Power System Security Assessment and Enhancement using Static Var Compensator
Authors: Amoo, A.Y., Adebisi, O.I., Amusa, K.A., Ogunsola, O.J.
DOI Info: http://doi.org/10.5281/zenodo.12599644
ABSTRACT
Security of power system (SoPS) describes its compliance with the pre-defined operational limits when exposed to disturbances. This study analysed the SoPS of the Nigerian 30 bus Electricity grid and enhancement was done via static var compensator (SVC) application. The steady state response of power system was modelled with Newton-Raphson load flow equations. The system response was simulated in an electrical transient analyzer program (ETAP) environment, considering a test case of the Nigerian 30-bus power grid. The bus voltage magnitudes and line loadings were determined to examine their adherence to the specified limits. The N-1 contingency evaluation was carried out on all possible outage elements of the considered network without and with enhancement and the severity index (SI) was determined. The base case load flow analysis revealed six cases of bus voltage limit violations and two cases of branch overloads. Contingency analysis ranked Benin-Onitsha and Ikeja West-Aiyede as the most and least critical branches with SI of 80.75 and 3.56 respectively. Multi-SVC installation on the system with line improvement on the overloaded branches mitigated all the bus voltage limit violations and line overloads. Contingency analysis performed after enhancement produced an appreciable reduction in the SI of the outage elements compared to the no enhancement case. This study established that hybrid use of SVC and line expansion was a better power system security enhancement approach than an SVC deployed singly.
Affiliations: Department of Electrical and Electronics Engineering, Federal University of Agriculture, Abeokuta, Ogun State, Nigeria.
Keywords: Bus Voltage Violation, Contingency, Line Loading Violation, Newton-Raphson Load Flow, Power System Security, Severity Index
Published date: 2024/06/30
