Development of Power Flow Controller for Grid Connected Renewable Energy Sources Using Lyapunov function

Vol.1  No.4

Year: 2014

Issue : Nov-Jan

Title : Development of Power Flow Controller for Grid Connected Renewable Energy Sources Using Lyapunov function

Author Name : Kalaiselvi K, Sowthamani R

Synopsis :

The three phase inverter is proposed to control the active and reactive power flow from the renewable energy source to a three phase generalized micro grid system. The proposed control system not only controls the grid power flow but also reduces the grid current total harmonic distortion in the presence of typical nonlinear loads. The control system shapes the grid current taking into account the grid voltage unbalance, harmonics as well as unbalance in line side inductors. The stability of the control system is ensured by the direct method of Lyapunov. SRC is also proposed to improve the performance of the current controller by estimating the periodic disturbances of the system. The proposed control system (implemented digitally) provides superior performance over the conventional multiple proportional-integral and proportional-resonant control methods. A new inverter modelling technique is also presented to take care of unbalances both in grid voltages and line side inductors.

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A High Speed Low Power CAM with Power-Gated Match Line Sensing Using Keyword-Based Search Method

Vol.1  No.4

Year: 2014

Issue : Nov-Jan

Title : A High Speed Low Power CAM with Power-Gated Match Line Sensing Using Keyword-Based Search Method

Author Name : Shanmugapriya M, Shenbagapariya M

Synopsis :

The design of high speed Content Addressable Memory (CAM) offers high-speed search function in a single clock cycle. Content Addressable Memory (CAM) is a type of solid-state memory in which data are accessed by their contents rather than physical locations. It receives input search data, i.e., a search word, and returns the address of a similar word that is stored in its data-bank. In previous system, we introduced a parity bit that leads to sensing delay and increase the power consumption. It takes more time to sense the match line. In this paper, we used keyword based search method. The concept of this method is to pre-compare several bits of the match line in advance. Through the mechanism of the keyword search pre-comparison scheme, it can decide that whether the other bits would be compared or not and which reduces even more sensing delay and reduce the power.

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Investigation and Analysis for Effectiveness of Various Types of Reflectors in Boasting the Output of Solar Photovoltaic Panel

Vol.1  No.4

Year: 2014

Issue : Nov-Jan

Title : Investigation and Analysis for Effectiveness of Various Types of Reflectors in Boasting the Output of Solar Photovoltaic Panel

Author Name : Md. Khademuzzaman, Nilufer Akter , Ruhul Amin

Synopsis :

Various methods have been practiced for boasting up the output of solar photovoltaic module. Tracking more sun rays on solar PV panel is one of the effective schemes for increasing up the output. This sun tracking can be possible though automatic sun tracker or reflection methods. Comparatively the reflection method has more simplicity in mechanism than automatic tracker. Tracking more sun rays with reflection process provided satisfactory result. In dealing with reflection method we have found various types of reflectors like white foam reflector, standard reflector, aluminum reflector etc. In this paper, we have demonstrated the effectiveness of various reflectors on solar PV panel at different angles. From this analytical paper we can determine the effective reflector to increase the output of solar PV panel.

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Hybrid EPSO-IPM based Optimal Power Flow with FACTS controllers for security enhancement considering credible network contingencies

Vol.1  No.4

Year: 2014

Issue : Nov-Jan

Title : Hybrid EPSO-IPM based Optimal Power Flow with FACTS controllers for security enhancement considering credible network contingencies

Author Name : Chunduri Rambabu, Y.P. Obulesu , Saibabu

Synopsis :

This paper presents hybrid Particle Swarm Optimization based method to solve optimal power flow in power systems incorporating FACTS controllers such as Thyristor Controlled Phase Shifter (TCPS), Thyristor Controlled Series Compensator (TCSC) and Unified Power Flow Controller (UPFC) for security enhancement under single network contingencies.A fuzzy contingency ranking method is used in this paper and observed that it effectively eliminates the masking effect when compared with other methods of contingency ranking. The fuzzy based network composite overall severity index is used as an objective to be minimized to improve the security of the power system. The proposed optimization process with EPSO-IPM is presented with case study example using IEEE 30-bus test system to demonstrate its applicability. The results are presented to show the feasibility and potential of this new approach.

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Contingency Analysis of Power System using MI-power Software

Vol.1  No.4

Year: 2014

Issue : Nov-Jan

Title : Contingency Analysis of Power System using MI-power Software

Author Name : Shekhappa Ankaliki, Vijay. Y. Patil , Naveenkumar R Kulkarni , Veeresh A. G

Synopsis :

This article presents contingency analysis of power system by Fast Decoupled Load Flow method using Mi-power software. In the modern days the power system is becoming wide and complex and hence system security is one of the challenging tasks for the operation engineers. Contingency Analysis (CA) is critical in power system analysis and it gives the knowledge about the system state in the event of a contingency. Contingency analysis technique is being widely used to predict the effect of outages like failures of equipment, transmission line etc, and to take necessary actions to keep the power system secure and reliable. The off line analysis to predict the effect of individual contingency is a tedious task as a power system contains large number of components. Practically, only selected contingencies will lead to severe conditions in power system. The process of identifying these severe contingencies is referred as contingency selection. In this work single line outage contingency case is analyzed for different loading conditions and demonstrated through IEEE 6-Bus System.

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OPTIMAL LOCATION AND SIZING OF CAPACITOR USING DIFFERENTIAL EVOLUTION

Vol.1 No.3

Year : 2013

Issue : Aug-Oct

Title : OPTIMAL LOCATION AND SIZING OF CAPACITOR USING DIFFERENTIAL EVOLUTION

Author Name : Dr. N Visali, J.V.Satish Kumar Reddy , SURENDRANATHA REDDY M

Synopsis :

Distribution system plays an important role in supplying the electricity from generation to the consumers via transmission system. The power system is one of the most complex systems in the world. Because of the high R/X value the losses in the distribution system is more. The one of the roles of capacitor is reducing the losses in the distribution system. This paper presents an improved method for capacitor placement with optimum size in radial distribution feeders to reduce the real power loss and to improve the voltage profile. In this paper, the total work is mainly divided in to three sections. In the first section load flow of the system. In the section –II location and size of the capacitors is determined by using Differential Evolution and In the section-III the results are compared with existing method which is proposed by the author.

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Detection and Analysis of Power Quality Disturbances using Continuous Wavelet Transform and Discrete Wavelet Transform Coefficients

Vol.1 No.3

Year : 2013

Issue : Aug-Oct

Title : Detection and Analysis of Power Quality Disturbances using Continuous Wavelet Transform and Discrete Wavelet Transform Coefficients

Author Name : ELVIN RICHARDS SODADASI, M.Saiveerraju

Synopsis :

Power quality (PQ) is an important issue to electricity consumers at all levels of usage. Specifically, industries requiring ultra-high availability of service and precision manufacturing systems are very sensitive to power quality problems. The very essential step before analyzing any power quality disturbances is detection. Recently, many power quality algorithms have been developed to detect and analyze different kind of power quality events or disturbances. In this paper investigations are carried out for different power quality issues using continuous and discrete time wavelet analysis.Results are simulated in MATLAB/SIMULINK.

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A Comparative Study of PFC: Bridgeless AC-DC Converter

Vol.1 No.3

Year : 2013

Issue : Aug-Oct

Title : A Comparative Study of PFC: Bridgeless AC-DC Converter

Author Name : NAGA SMITHA VEMULA, K Sreekanth , Dr. B P SINGH , P Sridhar

Synopsis :

With the fast growing information technologies, high efficiency AC-DC front-end power supplies are becoming more and more desirable in all kinds of distributed power system applications due to the energy conservation. However, the supply power factor in converters is low when output voltage is less than the maximum, as the firing angle is large. New recommendations and future standards have increased the interest in power factor correction (PFC) circuits. For improving power quality in terms of PFC, reduced total harmonic distortion at input AC mains and precisely regulated dc output in buck, boost, buck–boost and multilevel modes are cascaded to convert. This paper introduces a closed loop isolated bridgeless AC to DC converter with high power factor and compares different closed loop controls. The Closed loop control strategies using PI, PID and Fuzzy Logic Controllers are compared with simulated results.

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DISTRIBUTION SYSTEM RELIABILITY ASSESSMENT WITH DISTRIBUTED GENERATION

Vol.1 No.3

Year : 2013

Issue : Aug-Oct

Title : DISTRIBUTION SYSTEM RELIABILITY ASSESSMENT WITH DISTRIBUTED GENERATION

Author Name : Karanam Amaresh, V.Sankar

Synopsis :

Reliability assessment of a radial distribution system with a distributed generation is presented in this paper. Assessment of customer power supply reliability is an important part of distribution system operation and planning. DG distribution is likely to improve the reliability of a power distribution system by at least partially minimizing the chance of power interruptions to customers due to loss of utility generators or due to faults in transmission and distribution lines or equipment. DG is expected to improve the system reliability as its back up generation. Since, DG units are subject to failures like all other generation units, the random behavior of these units must be taken into account in the analysis. Existence of DG units in a distribution system will affect restoration time of load points. In this paper, an algorithm for assessing restoration time of load points for a radial distribution system with back up DG units is presented. A simple distributed load flow technique has been used for solving radial distribution network by placing DG and compared with base case. The location of DGs is attained based on the corresponding lowest voltage values at the particular load point. A sensitivity analysis is performed on a test system to examine the impact of DG units, their location and their number on reliability indices. The proposed approach is tested on an IEEE – 15 bus radial distribution system, the results are presented and analyzed.

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Three-Phase Non Isolated Interleaved Boost Converter

Vol.1 No.3

Year : 2013

Issue : Aug-Oct

Title : Three-Phase Non Isolated Interleaved Boost Converter

Author Name : Samuel Rajesh Babu, M. Sonai

Synopsis :

This paper presents a Three-phase Non isolated Inter leaved boost converter (IBC) for high step up operation. Three-phase IBC has a number of boost converters connected in parallel with same switching frequency. Three-phase IBC are highly preferred to reduce the ripple current. A boost converter is used to clamp the voltage stresses of all the switches in the Inter leaved converter which is caused by the leakage inductance. This paper focuses on the leakage energies of the interleaved converter and are collected in a clamp capacitor and then recycled to the separate load by the clamp boost converter. Simulation and experiment results have been performed to understand the efficiency of three-phase IBC and the results have been validated.

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Energy Conservation Techniques to Mitigate the Power Shortage Problem in Pakistan

Vol.1  No.2

Year: 2013

Issue: May-Jul

Title : Energy Conservation Techniques to Mitigate the Power Shortage Problem in Pakistan

Author Name : Dr. Suhail Aftab, Uzma Amin

Synopsis :

The main objective of this research paper is to show benefits of different energy conservation techniques. Different techniques are discussed in this paper and the most beneficial technique that is energy conservation by power factor improvement is analyzed in detail. As a first case study,I performed analysis on University of Gujrat, electrical power system. This case study involves analysis of motors and tube lights installed at the pumping stations and in Engineering Block of UOG respectively, with the help of energy analyzer before and after the installation of required rating capacitors. Power system analysis also done which includes power distribution system losses for example line losses and copper losses of different rating transformers of UOG. Cost and payback period calculation had been done. Cost of capacitors includes both static and automatic capacitors calculations. Second case study is performed on 11 KV Ali Park and Rachna Town feeders to show fruitful results obtained by implementing rehabilitation techniques on the above said feeders. FDRANA Software is used which is capable of calculating voltage drop, power losses and KVARS required for improving the power factor. The results showed by adopting energy conservation techniques not only energy is conserved, it also brings other benefits.

Sag/Swell and Load Reactive Power Compensation

Vol.1  No.2

Year: 2013

Issue: May-Jul

Title : Sag/Swell and Load Reactive Power Compensation

Author Name : B.Suresh kumar, B.Veeresalingam , praveena praveena

Synopsis :

This paper Introduces, a new concept of controlling complex power (simultaneous active and reactive powers) through series inverter of UPQC is introduced and named as UPQC-S. The proposed concept of the UPQC-S approach is mathematically formulated and analyzed for voltage sag and swell conditions. The developed comprehensive equations for UPQC-S can be utilized to estimate the required series injection voltage and the shunt compensating current profiles (magnitude and phase angle), and the overall VA loading both under voltage sag and swell conditions.The simulation studies demonstrate the effectiveness of the proposed concept of simultaneous voltage sag/swell and load reactive power sharing feature of series part of UPQC-S. The significant advantages of UPQC-S over general UPQC applications are:1) the multifunction ability of series inverter to compensate voltage variation (sag, swell, etc.) while supporting load reactive power; 2) better utilization of series inverter rating of UPQC; and 3) reduction in the shunt inverter rating due to the reactive power sharing by both the inverters.The UPQC apparatus is a good compensation system if wide installation of shunt units is needed. An increase in the percentage of the protected load enhances the voltage stabilization interval over which the UPQC can significantly improve the power quality.

Automatic Generation Control Schemes in Interconnected Power System: A Critical survey

Vol.1  No.2

Year: 2013

Issue: May-Jul

Title : Automatic Generation Control Schemes in Interconnected Power System: A Critical survey

Author Name : Gopi Pasala

Synopsis :

The load frequency control problem is non interactive mainly due to small load variations in power system. Maintaining power system frequency at constant value is very important for the health of the power generating equipment and the utilization equipment at the customer end. The job of automatic frequency regulation is achieved by governing systems of individual turbine-generators and Automatic Generation Control or Load frequency control system of the power system. The main objective of this paper is to present a critical literature review and aimed to highlight the various control and structural aspects of Automatic Generation Control used in multi area interconnected power system. Also this paper work reported in the Automatic Generation Control schemes based on power system models and control strategies are reviewed.

Remnant Life Estimation Of Power Transformers Using Fuzzy Logic

Vol.1  No.2

Year: 2013

Issue: May-Jul

Title : Remnant Life Estimation Of Power Transformers Using Fuzzy Logic

Author Name : Satyaprakash Ram, Ashwani Chandel

Synopsis :

Transformer failures in a power system very often lead to forced outages, blackouts and revenue losses. The power system can be run smoothly if the remnant life of the transformers is predicted accurately before such devices fail to perform. The remnant life estimation gives a flexible decision on replacement or relocation of power transformers. These devices are the connecting links between transmission and distribution end. The lifetime of the power transformer is mainly associated to the insulation system condition. In the present work experimental data obtained by conducting dissolve gas analysis, moisture content, breakdown voltage, interfacial tension, furan compounds and dielectric dissipation factor or tan delta on the various power transformers of Himachal State Electricity Board has been utilized to develop the proposed remnant life estimation model. The proposed Fuzzy logic model utilizes the MATLAB graphical user interface tool to interpret the life expectancy of the power transformers very accurately.

Hybrid Active Power Filter Design for 3-Phase, 4-wire System for Different Loads to Enhance Power Quality Using PSO

Vol.1  No.2

Year: 2013

Issue: May-Jul

Title : Hybrid Active Power Filter Design for 3-Phase, 4-wire System for Different Loads to Enhance Power Quality Using PSO

Author Name : praveena praveena, B.Suresh kumar , K.P. Krishna Prasad

Synopsis :

This paper proposes an optimal design method for an hybrid active power filters (HAPFs) set at high voltage levels to satisfy the requirements of Harmonic filtering, Power factor correction and reactive power compensation for Different Loads to Enhance Power Quality Using PSO [16]-[19]. Multi objective Optimization models for HAPF were constructed. Detuning effects and faults were also considered by constructing Constraints during the optimal process, which improved the reliability and practicability of the designed filters. Furthermore, the Particle swarm optimization algorithm was developed for searching an optimal solution of planning of filters.