Stability analysis for large power system interconnections (Tunisia-Libya)

Abstract

The interconnections between the national power systems was developed parallel to networks of each country. Originally, the interconnections used to get outside help in case of failure could affect the security of a country national electricity supply. In electrical power networks small oscillations appear from time to time. These oscillations concern the quantities determining the equilibrium point of the system, and following which, system stability and system behaviors are influenced. To improve system behaviors and dynamic stability it is necessary to minimize these transient states. The objective of our study is, first, to check the static stability of the high voltage power to small perturbations of electrical network. In this context, we present a study based on the modal analysis of the linearized system. The results of this analysis allow us to obtain the optimal placement of power regulators PSS injected at the input of voltage regulator AVR based on the matrix of participation. The calculation of these parameters is performed by the regulators method residues.In this paper, the study is structured around one main objective: to have a real interconnection Tunisia-Libya with a stable, efficient and solider operation.Keywords small oscillations, the static stability of Libyan electrical network, the stability of the Tunisian network interconnected with the one of Libya, PSS, AVR,the method of participation factors, method residues.

Tie-Line Bias Control Applicability to Load Frequency Control for Multi-Area Interconnected Power Systems of Complex Topology

“…As with the proof in Theorem 1, it boils down to verifying that rank(A 1 ) = m. It is easily proved that system frequency deviation ∆ f i is regulated back to zero, which is obtained in the same way as through summation of control equations in Equation (3). From the third equation in Equation (16), it is learned that tie-line interchange power deviation of the chosen unshared tie-line of the IR satisfies ∆P tie(i_j) = 0, which is equivalent to that the i(j) th row of A 1_2 , is a PIAR.…”

“…Interconnection of electrical power systems has been the main trend in modern power grid construction [1][2][3]. By interconnection, distributed power systems can assist each other in case of emergencies due to their varied load requirement and capacity outage [4].…”