LAXMI INSTITUTE OF TECHNOLOGY · Electrical Engineering to the ambitious graduates to be proficient in their career. Departmental Mission To provide education of high global standards

LAXMI INSTITUTE OF TECHNOLOGY SARIGAM

COURSE FILE

Faculty Name : Dr. R. ANJANA

Subject Name : CONTROLS OF ELECTRICAL DRIVES

Subject Code : 2160913

Course Name : B.E (Electrical Engineering)

Semester : VI

Session : Dec - April 2019

DEPARTMENT OF ELECTRICAL ENGINEERING

Institutional Vision To educate the unreached talents to beacon the nation through research and innovative technology

Institutional Mission Ɣ To impart seamless education to individual scholars for delivering the highest

quality professionalism and cutting edge research for the benefit of society on a national and global scale.

Ɣ To foster and maintain mutually beneficial partnerships with our alumni, friends, industry, and local, state, and central governments through public services assistance and collaborative research.

Ɣ To be the centre of excellence for creating holistic citizens inculcated with ethical, moral and social values in diverse culture of Indian environment.

Departmental Vision

To become a trailblazer in providing education and training in the field of Electrical Engineering to the ambitious graduates to be proficient in their career.

Departmental Mission

To provide education of high global standards with the able guidance of dedicated professionals and a state of art ambience.

To motivate the electrical engineers to focus on the eco-friendly renewable sources of energy.

To impart quality education for enhancing opportunities

DEPARTMENT OF ELECTRICAL ENGINEERING

CLASS TIME-TABLE

SEM: 4thEC-(C-244) TERM: Dec - April 2019 W.E.F: 17/12/2018

DAYt TIMEs 08:20

to 09:10

09:10 to

10:00

10:10 to

11:00

11:00 to

11:50

12:00 to

12:50

12:50 to

01:35

Monday SUBJECT FACULTY

EPS-2(SS) HVE(PRP) DDMT(SK)1(C 245)

HVE(PRP)2(SGP LAB) CED(RA)3( IT LAB 1)

UEET(PNP)

DDMT(SK)

Tuesday SUBJECT FACULTY

EPS-2(SS) PE-2(VP) PE2(VP)2(C 248)

HVE(PRP)1(SGP LAB) DDMT(SK)3(C 245)

EPS-2(SS) CED(RA)

Wednesday SUBJECT FACULTY

UEET(PNP) DDMT(SK) PE-2(VP) CED(RA) PE2(VP)1(C 248)

EPS2(SS)3(IT LAB 2) CED(RA)2(C 249)

Thursday SUBJECT FACULTY

UEET(PNP) DDMT(SK) CED(RA) HVE(PRP) PE2(VP)3(C 248)

EPS2(SS)2(IT LAB 2) CED(RA)1(C 249)

Friday SUBJECT FACULTY

HVE(PRP)3(SGP LAB) EPS2(SS)1(IT LAB 2) DDMT(SK)2(C 245)

PE-2(VP) HVE(PRP) DDMT(SK) EPS-2(SS)

Saturday SUBJECT FACULTY

CED(RA) HVE(PRP) PE-2(VP) UEET(PNP) DESIGN ENGG. (BPD)

PERSONAL TIME-TABLE

DAYt TIMEs 08:20

to 09:10

09:10 to

10:00

10:10 to

11:00

11:00 to

11:50

12:00 to

12:50

12:50 to

01:35

Monday SUBJECT FACULTY

CED – 3

C 249

Tuesday SUBJECT FACULTY

CED C 244

Wednesday SUBJECT FACULTY

CED C 244

CED – 2 C 249

Thursday SUBJECT FACULTY

CED C 244

CED – 1

C 249

Friday SUBJECT FACULTY

Saturday SUBJECT FACULTY

CED C 244

Laxmi Institute of Technology , Sarigam Approved by AICTE, New Delhi; Affiliated to Gujarat Technological University, Ahmadabad Academic Year : 2018-2019

SCHEME

SYLLABUS

Unit Topics Teaching Hours

Module Weightage

I Introduction: • History Of DC Drive -Electronic Control -Solid State Control • State Of Art Of DC Drive • Block Diagram Of Drive - Components Of Electrical Drive and their functions

2 6

2 Dynamics of Electrical Drives

Types of Load-Quadratal diagram of speed –torque characteristics – Types and Characteristics of load torque – Dynamics of motor- load combination – steady state & transient stability of an electrical drive – Determination of moment of inertia- Load equalization

6 15

3 DC drives Speed-torque characteristics:

DC separately excited, shunt and series motors; Modified speed-torque characteristics with resistive control; Analysis for speed-torque equations in terms of firing angle and duty cycle; Modified speed-torque characteristics with phase controlled converters and DC-DC converters for continuous conduction and discontinuous conduction; Closed loop speed control schemes; Dynamic model of DC machine; Speed and position control scheme using the dynamic model

10 24

4 Scalar control of AC machines

Review of V/f control; VSI based Induction Motor control; Harmonics and Harmonic torques with VSI; Selection of carrier frequency and harmonic spectrum; Advantages of V/f control over other scalar control techniques; Various operating modes for doubly fed induction machine: Sub-synchronous and super-synchronous motoring and generating; Static Scherbius drive: Design aspects like speed range, power factor, ratings of components; Closed-loop speed control schemes: slip control, current limit control; CSI fed IM; Speed-torque characteristics with current source; Comparison with VSI based control

10 24

5 Dynamic modeling and Vector control 10 21

Semester Course Title Course Code Theory Paper L T P

VI Control of Electrical

Drives 2160913 3 0 2 70

Dynamic model of induction motor: ABC reference frame, Arbitrary reference frame, stationary reference frame, rotating reference frame; Principle of Vector control, Field oriented control: Stator Flux Control and Rotor Flux Control; Direct torque control; Comparison of FOC and DTC, Introduction to Synchronous motor and BLDC machine drive

Applications of Electric Drives

Introduction to Solar and battery powered Drives; Introduction to traction Drives; Servo motor drive requirement – control and implementation

04 10

List of Reference Books S.No Book Title Author Publication

1 Modern Power Electronics and AC Drives

Bimal K. Bose Pearson Education

2 Electric Drives

Vedam Subrahmanyam

TMH (I), Second Edition

3 Fundamentals of Electrical Drives

G.K. Dubey Narosa Publishing House, New

Delhi, 2nd ed. 2001

4 Power Semiconductor Controlled Drives

G. K. Dubey Prentice Hall International

Edition. 1989. 5 Power Electronics Control of AC Motors

J.M.D. Murphy and F.G. Turnbull

Peragmo

6 Electric Motor Drives–Modeling, Analysis and Control

R.Krishnan PHI

7 Control of Electrical Drives Werner Leonhard

Springer, 2001

8 Electrical Machines, Drives and Power Systems Theodore Wildi

sixth edition, Pearson

LAXMI INSTITUTE OF TECHNOLOGY,SARIGAM

Department of Electrical Engineering Academic Year : 2018 -2019

ASSIGNMENT – I

Name of the Subject: CED Date: 17.01.2018 Subject Code : 2160913 S. No Question Remarks

1. Explain drive parameter i. Loads with rotational motion ii. Loads with translational motion

2. Explain the Dynamic model of DC motor drive

3. Explain the four quadrant diagram of speed torque characteristic using hoist load.

4. Explain the nature and classification of load torques.

5. A 200V dc series motor runs at 800rpm when operating at its full load current of 10A. the motor resistance is 0.5Ω and magnetic circuit can be assumed unsaturated, what will be the speed if (a) the load torque is increase by 50% (b) the motor current is 5A.

Date of Submission: 17.01.2018 Name & Sign of Subject In-charge: R. ANJANA

Laxmi Institute of Technology , Sarigam

Approved by AICTE, New Delhi; Affiliated to Gujarat Technological University, Ahmedabad

Academic Year 2018-19 Centre Code: 086 Examination :MID-1

Branch: Electrical Semester: IV Sub Code: 2160913

Sub: CED Date: 29.1.2019 Time:9 am – 10am Marks: 20

Q1. Is compulsory. Attempt three from the remainng.

Q.1 Write in Detail about Load Equilization. 05

Q.2

Explain drive parameter

a. Loads with rotational motion.

b. Loads with translational motion.

05

Q. 3 Draw the basic block diagram of electric drives and explain function of each block 05

Q. 4 Explain the four quadrant diagram of speed torque characteristic using hoist load. 05

Q. 5 Explain steady-state and transient stability of an electric drive. Derive the expression. 05

Q. 6 A motor is coupled to a load having the following characteristics. T= 15 - 0.5 のm; TL = 0.5 のm.

Find out the stable operating point for this combination.

05

Laxmi Institute of Technology , Sarigam Approved by AICTE, New Delhi; Affiliated to Gujarat Technological University, Ahmadabad

QUESTION BANK

Chapter/Unit: 1 Sr. No. Name of Question Remarks

1 Draw the basic block diagram of electric drives and explain function of each block.

2 Compare AC and DC Drives

3 What is electric drive? Advantages of electrical drive.

Chapter/Unit: 2 Sr. No. Name of Question Remarks

1 Explain drive parameter i. Loads with rotational motion ii. Loads with translational motion

2. Explain the nature and classification of load torques

3 Explain the Dynamic model of DC motor drive

4 Explain the four quadrant diagram of speed torque characteristic using hoist load.

5 Explain in detail about steady state & transient stability of an electrical drive

6 Determination of moment of inertia

7 Give the speed torque characteristics of DC motor

Chapter/Unit: 3 Sr. No.

Name of Question Remarks

1 Explain speed torque characteristics of DC series motor, DC shunt motor ,and PMDC motor.

3 Explain type-A and type-B chopper.

4 Explain the torque equation for D.C motor.

5 Explain the Dynamic model of DC motor drive.

6 Explain speed torque conventions and multi quadrant operation of drives.

7 Explain four quadrant chopper (Type-E chopper).

9 Explain single phase semiconductor & half controlled converter.

10 What are the operating modes of three phase full converter with inductive load and explain any one.

11 Explain how to obtained a variable average output voltage from a fixed dc voltage with the help of chopper.

12

A 200V dc series motor runs at 800rpm when operating at its full load current of 10A. the motor resistance is 0.5っ and magnetic circuit can be assumed unsaturated, what will be the speed if (a) the load torque is increase by 50% (b) the motor current is 5A.

13 Explain the different types of speed control methods for dc shunt motor

14

A 200V dc series motor has armature and field resistance of 0.2っ and 0.1っ respectively. It takes a current of 20A from the supply while running at 1300rpm. If an external resistance of 2っ is added in series with the motor calculate new armature current and the speed. Assume load torque is remains constant.

Chapter/Unit: 4 Sr. No. Name of Question Remarks

1 Explain the analysis of the PWM half bridge inverter.

2 Different between VSI & CSI induction motor drives.

3 Explain the constant flux speed control using voltage source inverter

4 State the advantages and applications of synchronous motor drives.

5 Draw the basic block diagram of commutator less dc shunt motor and explain function of each block.

6 Briefly describe about VSI based Induction Motor control

7 Briefly describe about Various operating modes for doubly fed induction machine

8 Briefly describe about Static Scherbius drive

9 Give any one Closed-loop speed control schemes

10 Give Speed-torque characteristics with current source Inverter

Chapter/Unit: 5 Sr. No. Name of Question Remarks

1 Explain d-q model of induction motor.

2 Explain the principle of vector control model for ac induction motor drives

3 Explain ABC reference frame

4 Explain Arbitrary reference frame

5 Explain stationary reference frame

6 Explain rotating reference frame

7 Briefly describe Stator Flux Control and Rotor Flux Control

8 Compare of FOC and DTC

9 Briefly describe Synchronous motor drive

10 Briefly describe BLDC motor drive

Chapter/Unit: 6 Sr. No. Name of Question Remarks

1 Explain advantages & disadvantages of traction drives

2 Explain basic structure of solar and battery powered drives.

3. Explain the servo motor drive requirement, control and implementation.

1

Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–VI (NEW) EXAMINATION – WINTER 2017 Subject Code: 2160910 Date: 20/11/2017 Subject Name:Electrical Drives Time:02:30 PM TO 05:00PM Total Marks: 70 Instructions:

1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks.

MARKS Q.1 (a) List advantages of Electric Drives. 03

(b) Explain factors affecting the selection of drive. 04 (c) Derive the equivalent value of drive parameters for loads with

rotating motion and translational motion. 07

Q.2 (a) What is the meaning of stability of a drive? State the condition for

steady state stability. 03

(b) What is load equalization? Why is it required? 04 (c) List components of load torques. Draw and explain torque speed

characteristic of fan, high speed hoist, traction load and constant power loads.

07

OR (c) Explain the single phase full-wave converter with RLE load and

explain the operation for the firing angle beyond 90o. 07

Q.3 (a) List advantages of PWM inverters 03 (b) Explain class B chopper with necessary diagram. 04 (c) Explain selective harmonic elimination technique for inverter. 07 OR

Q.3 (a) Give comments on relation between carrier frequency and harmonic frequency for PWM inverters.

03

(b) Explain principle of dual converter with necessary diagram. 04 (c) Explain three phase inverter with 180o conduction mode using

necessary circuit and waveforms. 07

Q.4 (a) What is self-tuning control? 03 (b) Why speed torque characteristic of PMDC motor is superior to

conventional DC motor? 04

(c) Explain model referencing adaptive control. 07 OR

Q.4 (a) Draw torque speed characteristic of different DC motors. 03 (b) Draw and explain block diagram of close loop position control of

DC motor. 04

(c) Derive d-q model of Induction Motor in rotating reference frame. 07

Q.5 (a) What is the use of dynamic modelling of Induction motor? 03 (b) Explain principle of vector control. 04 (c) Write a short note on BLDC motor drives. 07 OR

Q.5 (a) List the applications of servo motor drives. 03 (b) Explain requirements of traction drive. 04 (c) Write a short note on solar power drives. 07

*************

1

Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–VI (NEW) - EXAMINATION – SUMMER 2017

Subject Code: 2160910 Date: 08/05/2017 Subject Name: Electrical Drives Time: 10:30 AM to 01:00 PM Total Marks: 70 Instructions:

1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks.

MARKS Q.1 Short Questions 14

1 State two methods to get variable dc from fixed ac source.

2 Write generalized equation for calculating equivalent moment of inertia for load having only rotational load.

3 Show all friction components on single graph.

4 Draw speed-torque curves of different types of DC motors in a single graph.

5 Define plugging. 6 Give full name of MRAC in regards with electric drive.

7 State limitations of V/f control I.M. drive.

8 What is the importance of critical speed for dc separately excited motor drive operated with single phase fully controlled rectifier?

9 What do you understand by constant flux operation in ac drives.

10 Give disadvantages of group drive system.

11 What is a dual converter? When is it used?

12 Stator voltage control in induction motor is suited for fan load. Why? 13 What is maximum power point tracker in regards with solar drives?

14 Which dc voltage levels are used in traction drives in India?

Q.2 (a) Draw block diagram of electric drive and give function of each block. 03 (b) Derive the condition for steady state stability of the drive. 04 (c) Explain the Multi quadrant operation of electrical drives with suitable

conventions and example. 07

OR (c) Motor drives the winch drum through a reduction gear with a gear tooth ratio

of 0.1.The friction torque at winch shaft is 15 N-m and at motor shaft 10 N-m. Motor speed is 1500 rpm. Calculate the equivalent moment of inertia of the drive referred to the motor shaft and motor torque if gears have an efficiency of 90%. All inertia shown in diagram is in kg-m2. Radius of the winch is 0.2 m.

07

2

Q.3 (a) Give advantages of PWM inverters. 03 (b) Write a short note on sinusoidal PWM method. 04 (c) Explain regenerative braking control in chopper based DC drive. 07 OR

Q.3 (a) Explain the Type A chopper circuit. 03 (b) Explain the Type B chopper circuit. 04 (c) Explain single phase full wave bridge type controlled converter with RLE load

and with freewheeling diode. Also draw all the necessary waveforms and derive equations of output DC voltage and current.

07

Q.4 (a) Explain dynamic model of DC machine. 03 (b) Why speed torque characteristic of PMDC motor is superior to conventional

DC motor? 04

(c) Explain position control method for DC motor. 07 OR

Q.4 (a) What is Sliding mode control? State its advantages. 03 (b) Explain principle of Vector control of induction motor. 04 (c) Explain d-q model of induction motor in detail. Also state its application in the

field of drive. 07

Q.5 (a) Draw block diagram of solar and battery operated drive. 03 (b) Explain requirement of servo motor drive. 04 (c) What is load equalization in regards with electric drives? Why it is required?

Derive equation to find moment of inertia of flywheel with necessary assumptions.

07

OR Q.5 (a) What is self tuning control? 03

(b) List and explain qualities required for a traction drive. 04 (c) Explain CSI operated drive. State its advantages and area of application. 07

*************

1

Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–VI (NEW) - EXAMINATION – SUMMER 2018

Subject Code:2160910 Date:08/05/2018 Subject Name:Electrical Drives Time:10:30 AM to 01:00 PM Total Marks: 70 Instructions:

1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks.

Q.1 (a) Derive fundamental torque equation. 03 (b) Write advantages and disadvantage of electric drives 04 (c) Explain selection factors of electric drives. 07

Q.2 (a) A motor is coupled to a load having the following characteristics. T= 15 - 0.5 のm

TL = 0.5 のm2

Find out the stable operating point for this combination.

03

(b) Explain characteristics of different types of load. 04 (c) Explain four quadrant operation of Electric drive using

example of a cage. 07

OR (c) Explain steady state and transient stability of an electrical

drive. 07

Q.3 (a) Draw and explain type-C chopper drive. 03 (b) Explain single phase dual converter. 04 (c) Explain model referencing adaptive control 07 OR

Q.3 (a) Draw and explain type-D chopper drive. 03 (b) Explain closed loop Current limit control of DC machine. 04 (c) Explain self tuning control. 07

Q.4 (a) Explain need of poly phase rectifier. 03 (b) Explain Shunted armature speed control of DC series

motor. 04

(c) Explain single phase full bridge inverter with RL load 07 OR

Q.4 (a) Explain advantages of poly phase rectifier. 03 (b) Explain Flux control method for speed control of DC

shunt motor. 04

(c) Explain d-q model of induction motor with required derivations.

07

Q.5 (a) Write relative merits and demerits of VSI and CSI. 03 (b) Write a short on solar and battery powered drives. 04 (c) Explain vector control of PMSM 07 OR

Q.5 (a) Draw vector control model of Induction motor. 03 (b) Write a short note on servo motor drive requirement,

control and implementation. 04

(c) Explain BLDC machine drive. 07 *************