i-manager's Journal on Electrical Engineering (JEE)


Volume 5 Issue 4 April - June 2012

Research Paper

Design of Optimal Reduced Order Observer for Three- Area Load Frequency Control in a Deregulated Environment Interconnected with HVDC Link

T. Anilkumar* , N. Venkata ramana**
* Associate Professor, EEE Department, ACE Engineering College, Ghatkesar, Hyderabad, India.
** Professor and Head of Department, EEE Department, JNTU-Jagityal, KarimnagarDist ,India.
T. Anil Kumar and N. Venkataramana (2012). Design Of Optimal Reduced Order Observer For Three-Area Load Frequency Control In A Deregulated Environment Interconnected With HVDC Link. i-manager’s Journal on Electrical Engineering, 5(4), 1-10. https://doi.org/10.26634/jee.5.4.1856

Abstract

This paper presents a reduced order observer solve load frequency control problem in a three-area deregulated environment when interconnected with HVDC link. The performance of the proposed method is compared with optimal state feedback controller. This proposed control strategy can estimate measurable state variables as well as it gives good dynamic response as a controller.

Research Paper

Induction Machine Bearing Fault Diagnosis With Discrete Wavelet Transform Using Vibration Signal

Ashwani Kumar Chandel* , Raj Kumar Patel**
* Associate Professor, Department of Electrical and Electronics Engineering, National Institute of Technology, Hamirpur, HP India.
** M.Tech Student, Department of Electrical and Electronics Engineering, National Institute of Technology, Hamirpur (H.P.).
Ashwani Kumar Chandel and Raj Kumar Patel (2012). Induction Machine Bearing Fault Diagnosis With Discrete Wavelet Transform Using Vibration Signal. i-manager’s Journal on Electrical Engineering, 5(4), 11-17. https://doi.org/10.26634/jee.5.4.1858

Abstract

Condition monitoring and fault diagnosis of electrical machinery are of great concern in industries. Pre fault detection in machinery can save millions of rupee required as emergency maintenance cost. In the present paper a methodology for the diagnosis of bearing faults in an induction machine has been given. The proposed discrete wavelet transform methodology extracts principal features from vibration signals caused by the faulty bearings and subsequently analyse these for determining the type of fault. The discrete wavelet transform is fed with the accelerometer signals and it is found that the impulses appear periodically with time period corresponding to defect frequencies. The results thus obtained reveal that the proposed pre-faults detection method is very efficient and effective.

Research Paper

New Control Technique Applied in Dynamic Voltage Restorer for balanced and unbalanced Voltage Sag /swell

S. Deepa* , S. RajaPandian**
* Research Scholar, Sathyabama University, Chennai, India.
** Professor, Panimalar Engineering College, Chennai, India.
S. Deepa and S. RajaPandian (2012). New Control Technique Applied In Dynamic Voltage Restorer For Balanced And Unbalanced Voltage Sag /Swell. i-manager’s Journal on Electrical Engineering, 5(4), 18-22. https://doi.org/10.26634/jee.5.4.1862

Abstract

Dynamic Voltage Restorer (DVR) is a custom power device used in power distribution networks to protect consumers from sudden sags and swells in grid voltage. This paper discussed abc to dq0 base new control algorithm to generate the pulse. The proposed control scheme is simple to design and has excellent voltage compensation capabilities. Effectiveness of proposed technique is investigated through computer simulation by using MATLAB/SIMULNK software. The simulation results have shown validation of the control system.

Research Paper

Transmission Loss Allocation in Transaction Frame-work using Genetic Algorithm

S.V.N.L. Lalitha* , Maheswarapu Sydulu**
* Associate Professor, Electrical & Electronics Engineering Department, K L University, Vaddeswaram, Guntur District., Andhra Pradesh, India.
** Professor, Department of Electrical Engineering, National Institute of Technology, Warangal.
S.V.N.L. Lalitha and Maheswarapu Sydulu (2012). Transmission Loss Allocation In Transaction Framework Using Genetic Algorithm. i-manager’s Journal on Electrical Engineering, 5(4), 23-29. https://doi.org/10.26634/jee.5.4.1859

Abstract

Using a physical flow based approach, power injected at a bus can be expressed as a product of transaction amounts and transaction co-efficients for all buses except slack bus. Since the slack bus has to compensate for the system losses, transaction co-efficients corresponding to system slack bus include an additional component to account for the loss and thus necessitate the need to be calculated iteratively. This paper proposes a Zbus method for direct determination of the loss allocation among transactions provided the transaction co-efficients are known. An attempt is made to find the transaction co-efficients corresponding to slack bus using Genetic Algorithm (GA). Case study is performed on IEEE 24 bus RTS with multiple transactions and the test results are compared with the results of existing methods.

Research Paper

Modeling and study of a standalone PV system using MATLAB/SIMULINK

Mohammed Aslam Husain* , M. Faisal Jalil**, M. Tabish S Beg***, M. Naseem****, Abu Tariq*****
* Head of Department, Electrical Engineering Department, University polytechnic, Integral University Lucknow, India.
**-***-**** Department of Electrical Engineering, Aligarh Muslim University (AMU), Aligarh, India.
***** Associate Professor, Department of Electrical Engineering, Aligarh Muslim University (AMU), Aligarh, India.
Mohammed Aslam Husain, M. Faisal Jalil, M. Tabish S Beg, M. Naseem and Abu Tariq (2012). Modeling And Study Of A Standalone PV System Using MATLAB/SIMULINK. i-manager’s Journal on Electrical Engineering, 5(4), 30-35. https://doi.org/10.26634/jee.5.4.1863

Abstract

The paper presents the modeling of a standalone PV system in Matlab/Simulink environment. The PV model is developed using basic circuit equations of the photovoltaic (PV) solar cells including the effects of solar irradiation and temperature changes. A DC/DC buck converter is used to decrease the array voltage to that of battery and connected DC load. The buck converter is controlled to extract the maximum power output of PV panel. The equations of the model are presented in details. Firstly the mathematical modeling of a solar cell is done, then how a solar module, array and panel is obtained using that cell is shown clearly. Different characteristics of cell, module, and array have been obtained for different parameters. Secondly a standalone model of PV system in modeled and analyzed. Solar PV panel is a nonlinear power source that needs accurate identification of optimal operating point. It is desired to operate Solar Photo Voltaic (SPV) panel at its maximum power output for economic reasons. This paper is useful to model, simulate and study the effect of changing ambient conditions of a standalone PV system.

Research Paper

Suppression Of Very Fast Transient Over Voltages Across Insulating Flange Of UHV GIS

A. Raghu Ram* , Jinka Amarnath**, Kamakshaiah***
* Associate professor, Department of EEE J.N.T.U.H, Hyderabad.
**-*** Professor, Department of EEE, J.N.T.U.H, Hyderabad.
A. Raghu Ram, J. Amarnath and Kamakshaiah (2012). Suppression Of Very Fast Transient Over Voltages Across Insulating Flange Of UHV GIS. i-manager’s Journal on Electrical Engineering, 5(4), 36-42. https://doi.org/10.26634/jee.5.4.1861

Abstract

In gas insulated substations (GIS), very fast transient over voltages (VFTO) are generated due to disconnector switching operations, disconnector switches (DS) are primarily used to isolate the operating sectioning of HV insulation from each other as safety measure, vary fast transient over voltage(VFTO) at an insulating flange are generated due to propagation of VFTOs on the conductor of a gas bus in GIS. Generation of VFTOs cases sparkovers across the insulating flange of high pressure oil filled cable/GIS interface. The ionized path formed by spark over creates low impedance path for power frequency fault current due to disconnector switching, resulting in flange damaged with serious consequences. This paper deals the generation of VFTOs across the insulating flange and suppressions of VFTOs with shunting bars, capacitors across the flange for the providing potential have been analyzed and reported in MATLAB 7.0.

Research Paper

A New Improved Fuzzy Logic Based Power System Stabilizer

D. Sabapath* , R. Anita**
* Senior Assistant Professor, Department of Electrical and Electronics Engineering, M P Nachimuthu M Jaganathan Engineering College, Chennimalai, Erode
** Professor & Head, Department of Electrical and Electronics Engineering, Institute of Road and Transport Technology, Erode
D. Sabapathi and R. Anita (2012). A New Improved Fuzzy Logic Based Power System Stabilizer. i-manager’s Journal on Electrical Engineering, 5(4), 43-47. https://doi.org/10.26634/jee.5.4.1860

Abstract

Power System Stabilizer (PSS) is installed in the Automatic Voltage Regulator (AVR) of the generator, it must be capable of providing appropriate stabilization signals over a broad range of operating conditions and disturbances. Traditional PSS relay on robust linear design methods. In order to eliminate to cover a wide range of operating conditions, expert or rule based controllers have also been proposed. Fuzzy logic as a robust control design method has shown promising results. In this paper, a systematic approach to fuzzy logic control design is proposed.  This paper presents a study of Fuzzy Logic Power System Stabilizer (FLPSS) for stability enhancement of a two-area four-machine system. In order to accomplish the stability enhancement, speed deviation (??) and acceleration power deviation (?p) of the rotor synchronous generator have been taken as the inputs to the fuzzy logic controller. These variables show significant effects on damping the generator shaft mechanical oscillations. The stabilizing signals have been computed using fuzzy membership function depending on these variables. The performance of the system with FLPSS is compared with Conventional Power System Stabilizer (CPSS) and the system with PSS.

Research Paper

A Novel Power Control Scheme of Zero Headed Power Generation by SVPWM Technique

C.Y. Sriharsha* , K. Narasimha Raju**
* B.Tech Student, Department of Electrical & Electrical, KLCE, Vijayawada, India
** Assistant Professor, Department of Electrical & Electronics, KL CE, Vijayawada
C.Y. Sriharsha and K. Narasimha Raju (2012). A Novel Power Control Scheme Of Zero Headed Power Generation By SVPWM Technique. i-manager’s Journal on Electrical Engineering, 5(4), 48-54. https://doi.org/10.26634/jee.5.4.1857

Abstract

This paper presents an approach to the Power Regulatory Scheme for the Zero Headed Power Generation. In this scheme the system is mathematically modeled and is simulated in MATLAB. In Zero Headed Power Generation Scheme a Helical Turbine, which harnesses kinetic Energy of hydro Currents of water into Mechanical Energy, is used. The Mechanical Energy thus created is converted in to Electrical Energy by Synchronous Generator.  The mathematical equation for the Helical Turbine is obtained and the synchronous generator is mathematically modeled and the generator specifications regarding to 150KW are specified. The output power from the synchronous generator is regulated by control circuit with the help of SVPWM technique [1]. The controller is used for the variations in the flow rate of water. A closed loop control loop is designed to obtain standard voltage and standard frequency by PI Controller logic. The system has been simulated for with and without controller and the results are compared.