Thyristor

THYRISTOR RAM Muktesh Waghmare, Raman Gaikwad 1: Principle: Thyristor is well-known for its high-current drive capability and its bi-stable characteristics. It has been widely used in power electronics applications. With the exponential advances in CMOS technology tiny thyristor devices can now be easily embedded into conventional nano-scale CMOS. This enables the creation of a memory cell technology with features that include small cell size, high performance, reliable device operation, and

turning on and off of the power device occurs every time the mains crossing point is reached (half phase), 100 or 120 times per second. Typically light dimmers are manufactured using a Triac or Thyristor as the power control device. These electronic parts are semiconductors not dissimilar to transistors. A Thyristor is a Uni.-directional device and hence, because AC power flows in both directions, two are needed. A triac is a bidirectional device and therefore only one is needed. An electronic circuit

CHAPTER 1 INTRODUCTION 1.1 Introduction An increasing demand for high quality, reliable electrical power and increasing number of distorting loads may leads to an increased awareness of power quality both by customers and utilities. The most common power quality problems today are voltage sags, harmonic distortion and low power factor. Voltage sags is a short time (10 ms to 1 minute) event during which a reduction in r.m.s voltage magnitude occurs. It is often set only by two parameters, depth/magnitude

5.1 Review Li et.al[5] suggested Newton Raphson load flow method with wind power. Asynchronous and double fed induction generator were explained in detail and accordingly Jacobian matrices were suggested. An IEEE 5 bus system was used for case study which proved that the new NR method had a good convergence hence could be used for calculations for large grid with wind power. Steady state equivalent circuit for AG and DFIG were also discussed in the paper. Feijoo et.al [6] proposed two methods

Around the same time another inventor, George Westinghouse was trying to introduce his alternating current system to the world. Soon after, Tesla was contacted by Westinghouse to purchase all of his patents. Tesla then began working alongside by Westinghouse. However, they ultimately came out victorious with their AC system, Edison was able to bring his system to the market and made his inventions accessible to the world, which Tesla didn’t really do that. The power grid was featured by the use

cycloconverter is able to work in all drive quadrants (motor, generator and rotate in both directions) without any additional equipment. This type of frequency conversion uses thyristors to change the voltage and frequency straight from the supply frequency. Motor speed is varied by sending pulses to the gates of the thyristors. These machines can also be started, stopped, reversed and decelerated by regenerative braking. Cyclo-converters rectify positive and negative parts of cycle to create an AC

of three different Flexible Alternating Current Transmission System (FACTS) devices on a power system and to analyse their capabilities with respect to various disturbances. FACTS devices discussed in this paper are Static Var Compensator (SVC), Thyristor Controlled Series Capacitor (TCSC) and Unified Power Flow Controller (UPFC). The impact on power-flow and Power Oscillation Damping due to these devices is analysed in detail. Simulations based on different choices of Power Oscillation Damping (POD)

GUJARAT TECHNOLOGICAL UNIVERSITY (GTU) NOBLE GROUP OF INSTITUTIONS Affiliated with GTU A Project Report On “FACTs BY SVC” Prepared as a part of the requirements for the subject of PROJECT-I B.E., Semester – VII ( Electrical ) Submitted by: Sr. Name of student Enrollment No. 1. Savasani Rajkumar 13O350109526

main applications are for efficient bulk power transfer, point-to-point, over longer distances, using overhead lines A future generation of conservation and heritage engineers will have the task of ensuring preservation of HVDC equipment from the Thyristor Era and the related IGBT schemes. Much of this equipment is much larger, currently in service in HVDC schemes of a magnitude which would have been unimaginable to the early engineers working in the field. This represents a great future opportunity

A Power system is an connection of generators to load centres. Through H.V. electrical lines & in general is controlled mechanically. It can be divided into 3 subsystems: Generation, X’mission and Distribution-systems. The electric power demand is Growing and building of new generating units & transmission circuits is becoming difficult because of environmental & economic reasons. So, power utilities are forced to depend on utilization of existing generating units and to load existing lines close