# Pulse width Modulation for Power Electronic Converters

IISc Bangalore, , Prof. G. Narayanan

IISc Bangalore, , Prof. G. Narayanan

Contents:

Overview of power electronic converters : Electronic switches - DC - DC converters - DC - AC voltage source inverter - Voltage source and current source inverters - Multilevel inverter - diode clamped inverter - Multilevel inverter - flying capacitor inverter.

Applications of voltage source converter : Applications of voltage source converter I (motor drives, active rectifiers) - Applications of voltage source converter II (reactive current and harmonic compensation).

Purpose of pulsewidth modulation (PWM) : Review of Fourier series - Harmonic voltages and their undesirable effects.

Pulsewidth modulation at low switching frequency : Low switching frequency operation of a VSI I (square wave operation, one switching angle per quarter) - Low switching frequency operation of a VSI II (Two switching angles per quarter) - Selective harmonic elimination and THD optimized PWM.

Triangle-comparison based PWM : Sine-triangle modulation - Third harmonic injection PWM (THIPWM) - Bus-clamping PWM

Space vector-based PWM : Concept of space vector - Conventional space vector PWM and bus-clamping PWM - A unified perspective of triangle-comparison and space vector based PWM - Advanced bus-clamping PWM.

Analysis of line current ripple : Transformation from stationary reference frame to synchronously revolving dq reference frame - Volt-second balance and instantaneous error voltage - Calculation of RMS line current ripple - Space vector-based hybrid PWM for reduced line current ripple.

Analysis of dc link current : Inverter state and dc link current - Average and RMS values of dc link current.

Analysis of torque ripple : Calculation of harmonic torques and RMS torque ripple - Hybrid PWM techniques to reduce ripple torque.

Inverter loss : Evaluation of conduction loss - Dependence of switching loss on power factor and modulation method - PWM techniques for reduced switching loss.

Effect of inverter dead-time : Effect of dead-time with continuous modulation - Effect of dead-time with discontinuous or bus-clamping PWM.

Overmodulation : Per-phase approach to overmodulation - Space vector approach to overmodulation - A perspective from the synchronously revolving d-q reference frame.

PWM for multilevel inverters : Extension of sine-triangle modulation to three-level inverters - Extension of conventional space vector modulation to three-level inverters - Analysis of line current ripple and torque ripple.

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4.1 ( 11 )

Pulse width Modulation for Power Electronic Converters by Dr. G. Narayanan,Department of Electrical Engineering,IISc Bangalore.For more details on NPTEL visit httpnptel.ac.in

Sam

Sep 12, 2018

Excellent course helped me understand topic that i couldn't while attendinfg my college.

Dembe

March 29, 2019

Great course. Thank you very much.