Effect of Transient Surge on Electronic Instrument and system with different Suppressing Techniques

Vol. 2  Issue 2
Year: 2014
Issue:May-Jul
Title:Effect of Transient Surge on Electronic Instrument and system with different Suppressing Techniques
Author Name:Alok Kumar Katiyar and Sheikh Rafik Manihar Ahmed
Synopsis:

This paper explains the effect of impulse transient surge on Control and Monitoring Electronic Instrument (CMEI) System with different suppressing technique, which has been installed in the areas where lightning and thunderstorm, occurs more frequently and under particular meteorological conditions. This Surge Protection Equipment (SPE) should be tested and replaced periodically. Lightning is nothing but a dispersion of an electrical charge between two different charge regions within the cloud flash or between a negatively charged region and ground flash. This earth flash can create problems in Control and Monitoring Electronic Instrument (CMEI) System. Suppressing technique is used not only to protect the physical hardware of electronic instrument, But also to ensure continued process control and measurement. Most process control, indication, monitoring and measuring electronic instrument ordinations are interconnected by signal and power cables, which run in ducting, on cable trays or buried under the ground [5]. Direct Lightning discharge, Electrostatic or Electromagnetic Induction Surge, and Lightning Surge caused by Ground Potential Rise (GPR) generates impulse transient voltage that propagates through the plant electrical power distribution via power cables [1], which couples with data flow signal cables and gets transmitted to electronic instrument. Impulse Transient Voltage (surge or Spikes) are sudden changes in current or voltage that occurs over a short period of time, which can damage the field transmitters, controlling and monitoring devices located in remote locations, or Computer terminals containing low-power semiconductor electronic devices due to over voltage as a result of rise in ground potential. Long distance installed Instruments like controlling or monitoring devices located in remote locations suffer from High impulse transient voltage and consequently component failure while short distance field mounted instruments (such as field transmitter) suffers significant damage.

Modelling and Simulation of a PMSM Motor Using Solar Panel

Vol. 2  Issue 1
Year: 2014
Issue:Feb-Apr
Title:Modelling and Simulation of a PMSM Motor Using Solar Panel
Author Name:Aravindaraj. K and Kovendan.E
Synopsis:

Permanent Magnet Synchronous Motor (PMSM) drives have been increasingly applied in a variety of industrial applications which require fast dynamic response and accurate control over wide speed ranges. However, there still exist challenges to design position-sensor less vector control of PMSM operating in a wide speed range, which covers both constant-torque and constant-power region. Field oriented control (FOC) of permanent magnet synchronous motor (PMSM) is one of the widely used methods for the speed control of the motor. The feasibility and effectiveness of various pulse width modulation techniques implemented for PMSM are addressed in this paper and verified by computer simulation. The whole drive system is simulated in MATLAB/SIMULINK based on the mathematical model of the system devices including PMSM and inverter. By using solar panel, the dc voltage is applied to a PWM inverter. The aim of the drive system is to have speed control by using solar panel. Simulation results show that the speed controller has a good dynamic response.

Performance Evaluation of Distribution System Using Shunt Capacitor, SVC and STATCOM

Vol. 2  Issue 1
Year: 2014
Issue:Feb-Apr
Title:Performance Evaluation of Distribution System Using Shunt Capacitor, SVC and STATCOM
Author Name:Shekhappa G. Ankaliki,Rashmi Kannur,Shridevi Narasannavar and Arathi Sunkara
Synopsis:

This article presents performance evaluation of real time radial distribution system with different compensating devices. The performance of real time radial distribution system was investigated using real time distribution system data with different compensating devices for different operating conditions. The performance evaluation of distribution system is analyzed by placing shunt capacitor, SVC and STATCOM independently; voltage profile and total losses are compared under different system operating conditions. To demonstrate the effectiveness of the proposed method, a 110/11KV distribution substation is selected for analyzing the performance and results are presented.

Control of DC link voltage in an OWC based WEC system for standalone application

Vol. 2  Issue 1
Year: 2014
Issue:Feb-Apr
Title:Control of DC link voltage in an OWC based WEC system for standalone application
Author Name:Vinatha U and Santosh B 
Synopsis:

Due to dwindling of fossil fuels and other non renewable energy resources, there has been a considerable advancement in field of renewable energy resources. Renewable energy provides a more stable source of power which is constantly replenished and infinite. The power obtained from the renewable sources depends on the geographical conditions which are varying, hence results in variable power generation. Power electronic converters play a very important role in obtaining a constant power from the renewable resources. In this paper studies on Oscillating Water Column (OWC) based Wave Energy Conversion System (WECS) has been carried out. The work involves the modeling of system, control of the dc and ac voltage for standalone application. The controllers are designed to regulate the voltage and address certain power quality issues.

Load Frequency Control Of Two Area Power System in Deregulated Environment Using Pi Controller

Vol. 2  Issue 1
Year: 2014
Issue:Feb-Apr
Title:Load Frequency Control Of Two Area Power System in Deregulated Environment Using Pi Controller
Author Name:Ajitha Priyadarsini.S and P.Melba Mary 
Synopsis:

In this paper load frequency control (LFC) of two area power system in deregulated environment using PI controller was studied. A two area system is considered in which all areas are interconnected by normal AC tie-lines. In each area there are two GENCOs and two DISCOs. DISCOs can buy power from GENCOs in their own area or from other areas. In the proposed system the effects of bilateral contracts between DISCOs and GENCOs are also considered. The performance of the PI controller is tested on a deregulated two area load frequency control system for different operating conditions using MATLAB Simulink tool. The results show that performance of PI controller is effective in reducing steady state error.

Power Quality Improvement in a Grid Connected Single Stage PV Generating System by integrating Shunt Active Filter for both connection of PV cells and power Quality Improvement

Vol. 2  Issue 1
Year: 2014
Issue:Feb-Apr
Title:Power Quality Improvement in a Grid Connected Single Stage PV Generating System by integrating Shunt Active Filter for both connection of PV cells and power Quality Improvement
Author Name:P. V. Ramkumar and M. Surya Kalavathi
Synopsis:

This paper presents a method of integrating Active Power Filter (APF) in Photo Voltaic(PV) system. Distributed Generation (DG) concept is attracting the attention of power sector engineers throughout the world due to its technical, economical and environmental benefits. Among the various possibilities of DGs, photovoltaic (PV) systems have drawn prominent attention In spite of their high cost and poor conversion efficiency. Power quality issues such as harmonics, are inevitable in such distribution system which must be sorted out. Separate Passive/Active Filters can be used for this purpose. However single VSI Converter can be made used for processing and connecting PV energy to system as well as for power Quality improvement of the whole system. This reduces the complexity and cost of the system significantly. The proposed PV System with single converter acting as APF is not only able to track the maximum power point of the photovoltaic energy but also compensate harmonic currents from the grid line and correct the power factor. Peak detection method of control strategy is employed in APF for power quality improvement. P&O algorithm is used for achieving Maximum Power Point Tracking of the PV generator. The proposed system of APF embedded in PV system is simulated using MATLAB/SIMULINK and tested for power quality improvement under the maximum Power Point Tracking of PV generator.

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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