Pulse width Modulation for Power Electronic Converters

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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.

Course Curriculum

Electronic switches Details 57:56
DC — DC converters Details 54:6
DC — AC converters Details 57:57
Multilevel converters – I Details 56:14
Multilevel converters – II Details 57:28
Applications of voltage source converter — I Details 56:6
Applications of voltage source converter — II Details 56:53
Applications of voltage source converter — III Details 55:49
Purpose of PWM-I Details 57:47
Purpose of PWM-II Details 57:8
Low switching frequency PWM – I Details 59:18
Low switching frequency PWM — II Details 57:19
Selective harmonic elimination Details 58:29
Off-line optimized pulsewidth modulation Details 58:35
Sine-triangle pulsewidth modulation Details 58:36
Harmonic injection pulsewidth modulation Details 57:35
Bus-clamping pulsewidth modulation Details 58:15
Triangle-comparison based PWM for three-phase inverter Details 57:1
Concept of space vector Details 57:8
Conventional space vector PWM Details 58:46
Space vector based bus-clamping PWM Details 59:17
Space vector based advanced bus-clamping PWM Details 59:33
Harmonic analysis of PWM techniques Details 58:40
Analysis of RMS line current ripple using the notion of stator flux ripple Details 59:15
Evaluation of RMS line current ripple using the notion of stator flux ripple Details 59:20
Analysis and design of PWM techniques from line current ripple perspective Details 59:8
Instantaneous and average dc link current in a voltage source inverter Details 58:1
DC link current and DC capacitor current in a voltage source inverter Details 59:7
Analysis of torque ripple in induction motor drives – I Details 57:53
Analysis of torque ripple in induction motor drives – II Details 58:11
Evaluation of conduction loss in three-phase inverter Details 58:23
Evaluation of switching loss in three-phase inverter Details 58:19
Design of PWM for reduced switching loss in three-phase inverter Details 58:55
Effect of dead-time on inverter output voltage for continuous PWM schemes Details 59:8
Effect of dead-time on inverter output voltage for bus-clamping PWM schemes Details 59:35
Analysis of overmodulation in sine-triangle PWM from space vector perspective Details 59:14
Overmodulation in space vector modulated inverter Details 59:42
PWM for three-level neutral-point-clamped inverter — I Details 59:47
PWM for three-level neutral-point-clamped inverter – II Details 0:1
PWM for three-level neutral-point-clamped inverter – III Details 59:50

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