Transient Stability Enhancement of a Power System Considering Integration of FACT Controllers Through Network Structural Characteristics Theory

Transient Stability Enhancement of a Power System Considering Integration of FACT Controllers Through Network Structural Characteristics Theory

Volume 6, Issue 1, Page No 968-981, 2021

Author’s Name: Akintunde Alayande1, Somefun A.O1, Tobiloba Somefun2,a), Ademola Ademola2, Claudius Awosope3, Obinna Okoyeigbo2, Olawale Popoola4

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1Department of Electrical and Electronics Engineering, University of Lagos, Akoka, Yaba, 220282, Nigeria
2Department of Electrical and Information Engineering, Covenant University, Ota, 112107, Nigeria
3Department of Electrical Engineering, Kanni Samab Consultants, Ilupeju, 100252, Nigeria
4Department of Electrical and Electronics Engineering, Tshwane University of Technology, Pretoria, 0008, South Africa

a)Author to whom correspondence should be addressed. E-mail: tobi.shomefun@covenantuniversity.edu.ng

Adv. Sci. Technol. Eng. Syst. J. 6(1), 968-981 (2021); a  DOI: 10.25046/aj0601107

Keywords: Network structural characteristics theory, FACTS devices, Transient stability, Eigenvalue, Swing equation

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Modern power systems are topologically and structurally complicated due to their complex interconnections. Consequently, the complexity of the dynamic stability assessment be-comes more tedious, most especially, when considering a power electronics-based power system operating under faulty conditions. This paper, therefore suggests an alternative approach of Network Structural-Based Technique (NSBT) for the analysis and enhancement of transient stability of a power system considering Flexible Alternating Current Transmission Systems (FACTS) devices integration. The mathematical formulations based on the NSBT as well as the dynamic swing equations, required for carrying out the stability analysis, are presented. The structural characteristics of the network are captured by considering the interconnections of the network elements and the impedances between them. The eigenvalue analysis is then explored to identify suitable and possibly weak load node locations where the influence of FACTS device placement within the network, could be most beneficial. The transient stability analysis before and after critical outage conditions is investigated. The transient stability of the network operating under critical outage condition is then enhanced considering the integration of a multi- UPFC controller, which is suitably located as identified by NSBT. The effectiveness of the suggested approach is tested using the modified standard IEEE 5-bus, 30-bus networks as well as the practical Nigerian 28-bus grid incorporating a multi-FACTs controller. The results obtained show that the FACTS device contributes significantly to improving the transient stability of a multi-FACTS-based power network. The information provided by this study is highly beneficial to the system operators, utilities investors and power engineers, most especially, for predicting system collapse during critical outage conditions.

Received: 18 September 2020, Accepted: 21 December 2020, Published Online: 16 February 2021

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