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Control of Electric Drives

Introduction: Electro-mechanical energy conversion, classification of electric drives,requirements of electric drives, four quadrant operation, selection of motors for different applications.

DC Motor Drives:DC-DC Converter fed drives, basic concepts, closed loop control, stability.

Asynchronous Motor Drives: Modeling of induction motors, reference frame theory, speed-torque characteristics, scalar control of induction motors, closed-loop operation, vector control and field orientation, sensor- less control, direct torque and flux control.

Real-time Controllers for Power Apparatus Lab

Filter implementation: Nth order IIR filter implementation, time constant relationship with sam- pling times, Nth order FIR filter implementation, memory requirements for filters, Sapling and quantization errors, outputs for different input signals.

Controllers (simulated plant): Implementation of a P controller, implementation of an I control- ler,implementation of a PI controller, implementation of a 2 DOF controller.

Advanced Power Electronics Lab - II

Familiarization of inverter modules architecture.

DC motor speed control - Speed control of DC motor with H-bridge using PWM.

Optional: Cascaded control of DC motor with inner current loop, and outer speed loop

V/f control of induction motor, sine PWM and Space vector PWM implementation with a 3- phase converter

Implementation of a single-phase PLL and a 3-phase PLL with hall-effect based voltage sen- sors and digital controllers

Analysis, Circuit design, schematics and layout of a 1-phase or a 3-phase 2-level inverter.

Embedded Systems for Power Electronics Lab

Introduction: Introduction to C: 'Hello World!' program, Fizz-buzz program, and Fizz-Buzz- Zazz program.

Micro controllers and DSP: Getting started with Code composer studio/ PSoC Creator.

Architecture and review of Digital Signal Controllers (TMS series controllers)/ microcontroller (PSoC), Architecture of controller, release and debug modes.

Blinking of an LED with one second ON, half second OFF, Programing requirements for time critical control applications

Control System Design

Basics of feedback control: History and motivation for feedback; terminologies, Frequency re- sponse, Stability concepts, Bandwidth, Transient response, Closed loop design specifications w.r.t tracking and disturbance rejection, Sensitivity to parameter variations.

Linear Control System Design Techniques: PD, PI and PID controllers, Lead and Lag com- pensators, Controller design with root locus technique, frequency response technique and state- space technique.

Grid Connected Converters

Review: Diode bridge rectifiers, thyristor based controlled rectifiers, cyclo-converters and ma- trix converters.

Single Phase Active Front-End Converters: Power balance, harmonic analysis, power factor correction, modeling of single phase FEC, cascaded control of 1-ph FEC, harmonic filters.

Three Phase Active Front-End Converters: Power balance and reactive power, power factor correction, modeling of three phase FEC, vector control of grid-connected converters, cascaded control of 3-ph FEC.

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