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.