Abstract:The first part of this paper presents the basic analyses carried out on Nigerian 330 kV electrical network with distributed generation (DG) penetration. The analyses include load flow, short circuit, transient stability, modal/eigenvalues calculation and harmonics. The proposed network is an expanded network of the present network incorporating wind, solar and small-hydro sources. The choice of some locations of distributed generation has been proposed by energy commission of Nigeria (ECN). The conventional sources and distributed generation were modeled using a calculation program called PowerFactory, written by digsilent. Short-circuit analysis is used in determining the expected maximum currents, while transients stability and modal analyses are considered during the planning, design and in determining the best economical operation for the proposed network. One common application of harmonic analysis is providing solution to series resonance problems. Also, they are very valuable for setting the proper protection devices to ensure the security of the system.
The study simu lated the behaviour of power system stabilizer (PSS) on automatic voltage regulator (A VR) and excitation system. It also developed an algorithm to investigate the transient and dynamic stability of the power systems. This was with a view to providing informat ion of damping rotor oscillations of synchronous generators. Three types of power systems were investigated: a single-machine-infinite-bus system with and without PSS, two generators connected to a load with various types of excitation controls and a mult imachine power system typified by Nigerian 330-kV electrical network. Tabu-search technique was used to tune the PSS-parameters for a single machine connected to an infinite bus operating at three different loading conditions. The objective function allowed the selection of the stabilizer parameters to optimally place the closed-loop eigenvalues in the left-hand side of a vertical line in the complex s-plane. The effectiveness of this suggested technique was confirmed through eigenvalue analysis. Time-do main simulat ions were also carried out on two generators connected to a load using MATLAB/Simu lin k. Two types of PSS were used for these simulat ions: generic and mult iband. The power systems were subjected to a balanced three-phase fault (most severe fault). The investigation was further extended to Nigerian 330-kV electrical network.
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