Linear sensitivity factors are methods in sensitivity analysis, used in determining the effect of power system component variations on the remaining part of the system. This study presents the application of linear sensitivity factors for real time power system post contingency flow determination. The Power Transfer Distribution Factor (PTDF) was used to predict the proportion of power that will flow on a line after a transfer of power has occurred from one bus to another. The Line Outage Distribution Factor (LODF) was used to predict the proportion of power that will flow on a monitored line due to an outage of another power line. The study implemented the use of these sensitivity factors on a six bus sample case and the result from this showed that when there was a transfer of 50MW power from generator at bus 1 to bus 2, the line flow on line index 2 increased from 76.66MW to 92.41MW which is near the thermal limit of 100MVA, but in line index 2 there was an output reduction in flow from 50MW to 35MW on bus 2 generation. The study achieved its purpose of applying linear sensitivity factor to determine the real time power system post contingency flow with the help of MATPOWER which is an embedded program in MATLAB simulator. Similarly the result of the post outage line flow on line index 8 as a result of the outage of line index 6 was calculated using the LODF sensitivity factor to be 18.29MW while the pre outage flow was 12.54MW. These values tallied exactly with the value obtained using the conventional DC load flow calculation. Therefore the study ascertained that it is faster and more reliable to use these sensitivity factors to resolve power system load flow problems rather than going through the conventional load flow methods. The study also has been able to contribute to knowledge, by proposing a linear sensitivity analysis method that can relate to expected real time load value, in relation to component variations, as well as operating limit verification. Post-contingency ranking of power system network in order of their severity is one of the recommended areas of which this work could be applied.
Cognitive Power flow, Contingency, PTDF, LODF
Obi Obinna Kingsley , A. J. Ulasi , J. P. I. Iloh "Application Of Linear Sensitivity Factors For Real Time Power System Post Contingency Flow " Iconic Research And Engineering Journals Volume 2 Issue 11 2019 Page 46-61
Obi Obinna Kingsley , A. J. Ulasi , J. P. I. Iloh "Application Of Linear Sensitivity Factors For Real Time Power System Post Contingency Flow " Iconic Research And Engineering Journals, 2(11)