Real time experiment of grid connected pv system

Authors:- Ravi babu; krishna kumar

Abstract:- This paper presents a method to identify power system impedance in real-time using signals obtained from grid connected power electronic converters. The proposed impedance estimation has potential applications in renewable/distributed energy systems, STATCOM, and solid state substations. The method uses wavelets to analyze transients associated with small disturbances imposed by power converters and determine the net impedance back to the source. A data capture period of 5 ms is applied to an accurate impedance estimation which provides the possibility of ultra fast fault detection (i.e., within a half cycle). The paper describes how the proposed method would enhance the distributed generation operation during faults.

Voltage unbalance compensation in a Microgrid tied grid

Authors:- raju k, Narayana Murthy

Abstract:- The concept of microgrid hierarchical control is presented recently. In this paper, a hierarchical scheme is proposed which includes primary and secondary control levels. The primary level comprises distributed generators (DGs) local controllers. The local controllers mainly consist of power, voltage and current controllers, and virtual impedance control loop. The central secondary controller is designed to manage the compensation of voltage unbalance at the point of common coupling (PCC) in an islanded microgrid. Unbalance compensation is achieved by sending proper control signals to the DGs local controllers. The design procedure of the control system is discussed in detail and the simulation results are presented. The results show the effectiveness of the proposed control structure in compensating the voltage unbalance.

Artificial Intelligence Based Security System

Authors:- Mahesh K, Naga raju p

Abstract:-Embedded Intelligent Security System project is developed for the users to give very high security to modern houses. It mainly consists of four IR transducers, microcontroller unit, LCD display, Stepper motor and telephone circuit.The four sensors are connected at the four sides of the house. When any one enters inside the compound, the sensor sends signal to the microcontroller. The microcontroller analyses the signal and recognize the particular side. Accordingly it controls a stepper motor and also sends signal to a buzzer, Telephone circuit and LCD display. A top light is connected with the stepper motor. Thus the stepper motor rotates the top light to the particular side. The LCD display displays the details. The telephone circuit makes a call to the owner.Since the owner can easily understand the happenings while sitting inside the house, this project gives very high security.

Secured Wireless Data Communication

Authors:-Suresh mela; Suryanarayana

Abstract:-The STT-433 is ideal for remote control applications where low cost and longer range is required. The transmitter operates from a 1.5-12V supply, making it ideal for battery-powered applications. The  transmitter  employs  a  SAW-stabilized  oscillator,  ensuring accurate  frequency  control  for  best  range  performance.  Output power and harmonic emissions are easy to control.  The manufacturing-friendly SIP style package and low-cost make the STT-433 suitable for high volume applications.

DTC based loss minimization of an induction motor

Authors:- Sampath T, krishna kanth

Abstract:-This paper describes a combination of direct torque control (DTC) and space vector modulation (SVM) for an adjustable speed sensorless induction motor (IM) drive. The motor drive is supplied by a two-level SVPWM inverter. The inverter reference voltage is obtained based on input-output feedback linearization control, using the IM model in the stator – axes reference frame with stator current and flux vectors components as state variables. Moreover, a robust full-order adaptive stator flux observer is designed for a speed sensorless DTC-SVM system and a new speed-adaptive law is given. By designing the observer gain matrix based on state feedback  control theory, the stability and robustness of the observer systems is ensured. Finally, the effectiveness and validity of the proposed control approach is verified by simulation results.

A Framework for Secure Computations With Two Non-Colluding Servers and Multiple Clients,Applied to Recommendations

Authors: Prem Kumar V, Venkata Ramana

Abstract:-We provide a generic framework that, with the help of a preprocessing phase that is independent of the inputs of the users, allows an arbitrary number of users to securely outsource a computation to two non-colluding external servers. Our approach is shown to be provably secure in an adversarial model where one of the servers may arbitrarily deviate from the protocol specification, as well as employ an arbitrary number of dummy users. We use these techniques to implement a secure recommender system based on collaborative filtering that becomes more secure, and significantly more efficient than previously known implementations of such systems, when the preprocessing efforts are excluded. We suggest different alternatives for preprocessing, and discuss their merits and demerits.