Comparative Study Of Different Pwm Strategies

2649 Words Aug 17th, 2015 11 Pages
Comparative study of different PWM Strategies for Three Phase three-level Diode Clamped Multi-level Inverter

M. Satyanarayana
Research Assistant
Department of Electrical Engineering
University College of Engineering
Osmania University
Hyderabad, Telangana, INDIA

D. Naveen Kumar
Associate Professor
Department of Electrical and Electronics Engineering
Guru Nanak Institutions Technical campus
Hyderabad, Telangana, INDIA Abstract— This paper presents unipolar pulse width modulation technique with sinusoidal sampling and Space vector pulse width modulation are analyzed for three-phase Diode clamped multi-level inverter from the point of view of the Phase voltages, currents, voltage across the split capacitors and Total harmonic distortion. The necessary calculations for generation of PWM for the two modulation strategies have presented in detail. It is observed that the unipolar modulation ensures excellent, close to optimized pulse distribution results but THD is high compared to SVPWM. Theoretical investigations were confirmed by the digital simulations using MATLAB/SIMULINK software.
Keywords— Three-level diode clamped inverter; unipolar PWM; SVPWM; THD; INTRODUCTION
In the region of high voltage and power, a high quality inverter fed ac drive is more easily obtained by the use of multi-level and in the first turn of three-level - inverters. The neutral point clamped three-level inverter topology is presented in Figure.1. Several PWM methods for this inverter have…
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