Pulse width Modulation for Power Electronic Converters
About Course
Pulse width Modulation for Power Electronic Converters. Converter topologies for AC/DC and DC/AC power conversion, an overview of applications of voltage source converters; pulsewidth modulation techniques for 1phase and 3phase bridge converters, sinetriangle Pulse width Modulation, bus clamping PWM, space vector based PWM, advanced PWM techniques; calculation of switching and conduction losses; compensation for dead time and DC voltage regulation; estimation of current ripple and torque ripple in inverter fed drives; overmodulation; extension of modulation methods to multilevel inverters.
Pulse width Modulation for Power Electronic Converters Detailed syllabus:
1. Power electronic converters for dcac and acdc power conversion (6 lectures).
Electronic switches, dcdc buck and boost converters, Hbridge, multilevel converters – diode clamp, flying capacitor, and cascadedcell converters; voltage source and current source converters; the evolution of topologies for dcac power conversion from dcdc converters.
2. Applications of voltage source converters (2 lectures).
Overview of applications of voltage source converter, motor drives, active frontend converters, reactive compensators, active power filters
3. Purpose of pulse width modulation (2 lectures).
Review of Fourier series, fundamental and harmonic voltages; machine model for harmonic voltages; undesirable effects of harmonic voltages – line current distortion, increased losses, pulsating torque in motor drives; control of fundamental voltage; mitigation of harmonics and their adverse effects
4. Pulsewidth modulation (PWM) at low switching frequency (3 lectures).
Square wave operation of voltage source inverter, PWM with a few switching angles per quarter cycle, equal voltage contours, selective harmonic elimination, THD optimized PWM, offline PWM
5. Trianglecomparisonbased PWM (4 lectures).
Average pole voltages, sinusoidal modulation, third harmonic injection, continuous PWM, busclamping, or discontinuous PWM
6. Space vectorbased PWM (4 lectures).
Space vector concept and transformation, perphase methods from a space vector perspective, space vectorbased modulation, conventional space vector PWM, busclamping PWM, advanced PWM, triangle comparison approach versus space vector approach to PWM
7. Analysis of line current ripple (4 lectures).
Synchronously revolving reference frame; error between the reference voltage and applied voltage, integral of voltage error; evaluation of line current ripple; hybrid PWM for reduced line current ripple
8. Analysis of dc link current (2 lectures).
The relation between lineside currents and dclink current; dclink current and inverter state; RMS DC ripple over a carrier cycle; RMS current rating of dc capacitors
9. Analysis of torque ripple (2 lectures).
Evaluation of harmonic torques and RMS torque ripple, hybrid PWM for reduced torque ripple
10. Inverter loss (3 lectures).
Simplifying assumptions in the evaluation of inverter loss, the dependence of inverter loss on line power factor, the influence of PWM techniques on switching loss, design of PWM for low inverter loss.
11. Effect of inverter deadtime effect (2 lectures).
The requirement of deadtime, the effect of deadtime on line voltages, dependence on power factor and modulation method, compensation of deadtime effect.
12. Overmodulation (3 lectures).
Perphase and space vector approaches to overmodulation, average voltages in asynchronously revolving dq reference frame, lowfrequency harmonic distortion
13. Pulse width Modulation for multilevel inverter (3 lectures).
Extensions of sinetriangle PWM to multilevel inverters, voltage space vectors, space vector based PWM, analysis of line current ripple, and torque ripple
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Course Content
Pulse width Modulation for Power Electronic Converters

Mod01 Lec01 Electronic switches
57:55 
Mod01 Lec02 DC — DC converters
00:00 
Mod01 Lec03 DC — AC converters
00:00 
Mod01 Lec04 Multilevel converters – I
00:00 
Mod01 Lec05 Multilevel converters – II
00:00 
Mod02 Lec06 Applications of voltage source converter — I
00:00 
Mod02 Lec07 Applications of voltage source converter — II
00:00 
Mod02 Lec08 Applications of voltage source converter — III
00:00 
Mod03 Lec09 Purpose of PWMI
00:00 
Mod03 Lec10 Purpose of PWMII
00:00 
Mod04 Lec11 Low switching frequency PWM – I
00:00 
Mod04 Lec12 Low switching frequency PWM — II
00:00 
Mod04 Lec13 Selective harmonic elimination
00:00 
Mod04 Lec14 Offline optimized pulsewidth modulation
00:00 
Mod05 Lec15 Sinetriangle pulse width modulation
00:00 
Mod05 Lec16 Harmonic injection pulse width modulation
00:00 
Mod05 Lec17 Busclamping pulse width modulation
00:00 
Mod05 Lec18 Trianglecomparison based PWM for threephase inverter
00:00 
Mod06 Lec19 Concept of space vector
00:00 
Mod06 Lec20 Conventional space vector PWM
00:00 
Mod06 Lec21 Space vector based busclamping PWM
00:00 
Mod06 Lec22 Space vector based advanced busclamping PWM
00:00 
Mod07 Lec23 Harmonic analysis of PWM techniques
00:00 
Mod07 Lec24 Analysis of RMS line current ripple using the notion of stator flux ripple
00:00 
Mod07 Lec25 Evaluation of RMS line current ripple using the notion of stator flux ripple
00:00 
Mod07 Lec26 Analysis and design of PWM techniques from line current ripple perspective
00:00 
Mod08 Lec27 Instantaneous and average dc link current in a voltage source inverter
00:00 
Mod08 Lec28 DC link current and DC capacitor current in a voltage source inverter
00:00 
Mod09 Lec29 Analysis of torque ripple in induction motor drives – I
00:00 
Mod09 Lec30 Analysis of torque ripple in induction motor drives – II
00:00 
Mod10 Lec31 Evaluation of conduction loss in threephase inverter
00:00 
Mod10 Lec32 Evaluation of switching loss in threephase inverter
00:00 
Mod10 Lec33 Design of PWM for reduced switching loss in threephase inverter
00:00 
Mod11 Lec34 Effect of deadtime on inverter output voltage for continuous PWM schemes
00:00 
Mod11 Lec35 Effect of deadtime on inverter output voltage for busclamping PWM schemes
00:00 
Mod12 Lec36 Analysis of overmodulation in sinetriangle PWM from space vector perspective
00:00 
Mod12 Lec37 Overmodulation in space vector modulated inverter
00:00 
Mod13 Lec38 PWM for threelevel neutralpointclamped inverter — I
00:00 
Mod13 Lec39 PWM for threelevel neutralpointclamped inverter – II
00:00 
Mod13 Lec40 PWM for threelevel neutralpointclamped inverter – III
00:00