GIS-based Aseismic Function Study Of Urban Electric Power System

An urban electric power system is an important part of urban lifeline systems of modern society, and it is vulnerable during earthquake. In this thesis, the present development condition of study in the field is introduced in detail. The relative methods are used to analyze the seismic reliability of different levels of electric power system, which conclude high-voltage electric equipments, substations and the whole network. Then, seismic function states of the urban electric power system are worked out according to failure probability, also seismic economic losses are worked out, which include direct loss and indirect loss.In this field, the study of the seismic reliability of the high-voltage electric equipments has developed for many years and been mature, but the study of high voltage substation system and the high-voltage electric power network is developing initially. Based on some theory and GIS, some new methods are explored as follows:1. When the reliability of high-voltage substation is computed, configuration and buildings with parallel relationship are considered. The aseismic capability of configuration is computed according to its series-parallel connection law.2. Statistics of average failure probability of high-voltage equipments is calculated, which are based on data from historic earthquake or some results of national projects. It offers a good means in analyzing the reliability of high-voltage equipments.3. A new method is developed for evaluating the power system network, by which the failure probabilities of substations are worked out on the basis of the whole system.4. A model of electric power system function states is brought forward according to the failure probabilities, which considers damage of function and the restoration time etc, by which electric power system function failure states quantificationally are described.5. A model of seismic economic loss of electric power system is put forward and used in the thesis, which considers four kinds of losses: expenditure of equipments fixing and rebuilding, sell profit loss, stopping-reducing production loss and tax loss.6. The analysis of function failure is formulated within ArcGIS platform thatintegrates seismic influence zone model and seismic economic loss model etc. The ArcGIS platform is customized and becomes a special software to analyze the aseismic capability of urban electric power system, which can vividly display result.7. The thesis takes the urban electric power system of LongYan city in FuJian province as an example. The database including electric power network data and seismic data is set up, the analysis results are worked out in condition of a given earthquake, which includes the seismic reliability of five substations, the system and its influence zone function failure states and seismic economic loss.