Security System Based On Stepper Motor Control Using Micro Controller

Paper Presentation on  Security System Based On Stepper Motor Control Using Micro Controller ( Paper Presentation )
Abstract: There are different types of security models in the present day world. A prototype of security model is considered in which stepper motor is controlled using micro controller. Stepper motor is only considered because of its advantages such as precise positioning and accurate placement. These can be controlled by using microprocessors but micro controllers have several advantages over  microprocessors due to which it is considered for controlling of  motor. Though there are different types of  stepper motors selection of  motor is based  on the application. Micro controllers produce very minute currents which are not sufficient to drive the stepper sufficient to drive the stepper motor, so a driver circuit is used namely ULN 2003 to amplify the current . ULN 2003 consists of 7 pairs of Darlington pair transistors which are used to amplify the current. Sensors used for protection consists of transmitter and receiver and if any thing is obstructed between them signal will be given to the controller and stepper motor rotates to that side, by connecting a camera to the stepper motor the image can be monitored. This can be further extended and can be used in robotics which is the future of the world.

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Hvdc Transmission Using Voltage Source Converters (Vsc)

Paper Presentation on Hvdc Transmission Using Voltage Source Converters  (Vsc) ( Paper Presentation )
Abstract: Rapid developments in the field of power electronic devices with turn off capability like insulated gate bipolar transistors (IGBT) and gate turn off transistors (GTO), makes the voltage source converters (VSC) getting more and more attractive for High voltage direct current transmission (HVDC).This new innovative technology provides substantial technical and economical advantages for direct applications compared to conventional HVDC transmission systems based on thyristor technology. VSC Application for HVDC systems of high power rating (up to 200MW) which are currently in discussion for several projects are mentioned. The underlying technology of VSC based HVDC systems, its Characteristics and the working principle of VSC based HVDC system are also presented. This paper concludes with a brief set of guidelines for choosing VSC based HVDC systems in today’s electricity system development.

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Constraint – Based Maintenance Scheduling On An Electric Power – Distribution Network

Paper Presentation on  Constraint – Based Maintenance Scheduling On An Electric Power – Distribution Network ( Paper Presentation )
Abstract: The Exploitation of a power-distribution net work involves the scheduling of multiple maintenance and unforeseen repair tasks. The main resource is a net work subject to topological, economical and electric constraints.
A line section being maintained needs to be isolated from the rest of the network by opening all surrounding switches. Energized, which is unacceptable in most cases. Hence, these areas have to get there supply via some alternative way, i.e, service needs being restored closing switches connecting to an energized part of the network, taking into account overloading of branches, energy losses, and the cost of the necessary switching operations. Incase tasktasks are carried out in the same area ,switching operations might be shared among them. In some cases a valid net work reconfiguration might not even exist. Finally, typical scheduling constraints have to be met: resource of limited availability (man power ,vehicles etc.),view dates, priority relations ,etc. We present PLANETS, a prototype scheduler based on CHIP, generating never optimal schedules for the tasks to be carried out in one week making sure that ,at any movement in time the network is appropriately reconfigured to guarantee power supply to all consumers. The minimization criterion involves lateness, priority and total cost of the necessary switching operations.

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Decentralised Architecture for Power Electronic System Design Based on Bionics

Paper Presentation on  Decentralized Architecture for Power Electronic System Design Based on Bionics ( Paper Presentation )
Abstract: This paper proposes a novel bionic approach for enhancing reliability of power electronic system by utilizing some principles including autonomous decentralized architecture inspired from human body system. The application of bionics in power electronics is innovative from the methodological point of view. Finally a single phase full-bridge power inverter based on autonomous decentralized architecture is investigated. The investigated inverter has advantages in reliability, flexibility and user-friendliness compared to conventional centralized power converters. The proposed autonomous decentralized architecture in this paper has a promising prospect and paves the way towards future Plug and Play power electronic systems for so many significant advantages .This paper studies reliability principle in human body system and applies it to the design of power electronic system requiring high reliability. A single phase full-bridge inverter based on autonomous decentralized architecture is investigated in the method of PEB. The designed converter has advantages in reliability and flexibility compared to conventional power converter .The goal of this paper is to provide some novel ideas for designing high reliable power system based on PEB and to stimulate further discussion on application of bionics in power electronics from the methodological point of view.

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Development & Implementation of Direct Torque Control Scheme for Three Phase Induction Motor Drives using MATLAB

Paper Presentation on  Development & Implementation of Direct Torque Control Scheme for Three Phase Induction Motor Drives using MATLAB  ( Paper Presentation )
Abstract: Induction Motors (IM) has always been preferred for its reliability, ruggedness and easier in maintenance. The IM drives controlled with the vector control method has found wide acceptance in the industry. However, this control technique requires complex coordinate transformation, inner current control loop and accurate system parameters. The direct torque control (DTC) method provides robust and fast torque response without such coordinate transformations, PWM pulse generation and current regulators. Moreover, DTC minimizes the use of motor parameters. This paper presents a study of DTC technique for voltage source inverter fed induction motor drives using MATLAB. The Simulink model and results that validates the DTC principle has been presented. This paper proves that DTC technique is easier to implement and keeps the variable within the range.

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Microcontroller Based Automatic Railway Gate Control

Paper Presentation on  Automatic-Gate control  ( Paper Presentation )
Abstract: The objective of  this paper is to provide an automatic railway gate at a levelcrossing replacing the gates operated by the gatekeeper. It deals with two things. Firstly, it deals with the reduction of time for which the gate is being kept closed. And secondly, to provide safety to the road users by reducing the accidents.

 By the presently existing system once the train leaves the station, the stationmaster informs the gatekeeper about the arrival of the train through the telephone. Once the gatekeeper receives the information,he closes the gate depending on the timing at which the train arrives. Hence, if the train is late due to certain reasons,then gate remain closed for a long time causing traffic near the gates.

By employing the automatic railway gate control at the level crossing the arrival of the train is detected by the sensor placed near to the gate. Hence, the time for which it is closed is less compared to the manually operated gates and also reduces the human labour. This type of gates can be employed in an unmanned level crossing where the chances of accidents are higher and reliable operation is required. Since, the operation is automatic, error due to manual operation is prevented .

Automatic railway gate control is highly economical microcontroller based arrangement, designed for use in almost all the unmanned level crossings in the country.

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Antilock-Braking System Using Fuzzy Logic

Paper Presentation on  Antilock-Braking System Using Fuzzy Logic  ( Paper Presentation )
Abstract: This paper deals with study and tests on an experimental car with antilock-braking system (ABS) and vehicle speed estimation using fuzzy logic. Vehicle dynamics and braking systems are complex and behave strongly non-linear which causes difficulties in developing a classical controller for ABS. Fuzzy logic, however facilitates such system designs and improves tuning abilities. The underlying control philosophy takes into consideration wheel acceleration as well as wheel slip in order to recognize blocking tendencies. The knowledge of the actual vehicle velocity is necessary to calculate wheel slips. This is done by means of a fuzzy estimator, which weighs the inputs of a longitudinal acceleration sensor and four wheel speed sensors. If lockup tendency is detected, magnetic valves are switched to reduce brake pressure. Performance evaluation is based both on computer simulations and an experimental car. To guarantee realtime ability (one control cycle takes seven milliseconds) and to relieve the electronic control unit (ECU), all fuzzy calculations are made by the fuzzy coprocessor SAE 81C99A. Measurements in the experimental car prove the functionality of this automotive fuzzy hardware system.

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