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Pulse width Modulation for Power Electronic Converters

  • Course level: Intermediate

Description

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; pulse-width modulation techniques for 1-phase and 3-phase bridge converters, sine-triangle 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 dc-ac and ac-dc power conversion (6 lectures).

Electronic switches, dc-dc buck and boost converters, H-bridge, multilevel converters – diode clamp, flying capacitor, and cascaded-cell converters; voltage source and current source converters; the evolution of topologies for dc-ac power conversion from dc-dc converters.

2. Applications of voltage source converters (2 lectures).

Overview of applications of voltage source converter, motor drives, active front-end 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, off-line PWM

5. Triangle-comparison-based PWM (4 lectures).

Average pole voltages, sinusoidal modulation, third harmonic injection, continuous PWM, bus-clamping, or discontinuous PWM

6. Space vector-based PWM (4 lectures).

Space vector concept and transformation, per-phase methods from a space vector perspective, space vector-based modulation, conventional space vector PWM, bus-clamping 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 line-side currents and dc-link current; dc-link 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 dead-time effect (2 lectures).

The requirement of dead-time, the effect of dead-time on line voltages, dependence on power factor and modulation method, compensation of dead-time effect.

12. Overmodulation (3 lectures).

Per-phase and space vector approaches to overmodulation, average voltages in asynchronously revolving d-q reference frame, low-frequency harmonic distortion

13. Pulse width Modulation for multilevel inverter (3 lectures).

Extensions of sine-triangle PWM to multilevel inverters, voltage space vectors, space vector based PWM, analysis of line current ripple, and torque ripple

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What Will I Learn?

  • 1. Power electronic converters for dc-ac and ac-dc power conversion
  • 2. Applications of voltage source converters
  • 3. Purpose of pulse width modulation
  • 4. Pulsewidth modulation (PWM) at the low switching frequency
  • 5. Triangle-comparison based PWM
  • 6. Space vector based PWM
  • 7. Analysis of line current ripple
  • 8. Analysis of dc link current
  • 9. Analysis of torque ripple
  • 10. Inverter loss
  • 11. Effect of inverter dead-time effect
  • 12. Overmodulation
  • 13. PWM for multilevel inverter

Topics for this course

40 Lessons

Pulse width Modulation for Power Electronic Converters

Mod-01 Lec-01 Electronic switches00:00:00
Mod-01 Lec-02 DC — DC converters00:00:00
Mod-01 Lec-03 DC — AC converters00:00:00
Mod-01 Lec-04 Multilevel converters – I00:00:00
Mod-01 Lec-05 Multilevel converters – II00:00:00
Mod-02 Lec-06 Applications of voltage source converter — I00:00:00
Mod-02 Lec-07 Applications of voltage source converter — II00:00:00
Mod-02 Lec-08 Applications of voltage source converter — III00:00:00
Mod-03 Lec-09 Purpose of PWM-I00:00:00
Mod-03 Lec-10 Purpose of PWM-II00:00:00
Mod-04 Lec-11 Low switching frequency PWM – I00:00:00
Mod-04 Lec-12 Low switching frequency PWM — II00:00:00
Mod-04 Lec-13 Selective harmonic elimination00:00:00
Mod-04 Lec-14 Off-line optimized pulsewidth modulation00:00:00
Mod-05 Lec-15 Sine-triangle pulse width modulation00:00:00
Mod-05 Lec-16 Harmonic injection pulse width modulation00:00:00
Mod-05 Lec-17 Bus-clamping pulse width modulation00:00:00
Mod-05 Lec-18 Triangle-comparison based PWM for three-phase inverter00:00:00
Mod-06 Lec-19 Concept of space vector00:00:00
Mod-06 Lec-20 Conventional space vector PWM00:00:00
Mod-06 Lec-21 Space vector based bus-clamping PWM00:00:00
Mod-06 Lec-22 Space vector based advanced bus-clamping PWM00:00:00
Mod-07 Lec-23 Harmonic analysis of PWM techniques00:00:00
Mod-07 Lec-24 Analysis of RMS line current ripple using the notion of stator flux ripple00:00:00
Mod-07 Lec-25 Evaluation of RMS line current ripple using the notion of stator flux ripple00:00:00
Mod-07 Lec-26 Analysis and design of PWM techniques from line current ripple perspective00:00:00
Mod-08 Lec-27 Instantaneous and average dc link current in a voltage source inverter00:00:00
Mod-08 Lec-28 DC link current and DC capacitor current in a voltage source inverter00:00:00
Mod-09 Lec-29 Analysis of torque ripple in induction motor drives – I00:00:00
Mod-09 Lec-30 Analysis of torque ripple in induction motor drives – II00:00:00
Mod-10 Lec-31 Evaluation of conduction loss in three-phase inverter00:00:00
Mod-10 Lec-32 Evaluation of switching loss in three-phase inverter00:00:00
Mod-10 Lec-33 Design of PWM for reduced switching loss in three-phase inverter00:00:00
Mod-11 Lec-34 Effect of dead-time on inverter output voltage for continuous PWM schemes00:00:00
Mod-11 Lec-35 Effect of dead-time on inverter output voltage for bus-clamping PWM schemes00:00:00
Mod-12 Lec-36 Analysis of overmodulation in sine-triangle PWM from space vector perspective00:00:00
Mod-12 Lec-37 Overmodulation in space vector modulated inverter00:00:00
Mod-13 Lec-38 PWM for three-level neutral-point-clamped inverter — I00:00:00
Mod-13 Lec-39 PWM for three-level neutral-point-clamped inverter – II00:00:00
Mod-13 Lec-40 PWM for three-level neutral-point-clamped inverter – III00:00:00
Pulse width Modulation for Power Electronic Converters
Free

Enrolment validity: Lifetime

Requirements

  • Power electronics system