Voltage Stability Investigation of the Nigeria 330KV Interconnected Grid System Using Eigenvalues Method

摘要

Voltage stability investigation of the Nigeria 330kV grid Power Network was carried out using Eigenvalues method. The power system Jacobian matrix was derived using Newton -Raphson power flow solution iterative method to determine the eigenvalues for the voltage stability evaluation of both the existing 28-bus and improved 52 -bus Nigeria 330kV power networks. Positive and negative eigenvalues quantifying the power system vo ltage stability were identified. For a steady state power system, positive and negative eigenvalues showed stable and unstable systems respectively. The eigenvalues voltage stability method was developed, formulated and implemented on the existing 28-bus and proposed improved 52 -bus Nigeria 330kV power networks. The various eigenvalues, eigenvectors, participation factors and weak buses contributing to system voltage instability were determined using Matlab/SIMULINK Power System Analysis Toolbox (PSAT) for these power networks.