Hardware Implementation of single phase step down cycloconverter

Project Title

Hardware Implementation of single phase step down cycloconverter

Project Area of Specialization Electrical/Electronic EngineeringProject Summary

Starting of an induction motor draws a high current (approx. 7 times of normal current) due to low back EMF. High starting current causes voltage dip which affects the performance of an induction motor. Starting current can be controlled through different methods i-e star-delta conversion, voltage drop, or lowering input frequency. Here we use a cycloconverter to control the speed of motors because there is no harmonic in output and its efficiency is very good    Cycloconverter converts ac power of fixed frequency to ac power of variable frequency. the need of Cycloconverter is to control the speed of large motor like Water pumps, rolling mills, cement mill, etc., therefore, the output frequency of cycloconverter is reduced which help us to start large load with full load at minimum speed and then slowly increase the speed of the motor by increasing the output frequency.

As the speed of motors depends on the frequency and number of a pole (Ns=120f/p) so frequency can easily change than changing the pole. There are different methods to control the speed of induction motors. We use thyristors as a switching device there are two switching circuits positive and negative which are used for positive half cycle and negative half cycle and these all-logical operations are controlled through a code written in PIC18F4550 microcontroller. This contro0ller sends a pulse through an optocoupler to trigger the thyristor.

Project Objectives

1. Design of single phase step down cycloconverter for the speed control of induction motor.
2. Hardware implementation of power supply.
3. Hardware implementation of single phase step down cycloconverter.

Project Implementation Method

The implementation of the project involves the following steps to achieve our objectives:

1. Gain knowledge about the basics and working of cycloconveter.
2. Understanding the background theory and acquire knowledge about the previously done work in similar area.
3. Design of power supply (5V) and cycloconverter by using the software. 
4. Design single phase step down cycloconverter using PIC18F4550.
5. Hardware implementation of power supply .
6. Hardware implementation of sinlge phase step down cycloconverter.
7. Compare simulated with measured result.
8. Accumulate all details and compose a project report.

Benefits of the Project

Induction motors are the essiential part of the Industry . Starting of the induction motor has always been the problem .Speed control of induction motor with variable frequencies i.e. f, f/2 and f/3 is one of the possible solution. We can operate large induction motors with full load at minimum speed.

Technical Details of Final Deliverable

The final delieverables will be 

The controlled speed of the Induction motor at variable frequency with the help of the cycloconverter.

Final Deliverable of the Project HW/SW integrated systemCore Industry Energy Other Industries Education Core Technology OthersOther TechnologiesSustainable Development Goals Industry, Innovation and InfrastructureRequired Resources

Item Name	Type	No. of Units	Per Unit Cost (in Rs)	Total (in Rs)
			Total in (Rs)	52750
Stationary , poster , thesis printing	Miscellaneous	1	5500	5500
Overhead , visits fare	Miscellaneous	1	4500	4500
pic 18f4550	Equipment	2	1850	3700
transformer	Equipment	2	350	700
pic18f4550 base	Equipment	2	100	200
physical button , led lights	Equipment	10	50	500
rectifier	Equipment	3	100	300
voltage regulator	Equipment	3	150	450
capacitor,resistor	Equipment	30	50	1500
induction motor	Equipment	2	14500	29000
pcb	Equipment	2	1200	2400
optcoupler	Equipment	10	50	500
SCR	Equipment	20	50	1000
connecting wire	Equipment	1	250	250
bread board	Equipment	5	150	750
glue gun , soldering wire	Equipment	2	750	1500