TNSCST-Student Project Scheme 1

Fuzzy Optimized starting of IGBT based Ac Voltage
Controller Fed Induction Motor
A project Proposal submitted to

Tamil Nadu State Council for Science & Technology
Directorate of Technical Education (DOTE) Campus,
Chennai-600025
Under
Student Project Scheme
Submitted by:
EEE FINAL YEAR UG SCHOLARS
R.SUBHASHREE
C.KEERTHANA
S.POORNA
Department of Electrical and electronics engineering
Agni College of Technology
OMR, Near Navalur, Thalambur, Chennai, India- 603103
www.act.edu.in
STUDENT PROJECT PROPOSAL
1. Name of the Student (s) : R.Subhashree

One e-mail id C.Keerthana
S.Poorna
Keerthana.eee@act.edu.in
2. Name of the Guide : S.Menaka.M.E.,

Designation Assistant Professor
Institutional Address EEE Department
Phone No. & Mobile number Agni College of Technology,
OMR, Thalambur, Chennai-603 103
7598685871
3. Project Title : Fuzzy Optimized starting of IGBT based

Ac Voltage Controller Fed Induction
Motor
4. Sector in which your Project : Engineering & Technology

proposal is to be Considered
5. Project Details : Enclosed
6. Has a similar project been : NO

carried out in your
college/elsewhere. If so, furnish
details of the previous project
and highlight the improve-ments
suggested in the present one
CERTIFICATE
This is to certify that Mr./Miss........................................................................... is a

bonafide final year student of P.G. Science / U.G. Engineering / P.G. professional
courses of our college and it is also certified that two copies of utilization certificate
and final report along with seminar paper will be sent to the Council after completion
of the project by the end of April 2014.
Signature of the Guide Signature of the HOD Signature of the Principal /

Head of the Institution
1. Introduction:
Variable speed drives are growing and varying. Drives expanse depend on
progress in different part of science like power system, microelectronic, control
methods, and so on. Artificial intelligent contains hard computation and soft
computation. Artificial intelligent has found high application in most nonlinear
systems same as motors drive. Because artificial intelligent techniques can use as
controller for any system without requirement to system mathematical model, it has
been used in electrical drive control. With this manner, efficiency and reliability of
drives increase and volume, weight and cost of them decrease. Due to the improved
operating characteristics they give to the equipment control, electronic motor soft
starters are increasingly widely applied. Escalators, pumps, elevators and conveyor
belts all operate more effectively if they are soft started. However, it is not simply the
ergonomics of an airport, process plant or shopping mall that are improved by soft
starters. A major factor in the growth in popularity of soft starters is the reduced wear
and tear that they place on motors and their associated drive systems. In turn, this
reduces maintenance, conserves energy and plays a significant part in improving plant
performance and operating costs.
In three phase Induction motor, conventional starting method induces

problems like voltage dip, large inrush currents and high positive and negative torque
pulsations in the first half cycle and leads to reduced life and reliability of mechanical
parts which requires frequent maintenance and inspection. IGBT based Ac voltage
controller with fuzzy optimization technique is the viable solution to the starting
problems of induction motors. The basic control action involved in this scheme is to
control the magnitude of applied voltage at a fixed frequency to achieve the
objectives. Attempts have been made in the past to improve the performance of ac
voltage controller-fed induction motors. The most important parameter to be
controlled in this up gradation process is obtaining the optimum firing angle. Fuzzy
system gives high acceleration time and non sinusoidal terminal voltages and currents
of the motor at steady state. IGBT is a fully controllable switch and have much faster
switching capability because of their unipolar conduction. Thus Fuzzy with IGBT
based Ac voltage controller provide better results. The proposed circuit will be
primarily verified using matlab simulink and then implemented as hardware for the
future utilization in industries.
The drives are categorized according to switching nature (natural or force

commutated), converter type and motor type. Naturally commutated devices require
external voltage across the power terminals (anode-cathode) to accomplish turn-off of
the switch whereas a force commutated device uses a low power gate or base voltage
signal which initiates a turn-off mechanism in the switch itself. In this figure the
category of transistor based drives is intended to also include other hard switched
turn-off devices such as GTOs, MCTs and IGCTs which are, in reality, avalanche
turn-on (four-layer) devices.
Figure1. A transistor based induction motor drive
Significance of Soft Starting:

In today’s market motors are used across a wide section of the commercial
sector. It could be from standard squirrel cage motors in a typical boiler room
situation or alternatively it could be a variable speed motor requiring the use of an
inverter to ramp the run cycle up and down. Similarly soft starts are becoming more
apparent throughout the industry. The current drawn by a three-phase motor at start up
is several times more than its rated operating current. This can vary from 3 to 15 times
depending on the characteristics of the motor and is typically at least a factor of 7
more than the operating current. In addition, problems associated with torque surge
are encountered when a motor is started direct. Extra stress on the gearbox, couplings,
belt drives and other parts can soon lead to wear and even failure. To overcome the
problems associated with current and torque surges, designers have developed
different systems over the years. These can be categorized as follows: Direct-online
starting; Star delta starting; Frequency conversion; and Solid state, step less control,
or soft starting.
Soft start systems however, offer an excellent alternative at low cost and
complexity. Soft start devices provide stepless motor control, allowing both the start-
up torque and current to be adjusted in small increments. Not only can these
parameters be controlled; soft starters can also vary the time taken to run the motor up
to its normal operating speed. The devices operate by gradually increasing the voltage
to the motor during the run-up period, this being done by phase control of the input
AC voltage. The starting current is reduced in proportion to the reduction in voltage,
the starting torque by the square of the reduction. Soft starting is now finding
application in control situations as diverse as water treatment plants and crisp
factories. The benefits of longer motor life, reduced maintenance and improved torque
control mean that this type of starter is now being used in many areas where inverters
would have previously been considered the only option.
2. Objectives:
In this proposal a soft computing technique is used to recognize the optimum
firing angle through trial basis for improving the performance of ac voltage controller-
fed induction motors. It gives high acceleration time and non sinusoidal terminal
voltages and currents of the motor at steady state. The thyristors used in the
conventional controller is replaced by IGBT for the following reasons (1) Major
problem associated with SCRs is that they are not fully controllable switches. (2) Also
in high-frequency applications, thyristors provide lower performance due to large
switching times arising from bipolar conduction whereas IGBTs, have much faster
switching capability because of their unipolar conduction.
The main objectives are:

i. To increase the starting performance of the induction motor through
fuzzy optimal solution.
ii. To reduce heavy starting currents and voltage dip.
iii. To minimize the high positive and negative torque pulsation in the first
half cycle.
iv. Thus preventing the motor from overheating and providing overload
and no-voltage protection.
Project significance/relevance:
 The huge part of power generated is consumed by inductive loads like

induction machines and other inductive equipments can be optimized
comparatively by improving the starting performance
 If we improve the starting performance of an induction machine it will
lead to a significant amount of energy to be saved.
3. Methodology:
a. To collect and study the required materials relevant to the project work.
b. To analyze the drawbacks of the conventional methods and try to eliminate
them with a new technique.
c. To design and develop the model of a Fuzzy Optimized starting of IGBT
based Ac Voltage Controller Fed Induction Motor.
4. Work Plan:
The stages of plan have been given below:
Stage: 1 An IGBT based ac voltage controller fed induction motor has to be simulated
using matlab
Stage: 2 Prototype of the simulated model has to be implemented and checked for any
rectification
Stage: 3 Finally the desired output has to be derived for better performance
5. Budget
SL.N COST IN
EQUIPMENTS QUANTITY
O RUPEES
POWER IGBTs, POWER AS PER THE

1.0 3000/-
DIODES AND PCBs REQUIREMENT OF THE
CIRCIUT DESIGNED
2.0 1 NO 3500/-
PIC CONTROLLER BOARD
OTHER MISCELLANEOUS
EQUIPMENTS FOR CARRYIG AS PER THE
3.0 3000/-
OUT THE HARDWARE REQUIREMENT
DESIGN AND
IMPLEMENTATION
TOTAL 9500/-

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Fuzzy Optimized starting of IGBT based Ac Voltage

Controller Fed Induction Motor

A project Proposal submitted to

Department of Electrical and electronics engineering

Agni College of Technology

OMR, Near Navalur, Thalambur, Chennai, India- 603103

1. Name of the Student (s) : R.Subhashree

2. Name of the Guide : S.Menaka.M.E.,

3. Project Title : Fuzzy Optimized starting of IGBT based

4. Sector in which your Project : Engineering & Technology

5. Project Details : Enclosed

6. Has a similar project been : NO

This is to certify that Mr./Miss........................................................................... is a

Signature of the Guide Signature of the HOD Signature of the Principal /

In three phase Induction motor, conventional starting method induces

The drives are categorized according to switching nature (natural or force

Figure1. A transistor based induction motor drive

Significance of Soft Starting:

The main objectives are:

 The huge part of power generated is consumed by inductive loads like

The stages of plan have been given below:

POWER IGBTs, POWER AS PER THE

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