ICGST-ACSE Journal, ISSN: Print 1687-4811,
Online 1687-482X & CD-ROM 1687-4838,
Volume (11), Issue (II), November
2011
| @ARTICLE |
{P1111128656, |
| AUTHOR = |
{K. Radha Rani and J. Amarnath and S. Kamakshaiah}, |
| TITLE = |
{Contingency Analysis under Deregulated Power Systems}, |
| JOURNAL = |
{ICGST International Journal on Automatic Control and Systems Engineering, ACSE}, |
| YEAR = |
{2011}, |
| MONTH= |
{November}, |
| VOLUME = |
{11}, |
| ISSUE = |
{II}, |
| PAGES= |
{1--8}, |
| ABSTRACT= |
{The electric power industry is in transition to a deregulated market place for power transactions. In deregulated environment, participants are interested in maximizing their own profits, regardless of the system-wide profits. It is perceived that the competition will reduce the price of electricity for retail customers; however, the key issue for participants is related with the price definition to remain competitive. Contingency Analysis of a power system is a major activity in power system planning and operation under deregulated environment. In general an outage of one transmission line or transformer may lead to over loads in other branches and/or sudden system voltage rise or drop . This paper focuses on developing an algorithm for Multiple Line Outage Distribution Factor (MLODF) and to take corrective actions based on sensitivity for multiple outages. The developed algorithm was tested on three test systems; six bus, thirty bus and thirty seven bus test cases. The test results demonstrate that given situational awareness the algorithm provide additional decision support that can be used for remedial actions and/or for recovery after multiple outages. Integrating these into a power system energy management system ( EMS ) will provide a tool for operators to have a better understanding of the system before and during an extreme condition}, |
| NOTE= |
{ Deregulation, Contingency Analysis, Multiple-line outages, power system control} }
|
| @ARTICLE |
{P1111130671, |
| AUTHOR = |
{V. Anantha Lakshmi and T. Brahmananda Reddy and V. C. Veera Reddy and M. Surya Kalavathi}, |
| TITLE = |
{Reduction of Common Mode Voltage using Space Vector Based PWM Techniques for Induction Motor Drives}, |
| JOURNAL = |
{ICGST International Journal on Automatic Control and Systems Engineering, ACSE}, |
| YEAR = |
{2011}, |
| MONTH= |
{November}, |
| VOLUME = |
{11}, |
| ISSUE = |
{II}, |
| PAGES= |
{9--15}, |
| ABSTRACT= |
{In conventional space vector pulse width modulation (CSVPWM), the complexity involved in calculation of sector and angle information is more. Moreover common mode voltage (CMV) is more due to usage of zero voltage vectors V o and V 7 . To reduce CMV and complexity involved in CSVPWM algorithm, this paper presents a simplified active zero state PWM algorithms (AZPWM) using the concept of imaginary switching times in which actual switching times are calculated from the sampled phase voltages. In the proposed approach, for the reduction of CMV instead of using zero voltage vectors two active opposite voltage vectors with equal time duration are utilized with two adjacent active voltage vectors to compose required reference voltage vector. Though these AZPWM methods reduce the computational burden involved in calculation, they still suffer from steady state ripples in torque, flux and current. To reduce the ripples in steady state, a hybrid PWM (HPWM) technique is developed in which stator flux ripple analysis is done for all the AZPWM sequences. To validate the proposed PWM algorithms, numerical simulation studies have been carried out v/f controlled induction motor drive using MATLAB-Simulink and results are presented and compared}, |
| NOTE= |
{imaginary switching times, induction motor drives, PWM inverter, SVPWM,CMV variations} }
|
(Status: Accepted Full Paper)
| @ARTICLE |
{P1111133709, |
| AUTHOR = |
{J. Sridevi and J. Amarnath and G. Govinda Rao}, |
| TITLE = |
{Influence of FACTS Devices on Congestion Management in Deregulated Power System}, |
| JOURNAL = |
{ICGST International Journal on Automatic Control and Systems Engineering, ACSE}, |
| YEAR = |
{2011}, |
| MONTH= |
{November}, |
| VOLUME = |
{11}, |
| ISSUE = |
{II}, |
| PAGES= |
{17--24}, |
| ABSTRACT= |
{Deregulation of electric industry has a direct impact on the increasing number of transactions. This lowers the available margin and leads to the increased congestion of transmission lines. Thus the system becomes more vulnerable to collapse. Analyzing the system security and congestion, and determining their effects on pricing becomes more important than ever in the deregulated environment. This paper proposes a method for the placement of Flexible AC Transmission System devices in deregulated power system to reduce congestion. Locational marginal price is used to study the effect of congestion in the pricing model. The proposed method is based on Locational Marginal Price differences of Optimal Power Flow to find the optimal location of Thyristor Controlled Series Capacitor (TCSC) and Thyristor Controlled Phase Angle Regulator (TCPAR) devices. The overall objective function can be either to minimize the congestion rent or to maximize the social welfare. The proposed method is tested on an IEEE 24rts system, an IEEE 57 bus system and an IEEE 118 bus system. Results shows that the proposed method for TCSC is capable for reducing the congestion rent and for TCPAR is capable for maximizing the social welfare}, |
| NOTE= |
{Congestion, OPF, TCSC, TCPAR, LMP} }
|
(Status: Accepted Full Paper)
|
