Role of Power Converters for DFIG based Wind Energy Conversion Systems

Vol. 2  Issue 3
Year: 2014
Issue:Aug-Oct
Title:Role of Power Converters for DFIG based Wind Energy Conversion Systems
Author Name:Venkatasubramanian. R and Raghavendiran. T. A
Synopsis:

This paper explains different converter topologies with different induction generators used for wind energy conversion system. In this focused area of renewable energy resources, wind energy conversion system is more popular than the other conversion systems. Four main types of induction generator used in wind energy conversion system (WECS) are Squirrel Cage Induction Generator (SCIG), Permanent Magnet Synchronous Generator (PMSG), Doubly Fed Induction Generator (DFIG), and Wound Field Synchronous Generator (WFSG). Presently, Doubly-Fed Induction Generator (DFIG) is widely employed in modern wind power industries. The maximum electrical power can be obtained in both wind speeds of above and below synchronous speed using DFIG. Also, it reduces the power rating of the converter. This paper mainly explains the study concepts of Power converter topologies used with Doubly Fed Induction Generator (DFIG) connected wind energy conversion system

Load Frequency Control of Multi Area Inter Connected Power System by Conventional and AI Based Controllers

Vol. 2  Issue 2
Year: 2014
Issue:May-Jul
Title:Load Frequency Control of Multi Area Inter Connected Power System by Conventional and AI Based Controllers
Author Name:Ch. Durga Prasad
Synopsis:

The main objective of load frequency control (LFC) is to minimize the deviations in frequency and tie line power due to different load disturbances. This paper presents load frequency control of multi area interconnected power system with three single area systems using conventional controllers and artificial intelligence(AI) based techniques – Fuzzy and Artificial Neural Networks. The advantage of AI based controllers is that it can handle the non linear ties and at the same time it is faster than other controllers. Studies are carried out with Fuzzy and Fuzzy PID and compared with conventional controllers and finally concluded that AI based controllers gives better performance. The techniques are implemented in MATLAB/SIMULINK.

Steady State Analysis of IEEE-6 Bus Power System Using Power World Simulator

Vol. 2  Issue 2
Year: 2014
Issue:May-Jul
Title:Steady State Analysis of IEEE-6 Bus Power System Using Power World Simulator
Author Name:Shekhappa G. Ankaliki,Shashikumar .R,Nagarathna. M.C and Priyanka Biradar
Synopsis:

This paper presents the steady state analysis of power system using Power World Simulator. Analysis gives information about system voltage, power flows and losses in the system at different loading conditions. Analysis will recommend suggestion for stable operation of the system. The analysis is demonstrated by considering a case study of IEEE 6 bus power system. The performance analysis of the change in voltage and reactive power at the load side and generator side is done using the Power World Simulator software package (Version 16GSO). The outcome of this work helps in steady state monitoring, expansion of existing power system and design of new power system

Analysis of Radial Distribution Systems FOR Voltage Profile Improvement and Voltage Stability with and without Distributed Generators at Optimal Locations

Vol. 2  Issue 2
Year: 2014
Issue:May-Jul
Title:Analysis of Radial Distribution Systems FOR Voltage Profile Improvement and Voltage Stability with and without Distributed Generators at Optimal Locations
Author Name:K. Mercy Rosalina and N. Prema Kumar 
Synopsis:

The distribution systems were normally passive and it is designed to operate with unidirectional power flow. With integration of DG, the distribution system becomes an active system and bidirectional power flows should now be incorporated in the network design and its operation criteria. Studies on impact of DG on power flow, line loss, voltage profile and voltage stability requires suitable tools. The main aim of this paper is to determine the optimal placement of distributed generators so that net power saving are maximized and hence improvement in the voltage profile is achieved and hence the voltage stability is improved. A sample case study has been presented on practical agricultural radial distribution system to know the impact and system support benefits of distributed generators with the help of methods developed in the earlier using MATLAB software.

Transmission Expansion Planning Using Bacterial Foraging Optimization Algorithm (BFOA)

Vol. 2  Issue 2
Year: 2014
Issue:May-Jul
Title:Transmission Expansion Planning Using Bacterial Foraging Optimization Algorithm (BFOA)
Author Name:G. Srinivasulu,B. Subramanyam and M. Surya Kalavathi 
Synopsis:

Power Infra structure plays a vital role in the economic and social development of a country. Economic growth in India has spurred the need for more power and hence the infrastructure to transport the power. Adequate transmission capacity is very essential in any long-term planning for improving the availability and supply of power. So Transmission Expansion Planning is integral to the development of a stable and reliable power infrastructure. Planning for transmission lines in to the future is a very complex task which needs a coordinated and analytical analysis of various scenarios and contingencies. In this work we have implemented a scheme for Transmission Expansion Planning (TEP) which factors load growth and considers N-1 contingency. The optimization of the expansion plan is done with the help of Back Ward Search (BS), Forward Search (FS), Hybrid Search (HS) and Genetic Algorithm (GA) and Bacterial Foraging Optimization (BFOA). The expansion plan is suggested for a 6 Bus-Roy Billinton Test System (RBTS). The plans suggested by different optimization algorithms are compared in terms of number of new lines, length of new lines and the total cost of expansion.

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.