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A New Hybrid Multi Level Inverter to Improve the Performance of Induction Motor ABSTRACT: The Multi-level Inverter (MLI) drew due importance in medium and high voltage applications. Various conventional topologies have been proposed for the realization of MLIs. However, they suffer from disadvantages such as requirement of more number of components which further increases the complexity to generate control signals and hence the overall cost. To overcome the above disadvantages, a hybrid topology has been proposed in this paper. The performance of the proposed method is compared with the neutral point clamped topology in MATLABSIMULINK environment. The result illustrates the reduction in components required, reduction of complexity of control signals design and improvement in the speed of induction motor
KEYWORDS: 1.Multi-level inverter 2. topologies 3. control signals 4.performance of induction motor.
SOFTWARE: MATLAB/SIMULINK
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BLOCK DIAGRAM:
Fig.l. Block diagram of three phase N-level hybrid multilevel inverter
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EXPECTED SIMULATION RESULTS:
Fig.2. Simulation diagram of NPC topology
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Fig.3. Simulation diagram of Hybrid topology
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Fig.4. Output voltage of NPC topology
Fig.5. Frequency spectrum of NPC topology
Fig.6. Frequency spectrum of Hybrid topology
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Fig.7. Stator currents comparison
Fig.8 Electromagnetic torque comparison
CONCLUSION: The simulation of HMLI topology has been developed in MA TLAB Simulink environment. From the results it can be concluded that the HMLI topology reduces not only the components required for the realization of the inverter, but also decreases the complexity in designing the control circuit. Thus hybrid topology also minimizes the Total Harmonic Distortion (THD) in the output voltage which further reduces the pulsation in the torque
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0-9347143789/9949240245 REFERENCES: [I]. L. G. Franquelo, J. L. Rodriguez, 1. Leon, S. Kouro, R. Portillo, and M. A. Prats, " The age of multilevel converters arrives," iEEE ind. Electron. Mag., vol.2, no. 2, pp. 28-39, Jun. 2008. [2]. J. Rodriguez, J.-S. Lai, and F. Z. Peng, "Multilevel inverters: A survey of topologies, controls, and applications," iEEE Trans. ind. Electro, vol. 49, no. 4, pp. 724-738, Aug. 2002. [3]. M. Marchesoni and P. Tenca, "Diode-Clamped multilevel converters: A practicable way to balance dc-link voltages," iEEE Trans. ind. Electron., Vol. 49, no. 4, pp. 752-765, Aug. 2002. [4]. J. Rodriguez, S. Bernet, B. Wu, 1. O. Pont! and S. Kouro, "Multilevel voltage-sourceconverter topologies for industrial medium-voltage drives," iEEE Trans. ind. Electro., vol. 54, no. 6, pp. 2930-2945, Dec. 2007. [5]. M. Zahra, M. Jafari, Md. R. Islam and 1. Zhu, "A comparative study on characteristics of major topologies of voltage source multilevel inverters," iEEE innovative Smart Grid Tech., pp. 612-617, 2014
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