Abstract:
Beginning with a brief historical perspective on the development of high voltage direct current (hvdc) transmission systems, this paper presents an overview of the status of HVDC systems in the world today. it then reviews the underlying technology of HVDC systems, and discusses the HVDC systems from a design, construction, operation and maintenance points of view. the paper then discusses the recent developments in HVDC technologies. the paper also presents an economic and financial comparison of HVDC s ....etc

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ABSTRACT
The Integrated Gate Commutated Thyristor (IGCT) combines the advantages of the hard driven GTO thyristor, including its dramatically improved turn- off performance, with technological breakthroughs at the device, gate-drive and application levels. Homogenous switching area of the IGCT up to the dynamic avalanche limits. Snubber circuits are no longer needed. Improved loss characteristics allow high frequency applications extending into the kHz range. A new ....etc

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ECE 8830 - Electric Drives
Introduction
Current-fed inverters requires a “stiff” constant current source input - thus are sometimes referred to as CSI (current source inverters or current stiff inverters).

A large inductance can be used to change a variable voltage input to a variable current input.

VSI-inverters and CSI-inverters are dual to each other.
Introduction (cont’d)
Power semiconductor devices used in CSI inverters must be able to withstand large reverse voltag ....etc

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The Integrated Gate Commutated Thyristor (IGCT) is a new high-power semiconductor device. IGCT is a special type of thyristor similar to a GTO. They can be turned on and off by a gate signal, have lower conduction loss as compared to GTOs, and withstand higher rates of voltage rise (dv/dt), such that no snubber is required for most applications.The structure of an IGCT is very similar to a GTO thyristor. In an IGCT, the gate turn off current is greater than the anode current. This results in a complete elimination of minority carrier injection ....etc

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HVDC Light
By,
NAGASHREE K


ABSTRACT

Transmitting power at high voltage and in DC form instead of AC is a new technology proven to be economic and simple in operation which is HVDC transmission. The HVDC (High Voltage Direct Current) technology is used to transmit electricity over long distances by overhead transmission lines or submarine cables. It is also used to interconnect separate power systems. A further development in this technology is HVDC light where HVDC light ....etc

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Abstract
This paper describes the conception and analysis of a unidirectional hybrid three-phase rectifier suitable for mediumand high-power applications. The rectifier is composed of a single-switch diode bridge boost-type rectifier in parallel with a pulsewidth modulation (PWM) three-phase unidirectional boost rectifier. The objective is to obtain a structure capable of providing sinusoidal input currents with low harmonic distortion and dc output voltage regulation. The diode rectifier operates at low frequency and has a higher outp ....etc

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1. GSM BASED ELECTRICAL BILLING AND CUT-OFF SYSTEM

2. SMS BASED FIELD AUTOMATION

3. AUTOMISED JACQUARD POWER LOOM

4. ECONOMICAL ALCOHOL BREATH ANALYSER

5. BLIND ASSISTING DEVICE

6. WIRELESS TILT JOYSTICK

7. ULTRASONIC ANTI-CRASHING SYSTEM

8. WIRELESS WEATHER STATION MONITORING SYSTEM USING GSM

9. ROBOTIC ARMY SURVEILLANCE ....etc

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An IGCT is a special type of thyristor similar to a GTO. They can be turned on and off by a gate signal, have lower conduction loss as compared to GTOs, and withstand higher rates of voltage rise (dv/dt), such that no snubber is required for most applications.

The structure of an IGCT is very similar to a GTO thyristor. In an IGCT, the gate turn off current is greater than the anode current. This results in a complete elimination of minority carrier injection from the lower PN junction and faster turn off times. The main difference is a red ....etc

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High-voltage direct current



A high-voltage, direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power, in contrast with the more common alternating current systems. For long-distance transmission, HVDC systems may be less expensive and suffer lower electrical losses. For underwater power cables, HVDC avoids the heavy currents required by the cable capacitance. For shorter distances, the higher cost of DC conversion equipment compared to an AC system m ....etc

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1. ABSTRACT:
In modern power systems network, it is essential to transmit power from one region to another region in order to meet the load demands. This can only possible by having Asynchronous power transmission between two regions operating at different frequency. This Asynchronous power transmission is called HVDC transmission.
Beginning with a brief historical perspective on the development of High Voltage Direct Current (HVDC) transmission systems, this paper presents an overview of the ....etc

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1. GSM BASED SMART SENSOR FOR INDUSTRIAL AUTOMATIC FAULT DIAGNOSER WITH VOICE FACILITY

2. ADAPTIVE AUTOMOBILE HEADLIGHTS

3. WIRELESS MICROCONTROLLER BASED BLACK BOX FOR CAR

4. CELLPHONE OPERATED LAND ROVER

5. ELECTRONIC EMBEDDED DATA VERIFICATION AND CONTROL SYSTEM FOR AUTOMOBILES

6. ARTIFICIAL INTELLIGENCE

7. GSM BASED CENTRALIZED ELECTRICITY BILLING SYSTEM

8. MICROCONTROLLER BASED SPY ROBOTIC VEHICLE USING MOBILE TECHNOLOGY (SPYBOT)

9. SMART AMBULANCE

10. GSM NETWORK CONTROLLED ROBOT WITH VIDEO AND AUDIO COMMUNICATI ....etc

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ABSTRACT
The Integrated Gate Commutated Thyristor (IGCT) combines the advantages of the hard driven GTO thyristor, including its dramatically improved turn- off performance, with technological breakthroughs at the device, gate-drive and application levels. Homogenous switching area of the IGCT up to the dynamic avalanche limits. Snubber circuits are no longer needed. Improved loss characteristics allow high frequency applications extending into the kHz range. A new ....etc

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I need integrated gate-commutated thyristor ppt. ....etc

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