الفهرس | Only 14 pages are availabe for public view |
Abstract With the advent of interconnection of large electric power system. many new dynamic power system problems have emerged. These problems include, (for example) the low frequency oscillation of power system, the sub-synchronous torsional oscillation of turbines in a steam plant of a capacitor compensated lines, etc. The design of supplementary controllers for low frequency oscillation, currently known as power system stabilizers (PSS): the excitation system stabilizer (ESS), and the governor system stabilizer (GSS), is involved to enhance the dynamic performance of power systems. The aim of this study is to investigate the dynamic performance of an industrial power system, Abu-zaabal Fertilizers and Chemicals Company power station when interconnected with the Egyptian Unified Grid (EUG), based on a new stabilizer design procedure. The station consists of a 7.5 MVA, 6.3 k~ turbo-generator, two interconnected power cable 2 kM long, 240 mmcross section and a substation of 11/6.3 kV, 10.5 MVA capacity. The factory consists of an induction motor load of 1.6 MW. 6.3 kV in addition to an auxiliary load of 0.6 MW, 0.4 kV (meduirn and small motors, lighting, and some heaters). An optimal multi-channel stabilizer is designed. The procedure of multi-channel stabilizer design is based on the minimization of a given quadratic performance index. Various input signals are used in this stabilizer which use local measurements to drive the feedback stabilizing signal to generator exciter and speed governor. Moreover, the load dynamics may have a significant influence on the system overall dynamic performance. Therefore. the effect of load dynamics on the design of the PSS ill general and on the system performance in particular is also investigated. Eigen-value analysis and time domain response are used to evaluate the performance of designed stabilizers. The simulation results show that the multi-channel stabilizer has a significant contribution from the point of view of the system dynamics. In addition, for the system given operating conditions, the dynamic load has a significant influence on the design of conventional power system stabilizers. |