Abstract: In This paper proposes the concepts of seven and nine levels multilevel inverter for energy saving in induction motor drives for variable torque load (VTL) application. The main objective here is to analyze the seven level and nine level diode clamped multilevel inverter for control the speed of an induction motor with respect to their variable loads. To give high quality sinusoidal input voltage with reduced harmonics to IMD( Induction motor Drive) The proposed Scheme for diode clamped multilevel inverter is multicarrier SPWM(sinusoidal pulse width modulation) control. The V/f technique is used to obtain an open loop speed control. This method can be implemented by changing the supply voltage and frequency applied to the three phase induction motor at constant ratio. The proposed method (7-Level MI) are an effective replacement for the conventional method which has high switching losses, as a result a poor drive performance. The 9-level multilevel inverter having better performance than 7-level multilevel inverter. According to the simulation results point of view the effective control in the motor speed and an enhanced drive performance through reduction in total harmonic distortion (THD) with 9 level is optimum. The effectiveness of the system is verified through simulation using MATLAB SIMULINK 7.8.0.347(R2009a) package.
Keywords: Diode clamped multilevel inverter; Sinusoidal Pulse Width Modulation; Induction motor; Multicarrier PWM technique; THD; V/ƒ method.
Title: Analysis of Seven and Nine Levels Multilevel Inverters for Energy Saving in Induction Motor Drive for VTL Application
Author: Mr. V. Praveen, Mr. A. V. Suresh
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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