Paper Title

AN UNBALANCED AC SOURCE THREE-PHASE CONVERTER POWER CONTROLLABILITY USING FUZZY CONTROLLER

Abstract

At present scenario, renewable energy sources become an alternative source of energy for future energy demand and to mitigate environment pollution problems. Grid connected renewable energy source like wind energy system uses power electronics converters as an interfacing device between wind energy system and utility grid. These converters are commonly based on a voltage source inverter (VSI) connected to the supply network, operated to achieve objectives such as power flow regulation with unity power factor operation. However, intermittent nature of wind energy must be controlled to meet the grid requirements. The grid requirements include independent control of active & reactive power, improved power quality, grid synchronization and Good transient response during fault conditions etc. Usually voltage oriented control (VOC) of grid side converter in the synchronous reference frame was universally adapted for independent control of active and reactive power of the grid. However, the dynamic response during abnormal condition of grid is sluggish and poor power quality. In order to design controller for robust performance and to know the control characteristics, VSI needs to be accurately modelled. This project has taken an attempt to derive the small signal model of a single phase inverter in isolated mode and its performance with different controllers. Further, the work is extended to modelling of three phase grid connected VSI and its relevant transfer functions have been deduced from the model so as to analyse the system performance for designing a controller through wellknown bode plots. The studied system is modelled and simulated in the MATLAB-Simulink environment.
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Paper Title

SIMULATION OF PERTURB AND OBSERVE BASED MAXIMUM POWER POINT TRACKING ALGORITHMS FOR PHOTOVOLTAIC SYSTEM

Abstract

The human activities contribute to the global warming of the planet. As a result, every country strives to reduce carbon emissions. The world is facing not only the depletion of fossil fuels, but also its rising prices which causes the worldwide economic instability. Numbers of efforts are being undertaken by the Governments around the world to explore alternative energy sources and to achieve pollution reduction. Solar electric or photovoltaic technology is one of the biggest renewable energy resources to generate electrical power and the fastest growing power generation in the world. The main aim of this work is to analyze the interface of photovoltaic system to the load, the power electronics and the method to track the maximum power point (MPP) of the solar panel. The first chapter consists of an overview of the PV market and cost. It describes the application of the PV system, the energy storage and the different standard requirement when having grid-connected PV system. Then main emphasis is to be placed on the photovoltaic system, the modeling and simulation photovoltaic array, the MPP control and the DC/DC converter will be analyzed and evaluated. The step of modeling with MATLAB and Simulink of the photovoltaic system is shown respectively and simulation results are provided. iii The Simulink model of the PV could be used in the future for extended study with different DC/DC converter topology. Optimization of MPPT algorithm can be implemented with the existing Photovoltaic and DC/DC converter.
KEYWORDS : Photovoltaic Array (PVA), MPPT, Ćuk Converter.

Paper Title

ESTIMATED DROOP CONTROL FOR GRID-CONNECTED DUAL VOLTAGE SOURCE INVERTERS

Abstract

Renewable Energy Sources (RES) are considered as the replacement of conventional energy sources. These RES can use wind energy, solar light, bio waste and can also be in the form of small hydro power units. These RES has very poor power quality and contains voltage fluctuations and variable frequency. These factors make RES a stability risk for the main utility grid. As a solution, currently inverters with different design techniques are being used as an interface between RES and main utility grid. The current study proposed a new technique ”estimated droop control” for inverter design. The conventional droop control technique which was already used in inverter design, has difficulty in synchronizing parallel connected inverters with different droop gains and line impedances. The proposed ”estimated droop control” does not use any predefined droop values for inverters and all inverters are responsible for the estimation of their own droop values with respect to their output power. Therefore, inverters are not bound to use same and static droop values which are considered as a vital communication link. The proposed design methodology has made inverters independent from this only virtual link of communication due to which the reliability of a system has increased. The proposed design technique has given very good results in a simulation run.
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Paper Title

CONTROL AND OPERATION OF WIND-POWER AND WAVE-POWER GENERATION SYSTEMS USING A DC MICRO GRID USING FUZZY CONTROLLER

Abstract

This paper presents analysis of power flow management in wind power and wave power. This paper proposed an integrated wind and wave power generation system fed to an ac power grid or connected with an isolated load using a dc microgrid using FUZZY controller. The proposed dc microgrid connects with a wind power generator through a voltage -source converter (VSC), a wave power generator through a VSC, an energy storage battery through a bidirectional dc/dc converter, a resistive dc load through a load dc/dc converter, and an ac power grid through a bidirectional grid - tied inverter. The studied integrated wind and wave system joined with the dc microgrid is modeled and simulated using MATLAB/Simulink model design reveals that the proposed integrated control systemcan maintain stable operation to supply power under different operating conditions using the proposed dc microgrid by varying duty ratios of individual converter and pitch angle of wind system is shown.
KEYWORDS : Wind power, Wave power, fuzzy control, Battery storage, Micro grid

Paper Title

REDUCING THE FAULT CURRENT AND OVERVOLTAGE FOR POWER SYSTEM PROTECTION THROUGH AN ACTIVE TYPE SFCL

Abstract

Utilization of renewable energy resources is the demand of today and the necessity of tomorrow. For a power distribution system with DG units, its fault current and induced overvoltage under abnormal conditions should be taken into account seriously. In consideration that applying superconducting fault current limiter (SFCL) may be a feasible solution. Distributed Generation Resources are increasingly used in distribution systems due to their great advantages. The presence of DG, however, can cause various problems such as miss-coordination, false tripping, blinding and reduction of reach of protective devices. Using superconducting fault current limiters (SFCLs) is one of the best methods to minimize these problems comparing to the other conventional methods. The active SFCL can as well suppress the short-circuit current induced by a three-phase grounded fault effectively, and the power system’s safety and reliability can be improved and it is composed of an air core superconducting transformer and a PWM converter. The magnetic field in the air-core can be controlled by adjusting the converters output current, and then the active SFCLs equivalent impedance can be regulated for current limitation and possible overvoltage suppression. During the study process, in view of the changes in the locations of the DG units connected to the system, the DG unit’s injection capacities and the fault positions, the active SFCLs current limiting and over voltages suppressing characteristics are presented by using Matlab/Simulink software. Keywords: Distributed Generation (DG), Distribution System, Short-Circuit Current, Voltage Compensation Type Active Superconducting Fault Current Limiter (SFCL).
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Paper Title

ACTIVE WITH UNIVERSAL VERIFICATION OF IMPARTIAL SETTLEMENT IN CLOUD DATA

Abstract

Cloud users no longer have actual data, so how to ensure the integrity of data obtained from external sources Mission Challenge. Recent proposed schemes such as \"acquisition of verifiable data\" and \"recovery evidence\" have been designed to address it this problem, however, is designed to validate static archive data and thus lack support for data dynamics. Moreover, threat models in the schemas usually assume a reliable data owner and focus on discovering a dishonest cloud provider despite the fact Customers may also misbehave. This paper proposes a general audit scheme with support for data dynamics and fairness arbitration Potential conflicts. In particular, we design a converter indicator to eliminate the reduction of indexing use in the calculation of the tag in the current Schemes and efficient handling of data dynamics. To address the problem of equity so that no party can act without it When we discover, we expand existing threat models and adopt the idea of signature exchange to design fair arbitration protocols, so that Any possible dispute can be resolved to some extent. Security analysis shows that our software is stable and performance-based Demonstrates overhead data dynamics and reasonable dispute arbitration.
KEYWORDS : Fair Arbitration, Integrity Auditing, Cloud data verification

Paper Title

PROTECTED WITH PROFICIENT DATA STATEMENT PROTOCOL IN WBANS

Abstract

WBANs are expected to play a key role in patient health surveillance In the near future, which have received considerable attention among researchers in recent years. One of the challenges is to establish a safe Communication architecture between sensors and users, while addressing security concerns and prevailing privacy. In this paper, We suggest a communication architecture for BANs, and a diagram design to secure data connections between implants Wearable sensors and data / data consumers (physicians or nurses) by using Cipher text-Policy-based encryption (CP ABE) [1] and signature to store data in the format of cipher text in the data bin, thus ensuring data security. Our plan achieves Role-based access control through the use of an access control tree defined by data attributes. We also design two protocols for Retrieve sensitive data from BAN and guide sensors in BAN. We analyze the proposed scheme, and say it provides a message of originality and resistance to collusion, which is effective and possible. We also evaluate their performance in terms of Energy Consumption and Communications / Expense Account.
KEYWORDS : Tree Access Control scheme, Wireless Body Area Networks, Attribute based Encryption.

Paper Title

SENTIMENTALITY WORDS EXTRACTING USING SENTIMENT LEVEL EVIDENCES

Abstract

Word Embedding’s are usually learned from unencrypted plain text and provide a heavy vector representation of grammatical / semantic aspects of the word. We suggest getting to know the phrases for embedding, that\'s referred to as ethical inclusion on this paper. The present phrase the use of getting to know algorithms isn\'t restrained to using word contexts, but rather to the sense of texts. It\'s tricky for emotions Analysis because phrases with similar but opposite contexts, along with suitable and terrible, are plotted to the neighborhood Word Vector. We cope with this hassle by way of encoding the emotion information of the texts (eg, sentences and words) with contexts Words in feelings encompass. By combining proof at the extent of context and emotions, the closest pals are embedding emotions the space is comparable collectively, and the phrases choose the equal feel of polarization. In order to discover ways to combine emotions efficiently, we develop some of neural networks with lossless stitching capabilities, and acquire big texts mechanically with emotion alerts such as Feelings as training records. Moral implications can normally be used as word houses for a diffusion of emotion analysis responsibilities without exceptional geometry. We practice ethical inclusion to investigate emotions at the word stage, classify feelings at the wholesale degree, and Build enthusiasts of feelings. Empirical consequences display that morale synchronization continuously outweighs the context Implications for multiple database corporations of those duties. This paintings affords insights on the layout of neural networks for mastering Word forests are challenge particular in different herbal language processing duties.
KEYWORDS : Sentiment Embedding, word Embedding, Neural networks.