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Electrical and Electronic Engineering
International Journal of Electrical Engineering and Technology (IJEET)
Editor in chief:Dr. S. Balasubramanian
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Wider Range Of Tuning The Proposed Vsc-Hvdc System For Improved Controller Performance
Author:Mr. James Muriuki,Dr. Christopher Muriithi,Prof. Livingstone Ngoo,Prof. George Nyakoe.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-17
Tuning of the Voltage Source Converters, High Voltage Direct Current (VSC-HVDC) controllers is a critical undertaking continuously carried out in power system operation to ensure system stability is kept under control while making maximum utilization of the plant output. The transfer functions for the controllers are mathematically derived using the control loops and properly tuned using the modulus optimum criterion (MOC) and the symmetrical optimum criterion (SOC) for improved controller performance. In this study, tuning of the controllers is carried out through the act of balancing the system response and its stability by selecting the proportional gain and time constant carefully based on the desired application. The vector control is utilized in this work due to its inherent ability to independently control active and reactive power between the converters and the grid. The stability of a power system relies on the symmetrical distance (a) selected. Previous researches advocated for VSC-HVDC control system to have the symmetrical distance selected between 2 and 4 respectively when using the SOC and the MOC tuning techniques respectively. However, the theoretical analysis and simulation results in this paper shows that for quick system response time and stability, the value of 'a' is selected as 8 when tuning the inner current controller by MOC and a=2 while tuning the DC voltage regulator with SOC. The model developed is implemented in DigSilent Power Factory and the results indicate that with proper tuning of the proposed controllers and based on the method of tuning, some good performance improvement in the controllability of DC voltage, active and reactive power is achievable.
Implementation Of Improved Environmental Adaption Method (Ieam) For Economic Load Dispatch Problem Of Thermal Generation Units
Author:Youssef Nagem Amhamad And Jyoti Shrivastava.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-8
This paper deals with the problem of economic load dispatch (ELD) in thermal generating unit. The function of the on-line economic load dispatch is to distribute the load among the generating units actually paralleled with the system in such a manner as to reduce the total cost of supplying the minute to minute requirement of the system. To reduce the running charges of the electric energy i.e. reduce the fuel consumption for meeting a particular load demand. The main factor controlling the most desirable load allocation between various generating units is the total running cost. The operating cost of a thermal plant is mainly the cost of the fuel so Improved Environmental Adaption Method (IEAM) is proposed for the optimal schedule of all the generator units that can supply the required load demand at minimum fuel cost while satisfying all system constraints such as Generator constraints and Transmission losses. New Bio- inspired Optimization Algorithm Improved Environmental Adaption Method (IEAM) is applied to solve economic load dispatch problem of IEEE six thermal generation units system. All results obtained through MATLAB Simulink software. The results show that the proposed method was indeed capable of obtaining higher quality solutions efficiently for ELD problems within less computation time.
3-Phase Induction Motor Parameter Monitoring And Analysis Using Labview
Author:Khichada Bhavin A,K.J. Chudashma,Vyas Darshan M,Shiyal Jignesh D.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-11
The objective of this paper is to design computer based reliable parameter monitoring and power quality analysis system of induction motor. In this paper monitoring of the current waveform, voltage waveform, harmonic distortion, amplitude and level analysis, FFT power spectrum and spectral analysis has been done using LabVIEW and NI 6008 DAQ card. The voltage and current are measured by current transformer and potential transformer for various loads, its output is interfaced with computer by NI 6008 DAQ card and displayed using LabVIEW software. The hardware implementation includes a setting up of a test system which includes current transformers, step down voltage transformers, DAQ card and 3-phase squirrel cage induction motor with variable supply voltage by 3-phase variable auto transformer.
Analysis Of Pi Controller'S Manual Tuning Technique For Residential Loads Powered By Solar Photovoltaic Arrays
Author:Swapnil Shende, Sankalp Pund, Pratik Suryawanshi, Shubhankar Potdar.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-6
The Paper analyses the use of a single phase inverter for remote residential loads powered by solar photovoltaic arrays for meeting household energy requirements. The study also describes the importance and role of PI controller in the proposed model for stand-alone systems to mitigate the effect of the variations by manual tuning of the controller. The paper discusses the behaviour of the tuned controller and the outcome such tuning.
Effect Of Steel Lamination On Core Losses In Switched Reluctance Motors
Author:J. Kartigeyan And M. Ramaswamy.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-11
The paper orients to investigate the influence of the steel lamination on the occurrence of the core losses in a three phase switched reluctance motor (SRM). The study attempts to compare the core losses in terms of its magnitude for the different types of core laminations on the motor with the same structure, operating under the same conditions. The effort involves the use of 2D finiteelement method (FEM) to obtain the core loss characteristics for a range of lamination thickness. The method allows a dynamic simulation procedure to evaluate the extent of loss reduction and suggest the choice of the appropriate size of the lamination for high speed applications.
Unified Power Quality Conditioner In Distribution System For Enhancing Power Quality
Author:A.S. N. Anjali Devi,G. Madhavi.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-9
Power quality is one of the major problems in the today's scenario. The distribution system, have numerous nonlinear loads, which severely affect the quality of power supplies. The Unified Power Quality Conditioner (UPQC) is a facts device that is used in the distribution system to mitigate the disturbances that affect the performance of sensitive and/or critical loads. It is the only versatile device which can mitigate several power quality problems related with voltage and current both. Therefore UPQC is a multi functioning device that compensates various voltage disturbances of the power supply, reduce the voltage fluctuations and prevent the harmonic load current from entering into the power system. To reduce the power quality problems in distribution system a dynamic model of UPQC is developed in MATLAB/SIMULINK with a combination of linear and non-linear loads.
Online Monitoring And Analysis Of Induction Motor Using Current Signature Analysis Implementing Wavelet Analysis And Fft Analysis
Author:N. Hariharavarshan, Jeyaram Durga Manian And R. Melvinaminny.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-19
Three phase squirrel cage induction motors are widely used in industrial applications.Thus fault occurring in these motors will adversely affect the Industrial products and increase the shut down time. As time moves, the machine develops major faults and disturbs the production line leading to major financial losses and production instability. In order to overcome these losses at critical circumstances, the fault could be found out prior to it rather than becoming into a major fault. Condition Monitoring System helps in predicting and identifying the pre fault condition in faster and effective way, which prevents the unwanted breakdown timein working hours. Among the various Condition Monitoring Systems such as thermal monitoring, vibration monitoring and so on ,Motor Current Signature Analysis (MCSA) is the best possible solution.As among all the available solutions are intrusive in operation (need shutdown period for testing), maintenance of the measuring equipment, bulk initial capital required, very high sensitivity and unreliable source with even small unsuitable environmental factors, slower in fault detection .All the undesirable factors of the other methods made MCSA an undisputable, viable, feasible ,reliable and best solution for fault detection mechanism to be followed in even small scale industries. They are being followed in many places often due to it'snon-intrusive approach to detect the fault, in addition a fast identifying method using FFT analysis .Normally MCSA are performed with FFT analysis which is effective in cases of constant load but as of today it is being an emergent problem to find fault in changing and fluctuating load conditions, where FFT fails its viability and this condition made the solution to choose wavelet analysis. In this paper, we have designed a complete3 phase induction motor with matlab toolsand induced faults into the motor externally (by varying the input frequency) and analysed the problem by using wavelet analysis. By analyzing the frequency spectrums of the stator current, electrical torque and angular speed, we were able to determine the total harmonic distortion for different faults and it will be produces clear explanation about the fault that is being introduced into the machine which will finally pollute the power system by injecting harmful harmonics into it.This method helps in envisioning the fault and thus helps in reducing the occurrence of severe faults (Brinelling, Arcing, Rotor Failure etc.) in the motor. Thus it acts as an important tool to protect machines from falling into unrepairable form. The MCSA model takes the initial step in improving the efficiency of the system and the technique utilizes the result of spectral analysis of stator current, torque and speed characteristics of the motor model.
Comparative Assessment Of Abnormal Voltage Stresses In An Isolated Mutually Coupled Transformer Model Winding With And Without Varistor
Author:Javid Akhtar,Dr. Mohd. Zahed Ahmed Ansari.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-11
The dynamic performance of high voltage power transformer (HVPT) windings owing to the impact of high voltage surges has evoked the attention of insulation engineers for almost a century. As these very fast rising transient over voltages generate huge peak voltage stresses along the windings and may perhaps threaten its insulation. Accordingly a profound understanding of this is crucial for insulation engineers to design the winding insulation optimally and thinking of novel protective devices to be used to ensure that insulation failure does not take place when such high voltage surges strike the terminals of HVPT's. In this paper, a HVPT winding is being represented by an isolated single phase 12 coil section and 18 coil section mutually coupled model winding and shunted with metal oxide varistors to suppress the huge peak voltage stresses and their complex oscillations occurring due to these extremely fast rising lightning surges. A simple electrical model of a Zno varistor is presented and its excellent properties are being utilized for the transformer winding insulation protection against such fast rising lightning surges. Simulation studies have been conducted for comparative assessment of abnormal voltage stresses in an isolated mutually coupled transformer model winding energized with full a periodical and chopped a periodical lightning surge voltages without and with varistor for a distribution winding constant α=10.
Advanced Multifunction Charge Control Module
Author:Bindu S. J,Sofiya A,Divyamol K . C.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-14
Defining a multifunctional charger, capable of undertake various operation in a single charger system. The charger system describing here is a combinational form of On board charger with a low voltage dc to dc converter system. The circuit design consists of mainly three H-bridges and a high frequency transformer with a switch to perform the three functions as a charger. The Hbridges form two converter sets- Front end full bridge converter and back end full end converter which will act according to the action to perform. Proper isolation is made between the grid and propulsion battery with the transformer. Front end full bridge converter will make power factor correction and rectify input. The charging of auxiliary battery will also be done by front end converter set by step down. Back end full bridge converter will charges the propulsion battery from grid & also discharges the propulsion battery to charge the auxiliary battery connected to the charging system. The performance of the system is simulated using the MATLAB simulation.
Design And Fabrication Of Solar Boat
Author:Edwina G. Rodrigues,Bindu S. J,Viji Chandran.
Volume: 7 | Issue no: 6-2016 | Pagination: 1-10
The design and initial testing of a solar powered fishing boat are presented. The concept vessel is a 4.2-m length overall (LOA) mono hull keel boat powered by an efficient DC-DC interleaved boost converter. The effective utilization of solar insolation is ensured by using MPPT. The paper will also discuss the details about the ship shape design, propulsion system, electrical section design etc., taking in account of minimum weight of the boat and minimum price of fabrication. The boat is designed to meet the requirements of fishermen in the backwaters.
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