JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Electronics

Course Objectives:

• To understand various advanced power electronic devices.
• To comprehend the design of rectifiers and inverters.
• To understand the operation of multi-level inverters with switching strategies for high power applications.

Course Outcomes

After completion of the course, students will be able to:

• Develop and analyze various converter topologies.
• Use power electronic simulation packages for analyzing and designing power converters.

UNIT - I

MODERN POWER SEMICONDUCTOR DEVICES Modern power semiconductor devices: Symbol, Structure and equivalent circuit of Insulated Gate Bipolar Transistor (IGBT), MOSFET, MOS Turn off Thyristor (MTO), Emitter Turn off Thyristor (ETO), Integrated Gate-Commutated Thyristor (IGCTs), MOS-controlled thyristors (MCTs), Power Integrated Circuits (PICs). Comparison of their features.

UNIT - II

SINGLE PHASE & THREE PHASE CONVERTERS Single phase converters: Half controlled and Fully controlled converters, Evaluation of input power factor and harmonic factor, continuous and Discontinuous load current, Single phase dual converters, Power factor Improvements Techniques, Extinction angle control, Symmetrical angle control, Single phase sinusoidal PWM, Single phase series converters, Overlap analysis, Applications & Problems. Three phase converters: Half controlled and fully controlled converters, Evaluation of input power factor and harmonic factor, Continuous and Discontinuous load current, Three phase dual converters, Power factor Improvements Techniques, Three phase PWM, Twelve pulse converters, Applications &Problems.

UNIT - III

PULSE WIDTH MODULATED INVERTERS Principle of operation, Performance parameters, Single phase bridge inverter, Evaluation of output voltage and current with resistive, inductive and capacitive loads, Voltage control of single phase inverters, Single PWM, Multiple PWM, Sinusoidal PWM, Modified PWM, Phase displacement Control, Advanced modulation techniques for improved performance, Trapezoidal, Staircase, Stepped, Harmonic injection and Delta modulation, Advantages, Applications & Problems.

UNIT - IV

THREE PHASE INVERTERS Introduction to Three phase inverter, Analysis of 180 degree conduction for output voltage And current with resistive, inductive loads, Analysis of 120 degree Conduction, Voltage control of three phase inverters, Sinusoidal PWM, Third Harmonic PWM, 60 degree PWM, Space vector modulation, Comparison of PWM techniques, Harmonic reductions, Problems.

UNIT - V

MULTILEVEL INVERTERS Multilevel concept, Classification of multilevel inverters, Principle of operation, main features and comparison of Diode clamped, Improved diode Clamped, Flying capacitors, Cascaded multilevel inverters, Multilevel inverter applications, Reactive power compensation, Back to back intertie system, Adjustable drives, Switching device currents, DC link capacitor voltage balancing.

TEXTBOOKS:

• 1. Mohammed H. Rashid, “Power Electronics”, Pearson Education, 3rd Edition, 1st Indian reprint 2004.
• 2. Ned Mohan Tore M. Undeland and William P. Robbins, “Power Electronics”, John Wiley & Sons, 2nd Edition.

REFERENCES:

• 1. Milliman Shepherd and Lizang, “Power converters circuits”, Chapter 14 (Matrix converter) PP- 415-444,
• 2. M.H.Rashid, “Power Electronics hand book”.
• 3. Marian P. Kaźmierkowski, Ramu Krishnan, Frede Blabjerg Edition, “Control in Power electronics”, Published by Academic Press, 2002. M. Tech – I Semester L T P C 3 0 0 3