, (b) the duplication of the team members’ knowledge in the areas with that content, (c) the nature of tasks (exploration or exploitation), (d) the team’s flexibility to adapt to changes in the content and nature of those tasks, and (e) the rate of environmental change. Because an important source of ambiguity in the understanding of how team diversity and performance are linked ties to issues of how team diversity is conceptualized and operationalized, the chapter also proposes a new way of looking at diversity in future research.

Platform Independent Analysis of Probabilities on Multithreaded Programs

2013 ◽  
Vol 1 (3) ◽  
pp. 48-65
Author(s):  
Yuting Chen
Keyword(s):  
Operating System ◽  
Static Analysis ◽  
Main Idea ◽  
Experimental Results ◽  
Machine To Machine ◽  
Concurrent Program ◽  
Acceptable Accuracy ◽  
Multithreaded Programs ◽  
Independent Analysis ◽  
And Performance

A concurrent program is intuitively associated with probability: the executions of the program can produce nondeterministic execution program paths due to the interleavings of threads, whereas some paths can always be executed more frequently than the others. An exploration of the probabilities on the execution paths is expected to provide engineers or compilers with support in helping, either at coding phase or at compile time, to optimize some hottest paths. However, it is not easy to take a static analysis of the probabilities on a concurrent program in that the scheduling of threads of a concurrent program usually depends on the operating system and hardware (e.g., processor) on which the program is executed, which may be vary from machine to machine. In this paper the authors propose a platform independent approach, called ProbPP, to analyzing probabilities on the execution paths of the multithreaded programs. The main idea of ProbPP is to calculate the probabilities on the basis of two kinds of probabilities: Primitive Dependent Probabilities (PDPs) representing the control dependent probabilities among the program statements and Thread Execution Probabilities (TEPs) representing the probabilities of threads being scheduled to execute. The authors have also conducted two preliminary experiments to evaluate the effectiveness and performance of ProbPP, and the experimental results show that ProbPP can provide engineers with acceptable accuracy.

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