Performance Evaluation of 3Ø Transmission networks with Multistate Switching Cells

Authors:- G Gopaiah, K Ashok Kumar

Abstract:- This paper exhibits a three-stage multilevel power factor rectification (PFC) rectifier utilizing multistate switching cells. A summed up converter structure is displayed in view of the connection of exchanging systems of Vienna-sort rectifier topologies through multi inter phase transformers (MIPTs). The resulting rectifier presents the natural advantages to the utilized building blocks and the ones included by a secluded development that enables the diminishment of uninvolved segments and general misfortunes. The operation of the PFC rectifier is depicted, including appropriate modulation and control procedures. Plan rules for the magnetic components are determined for the MIPTs, help inductors, and power semiconductor gadgets. At long last, a lab model is utilized to present exploratory outcomes. This model is evaluated at 7.5 kW and utilizes a secluded structure to amass a four legs for each phase rectifier. Proficiency over 98% from 40% load and IEC61000-3-2requirements are watched.

Fuzzy based Hybrid Distributed System Integration with grid

Authors:- G Vijaya Surekhar, V N Malleswari

Abstract:- This paper depicts about vulnerabilities relief in joining of sun oriented power era and geothermal power era utilizing voltage source converter (VSC) PI controller. The power era of PV framework is persistently varies, because of this HVDC back-back association is utilized for coordination. The principle preferred standpoint of HVDC is powerless matrix reconciliation; this situation is beneficial for WECS joining. VSC based all inclusive scaffold inverter with PI controller is utilized. The DC stack adjusting is finished with battery vitality stockpiling framework (BESS).

A Novel controller for Enhancement of MMC performance

Authors:- T Praveena, K Ashok Kumar

Abstract:- The measured multilevel converter (MMC) is an emerging topology for high-control applications and is considered as the improvement pattern of the high-voltage control converters. In this paper, general usage of the stage moved carrier adjustment with a capacitor voltage adjusting strategy for MMC is initially presented. At that point, the numerical examination of PS modulation for MMC is performed to recognize the PWM harmonic characteristics of the yield voltage and the circling current. Moreover, impact of the transporter relocation edge amongst the upper and lower arms on these music is additionally contemplated. Using this examination, the ideal relocation points are determined for the output voltage harmonics minimization and the coursing current harmonics cancelation, individually. The symphonious elements of the line-to-line voltage and the dc-connect current are likewise investigated. Moreover, an expansion of the PSC adjustment for MMC with full-connect sub-modules is additionally proposed which can increment the equivalent exchanging recurrence of the yield voltage and circulating current by two times contrasted and the regular MMC. Finally, the discoveries are checked tentatively on a model of MC.

SVPWM based Multilevel Boost converter for PFC correction

Authors:-D Bhavani, N Balakrishna

Abstract:-This paper presents a PR controller with SVPWM rectifier with power consider redress (PFC) in view of a modified three-level lift converter topology. In correlation with the ordinary lift based frameworks and other multi-level arrangements the new PFC rectifier has fundamentally littler inductor and lower exchanging misfortunes. The upgrades are accomplished by supplanting the yield capacitor of the lift converter with a non-symmetric dynamic capacitive divider and by using downstream converter arrange for the divider charge adjusting.

SoA Based Carry Lookahead Adder Using Reversible MZI

Authors:- Andiboyina Vijayasri, B. Murali Krishna

Abstract:- Carry look ahead adder (CLA) is the fastest of all adders and achieve speed through parallel carry computations. This method does not require the carry signal to propagate stage by stage. In this project, an efficient reversible implementation of Carry-Look ahead Adder (CLA) in all-optical domain is presented. Now-adays, semiconductor optical amplifier (SOA)- based Mach–Zehnder interferometer (MZI) plays a vital role in the field of ultra-fast all-opsoa-based-carry-lookahead-adder-using-reversible-mzitical signal processing. We have used all optical based Mach-Zehnder Interferometer (MZI) switches to design the CLA circuit implementing reversible functionality. The design of reversible circuit with optical technology can be implemented using Semiconductor Optical Amplifier (SOA) based Mach-Zehnder Interferometer (MZI) switch, which has significant advantages of high speed, low power, fast switching time and ease of fabrication. A conventional carry select adder is still power consuming due to the dual ripple carry adder structures having cin as ‘0’ and ‘1’. An efficient method which replaces the ZCLA instead of RCA with cin=’0’in the conventional CSLA is efficient and this CLA with the Mach zehnder interferometer technique can be more helpful and advantageous for the digital optical fibre communications.

Authentication of Ranking Deceit for Mobile Apps

Authors:- Yalavarthipati Shaik Reshma, B Lakshmikanth

Abstract:- The Mobile App is a very popular and well known concept due to the rapid advancement in the mobile technology. Due to the large number of mobile Apps, ranking fraud is the key challenge in front of the mobile App market. Ranking fraud refers to fraudulent or vulnerable activities which have a purpose of bumping up the Apps in the popularity list. While the importance and necessity of preventing ranking fraud has been widely recognized. In the existing system the leading event and leading session of an app is identified from the collected historical records. Then three different types of evidences are collected from the user feedbacks namely ranking based evidence, rating based evidence and review based evidence. These three evidences are aggregated by using evidence aggregation method. In the proposed system additionally, we are proposing two enhancements. Firstly, we are using Approval of scores by the admin to identify the exact reviews and rating scores. Secondly, the fake feedbacks by a same person for pushing up that app on the leader board are restricted. Two different constraints are considered for accepting the feedback given to an application. The first constraint is that an app can be rated only once from a user login and the second is implemented with the aid of IP address that limits the number of user login logged per day. Finally, the proposed system will be evaluated with real-world App data which is to be collected from the App Store for a long time period.
Active periods, namely leading sessions, of mobile Apps. Such leading sessions can be leveraged for detecting the local anomaly instead of global anomaly of app rankings. Furthermore, we investigate three types of evidences, i.e., ranking based evidences, rating based evidences and review based evidences, by modeling apps’ ranking, rating and review behaviors through statistical hypotheses tests.
In Rating Based Evidences, specifically, after an App has been published, it can be rated by any user who downloaded it. Indeed, user rating is one of the most important features of App advertisement. An App which has higher rating may attract more users to download and can also be ranked higher in the leader board. Thus, rating manipulation is also an important perspective of ranking fraud. In Review Based Evidences, besides ratings, most of the App stores also allow users to write some textual comments as App reviews. Especially, this paper proposes a simple and effective algorithm to recognize the leading sessions of each mobile App based on its historical ranking records. This is one of the fraud evidence. Also, rating and review history, which gives some anomaly patterns from apps historical rating and reviews records.
The rest of the paper is organized as follows: Section II, presents the literature survey over the related work. In section III, proposed system is presented in section IV, implementation for each modules. Finally, the section V concludes the review paper.

Auditing Cloud Information using Control Attribute Based Encryption System

Authors:- Suvarchala Chinta, B Vanaja Kumari

Abstract:- Cloud storage services have become increasingly popular. Because of the importance of privacy, many cloud storage encryption schemes have been proposed to protect data from those who do not have access. All such schemes assumed that cloud storage providers are safe and cannot be hacked; however, in practice, some authorities (i.e., coercers) may force cloud storage providers to reveal user secrets or confidential data on the cloud, thus altogether circumventing storage encryption schemes. In this paper, we present our design for a new cloud storage encryption scheme that enables cloud storage providers to create convincing fake user secrets to protect user privacy. Since coercers cannot tell if obtained secrets are true or not, the cloud storage provider ensure that user privacy is still securely protected.

Modular Multilevel Converter based Dynamic Performance Improvement of PMSM

Authors:-Venkata Anusha Ongolu, P.Syam kumar

Abstract:-This paper presents improvement of dynamic performance of permanent magnet synchronous machine using modular multilevel converter. This paper proposes a control strategy for the robust dynamic response of MMC even at zero output frequency employing leg offset voltage injection. The leg offset voltage for balancing the arm energy is produced by direct calculation without the circulating current control loop controller. Thanks to the highly dynamic leg offset voltage from direct calculation and not conventional circulating current controller, the dynamic performance of the MMC at low speeds has conspicuously improved. The AC machine has been driven from standstill to rated speed without excessive cell capacitor voltage ripples utilizing this proposed strategy. The simulation results verify that stable operation is guaranteed down to less than 2 % of the rated speed under 40% step load torque disturbance.

Sensor less Speed Control of Induction Motor with Slide Mode Technique

Authors:-Nagalakshmi Chilukoti, P.Syam kumar

Abstract:-A sensorless control scheme is presented for induction motor with core loss and anon linear model is developed in well known (α, β) stationary reference frame, where the core is represented with a resistance in parallel with a magnetization inductance. An optimal rotor flux modulus is calculated by minimizing copper and core loss. This flux modulus is forced to be tracked by the induction motor along with a desired rotor velocity by means of sliding mode observer by using the super twisting algorithm. The rotor velocity is estimated by two methods. The first consist of a super twisting sliding mode observer for rotor fluxes with the purpose of retrieving the back-electromotive force components by means of the equivalent control method. The second method is based on a generalization of the phase – locked loop methodology. PI controller is used in both the technique. The robustness of the system is checked by varying the stator, rotor and core resistances.

Predictive Control for Harmonic and Unbalance Compensation using Active Power Filter

Authors:-Venkata Krishna Medah, P Syam Kumar

Abstract:-An active power filter implemented with a four leg voltage-source inverter using dq-based Current Reference Generator scheme is presented. The use of a four-leg voltage-source inverter allows the compensation of current harmonic components, as well as unbalanced current generated by single-phase nonlinear loads.The grid interfacing can thus be utilized as:1)power converter to inject power generated from rest the grid, and 2)shunt APF to current unbalance, load current harmonics and load reactive power demand. The compensation performance of the proposed active power filter and the associated control scheme under steady state and transient operating conditions is demonstrated through simulations results.