Electrical and Electronics

Image inpainting is the science of filling in the missing or damaged area of an image from the enclosing area’s information. Its purpose is to recover images with limited data loss and tries to obtain inpainting outputs of damaged parts in such a way that the recovered images look usual. In our proposed method we will divide the damaged portion of image in the form of reference pixel according to their dissipating property. Then by applying image inpainting we have obtained an image whose visuable quality is identical to cover image.

This paper presents optimal cross section selection of MV feeders in radial power distribution system planning to reduce power loss and improve voltage profile using genetic algorithm. To analysis the steady state of network in each step of optimization, a direct approach load flow which is both robust and efficient and has high convergence speed is used. In this paper, feeder cross section selection will be performed considering the economic, power loss, and energy loss factors so that, constraints like maximum current capacity of feeders and allowed voltage drop of nodes are satisfied. The obtained result of feeder cross section selection problem will be close to absolute optimum point because of using genetic algorithm as an optimization tool. The proposed method is implemented on MATLAB software environment and through numerical example the validity of proposed method is verified.

Water supply payment system is old fashioned has many problem and need improvement. In this paper a new approach was designed that is based on pay method where you buy amount of water in advance. Water companies have difficulties in accessing conventional water meters in remote places. Inefficiency is increased with growing number of population .It has high cost and difficulties in delivering water bills. This paper discusses a pre-paid SMS based water dispensing system that solves these problems by allowing the amount of flow of water pre-paid to pass through based on low cost intelligent control system that uses microcontroller, solenoid valve, turbine flow meter and GSM server. This system accurately controls the amount of water paid for in advance without human intervention or need for conventional water meters by turning solenoid valve on and allowing certain amount of water to pass through the flow meter until credit expires shutting the solenoid valve. The software application provides real time information about the credit left and quantity of water consumed both locally on LCD and remotely by SMS server as well as date and time and validity of credit if applicable.

This paper presents a microcontroller based series parallel resonant converter suitable for the single stage single phase power factor correction circuits. The performance of the proposed converter is improved from no-load up to full-load. The steady state characteristics of the proposed converter are developed and a design example is given in detail. The proposed converter allows zero voltage switching at any loading condition with a reasonable power factor and with a promising efficiency. Simulation and experimental results verify the analysis made and the design specifications.

In this paper, an attempt has been made to develop a new algorithm for distribution system planning. The proposed algorithm does not require prior knowledge of candidate substation location and can obtain the “number, location and service area” of HV/MV substations, the optimal feeder configuration and the optimal sizes of branch conductors while satisfying constraints such as current capacity, voltage drop and heuristic rules. Several algorithms are proposed for distribution systems planning. A comprehensive algorithm is developed for obtaining the optimal “number, location and service area” of substation using GA and a generalized algorithm is modified to optimal feeder path on minimum loss criterion. Direct approach load flow is used for solving radial distribution networks and branch conductor optimization algorithm. The load flow algorithm and branch conductor optimization techniques are used as subroutine in the generalized distribution systems planning algorithm. Through numerical example the validity of proposed method is verified.

The high growth of the semiconductor industry over the past two decades has put Very Large Scale Integration in demand all over the world. Digital Signal Processing has played a great role in expanding VLSI device area. The recent rapid advancements in multimedia computing and high speed wired and wireless communications made DSP to grab increased attention.For an N-point transformation the direct computation of the Discrete Fourier Transform (DFT) requires N2 operations. Cooley and Turkey explained the concept of Fast Fourier Transform (FFT) which reduces the order of computation to Nlog¬2N. The FFT is not an approximation of the DFT, it's exactly equal to the DFT. FFT decomposes the set of data to be transformed into a series of smaller data sets to be transformed. The size of FFT decomposition is called "radix". Then, it decomposes those smaller sets into even smaller sets. At each stage of processing, the results of the previous stage are combined with twiddle factor multiplication. Finally, FFT is calculated for each small data set. Generally, FFT's can be decomposed using DFT's of even and odd points, which is called a Decimation-In-Time (DIT) FFT, or they can be decomposed using a first-half/second-half approach, which is called a "Decimation-In-Frequency" (DIF) FFT.A large number of FFT algorithms have been developed, but among all radix-4 are most widely used for practical applications due to their simple architecture, with constant butterfly geometry and the possibility of performing them ‘in place’. The algorithm for 16-point radix-4 FFT can be implemented with decimation either in time or frequency. In this work, the decimation in time (DIT) technique will be adopted in order to implement the 16-point radix-4 FFT.

Self-Organizing Map (SOM) can be used to quickly create a qualitative overview of the data. It maps nonlinear statistical relationships among different variables of a high dimensional input data on a low dimensional network, preserving most of the topographic relationships from the input space. Hence, for dealing the complex problem of separation of incipient faults of highly overlapping nature, an epistemological decision making approach using SOM is proposed in this paper.

This paper presents the non-linear control of an induction motor (IM). The objective of nonlinear control is to can control separately flux and the speed, several techniques of control are used for (IM), The technique of control oriented flux (FOC) which permits the decoupling between input and output variables, so (IM) is assimilate to continuous current motor , this method has a problem is how exactly oriented the axis d on the flux .However, feedback linearization amounts to cancelling the nonlinearities in a nonlinear system so that the closed- loop (CL) dynamics is in a linear form . A goal of feedback linearization is to can controlled separately flux and the speed ,the motor model is strongly nonlinear then it’s composed to the autonomous and mono-variables too under systems so every under system presented an independence loop of control for each variables is given . The space vector modulation [SVM] method gives a good tracking for the non linear control, SVM became a standard for the switching power converters and important research effort has been dedicated, tens of papers, research reports and patents were developed in the theory of space vector modulation.

Environmental friendly energy system is going to develop compared to convectional primary energy due to energy security problems. As the cost of solar energy is zero, the demand of solar energy is gradually increased in different purposes such as electricity, cooling and so on. Moreover, in the energy market, Photovoltaic (PV) inverters bear a very important role due to cost and efficiency. Hence, Transformer (TRX)-less inverter system is part and parcel where possible to reduce the overall system cost, size with high efficiency. In this review paper, different TRX-less inverter topologies are focused with the different switching conditions and the process of Leakage Current Reduction (LCR). Here is shown the basic concept of PV panel, flow chart according to the review papers, different leakage current paths and the mitigation processes.

A significant increase of the electrical equipment in modern aircrafts is leading to an increase in the demand for electrical power. The usual electrical power distribution in aircraft applications is done via a three-phase 415 Vac grid. A new trend of DC distribution is emerging employing a 270 Vdc grid. With the advancement in the power semiconductor devices and power transformers, DC-DC converters are designed with frequency ranging up to MHZ range. Increase in the switching frequency along with the sudden change in the current di/dt or voltage dv/dt generates higher order harmonics which leads to Electro Magnetic Interference (EMI). EMI noise creates malfunctioning of the circuit and also leads to miscommunication within the system and sometimes leads to device failure. Which is an undesirable condition as far as airline is considered. Hence the reduction of EMI noise is of uttermost important. This paper focus on the reduction of EMI using passive filter along with modified PWM carrier modulation technique. A circuit model for the prediction of conducted emissions due to DC/DC converters in an aircraft black box system is proposed and corresponding attenuation method is been analyzed.