Bengal College Of Engineering &

Technology

Prepared By: Saurav Kumar Singh

Santanu Dhara Kaustav Halder

Jyoti Kumari

Mentor:Mr.Saradindu MondalAsst. Professor,

Dept. of EEE, BCET

Final Year Project Presentation

Dept. of Electrical & Electronics Engg.

TopicSpeed Control of Three Phase Induction Motor

using‘variable frequency

drive’ (VFD)And

Its Applications

PROJECT OVERVIEW

Variable Frequency

Drive

ProgrammableLogic

Control(PLC)

SCADA

What’s VFD.. an Overview !! A system for controlling the speed an Alternating Current (AC) electric motor.

By controlling the frequency of the electric power supplied to the electric motor.

It provides the starting torque control, gradually ramps the motor up to the operating speed to lessen mechanical and electrical stresses, thereby reducing maintenance and repair costs resulting in the increase of instrument life.

Wiring Diagram of VFD

Different Parts of VFD

Rectifier

Soft Charge Circuit

Intermediate Circuit (DC link)

Brake Circuit

Inverter

Pulse Width Modulator

Control And Regulation Section

Rectifier Section

This section is used to change the incoming power from AC to DC.

Soft Charge Circuit

A Part of Rectifier Section. Used to power up the Variable Frequency Drive.

Intermediate Circuit

Acts as a power storage facility for the next section, the INVERTER

section.

Inverter Section

Takes the voltage from the DC bus and using PWM sends a signal which

appears to motor as AC.

Brake Circuit

Used as Dynamic Braking with devices that need to stop or change direction

quickly.

Pulse Width Modulator

The waveform that goes to the motor shows the switching frequency of IGBTs. This switching pattern is known as Pulse Width Modulation.

Control & Regulation

Coordinates and regulates signals

inside the drive.

Monitors AC motor Current.

Input & Display Panel

Input Parameters

High Speed

Low Speed

Forward Motion

Reverse Motion Accelerating Time

Deceleration Time

Block Diagram of Model

Contactor 1 VFD Contactor 2

Motor

Star-DeltaStarter

PLC controlled VFD A device invented to replace the necessary sequential relay circuits for the machine control.

The user enters the program, usually via a software, that gives the desired results.

Saves money and time, so almost any application that needs some type of electrical control has a need of PLC.

PLC operation

PLC capabilities

SCADA overview Enables user to collect data and send

control information to the central server.

Employs both data acquisition and telemetry.

consists of collecting Information, transferring it to the central site, carrying out necessary control & analysis, and then displaying the data on a number of operator screens.

Industrial Application

Experimental Setup

End of presentation

# SMEClabs, Kerala # Dept. of EEE, BCET, Durgapur