Umudike Journal of Engineering and Technology

Michael Okpara University of Agriculture, Umudike


GENERATOR TRANSIENT STABILITY ANALYSIS FOR IMPROVED SYSTEM PROTECTION

Onah, A. J.
Department of Electrical/Electronic Engineering Michael Okpara University of Agriculture, Umudike Abia State, Nigeria

Amako, E. A.
Department of Electrical/Electronic Engineering Michael Okpara University of Agriculture, Umudike Abia State, Nigeria

Obi, P. I.
Department of Electrical/Electronic Engineering Michael Okpara University of Agriculture, Umudike Abia State, Nigeria



ABSTRACT

Power system stability is a major concern in developing countries especially in Africa where power system security and integrity of operation is in jeopardy. Even the few healthy network, find it very difficult to manage power generation transient stability under fault conditions. However, the main problem is the ability to maintain the synchronous operation of the generator(s) in the network when increment in load is too large or applied too sudden. This paper is focused on investigating the influence of 3-phase fault, rotor angles and critical clearing time on generator transient stability. The materials used include data from Transcorp Power Limited, Delta State and MATLAB SIMULINK software for data analysis. First an adequate mathematical model of the synchronous generator was established, before presenting the solution of generator transient stability analysis under a three Phase fault, using equal area criterion method and Swing equations. Results obtained shows that a critical clearing time of 0.28 seconds at a rotor angle of 89.15 degrees for the generator to remain just stable, when the fault is near the sending-end of the line; if the fault is not cleared after this time the generator will lose synchronism. Also when the fault is at the center of the line, a critical clearing time of 0.35 seconds is required at an angle of 98.85 degrees for the generator to remain just stable. And when the fault is near the receiving-end of the line a critical clearing time of 0.445 seconds at a rotor angle of 110.47 degrees is required for the generator to remain just stable, if the fault is not cleared after this time the generator will lose synchronism and become unstable. The results of the simulations also indicate that the critical clearing time and critical clearing angle increases as the location of a fault moves down the transmission line, from δc = 89.116° and Tc = 0.239 secs at the sending end to δc= 110.553° and Tc = 0.279secs at the receiving end. Therefore, the Generator Transient Stability Model developed in this work can be used for effective planning and secured operation of the power system.


Keywords: Transient Stability, Synchronism, Critical Clearing Time, Rotor angle, Critical Clearing Angle, Faults


View: 27 | Download: 1

Conference Code
IECON2019

Conference Title
ENGINEERING FOR SUSTAINABLE ECONOMIC DIVERSIFICATION, FOOD AND NATIONAL SECURITY

ISBN
978-978-53175-8-9

Date Published
Friday, September 20, 2019

Conference Date
2nd - 4th September, 2019

The contents of the articles are the sole opinion of the author(s) and not of UJET.


Open Access
Umudike Journal of Engineering and Technology makes abstracts and full texts of all articles published freely available to everyone immediately after publication thereby enabling the accessibility of research articles by the global community without hindrance through the internet.

Indexing and Abstracting
We are index in Google Scholar