Seismic Reliability Analysis And Vulnerability Assessment Of Electric Power System

The electric power system is an important part of lifeline systems of Modern society. It plays an important role in the national economy. Whether it can work normally is directly related to the conduct of people’s life and the development of social economy. With economic development, the electric power system gradually toward the development of large-scale and high pressure. The coverage of the electric power system is increasing and the structure of it is more and more complex, and the system contains a large number of high voltage electrical equipments with high seismic vulnerability. These features lead to the electric power system can easily be suffered in the earthquake destruction. In the previous earthquake damage, the electric power system have varying degrees of damage and some damage even lead to paralysis of the system。 This damage has caused huge losses to the national economy, and brought great difficulties to the earthquake relief work after the earthquake. Thus seismic reliability analysis and vulnerability assessment of electric power system is a significant subject for the lifeline engineering at the moment.In this paper, seismic reliability analysis and vulnerability assessment of electric power system are studied thoroughly. The main contents are as follows:1. This paper Introduces the research background of this paper, reviews the past results achieved by domestic and foreign scholars in the seismic reliability analysis of electric power system and make the outlook for the future development trend.2. Power system is a large and complex system. In order to facilitate its network analysis, we need to simplify geographical wiring diagrams into a network model consisting of nodes and links according to certain principles and the logical relationship between its parts.Some basic assumptions and ground motion parameter was added to the network model, based on which Seismic analysis model of electric power system is built.3. Introduce the calculation methods of seismic reliability for high voltage electrical equipments. Based on it, calculation methods of the seismic reliability of high-voltage substation and high-voltage power plants are given.4. Based on the seismic analysis of the node unit, The Monte Carlo method combined with the Warshall algorithm was applied to calculate seismic reliability of electric power system. This paper applies Monte Carlo method for stochastic simulation for electric power system in order to reproduce the destruction of each node unit of the system in the earthquake. For the shortcomings of past connectivity analysis algorithms, this paper proposes the use of Warshall algorithm instead of the previous algorithms to calculate the network connectivity matrix and compile the corresponding program. The algorithm combines computer storage techniques to solve the problem of node failure is applicable to connectivity and the reliability of the large and complex network systems. Example has proved that the algorithm is accurate and efficient.5. We make preliminary study in the electric power system’s vulnerability assessment. Two seismic vulnerability assessment models were made to assess the vulnerability of electric power system from different perspectives. Through examination and comparison of examples, we obtained satisfactory results and concludes:the nodes which is closed to source point and has a high degrees are more vulnerability in the earthquake destruction. Therefore, we need to strengthen the monitoring and maintenance of these nodes and take the appropriate seismic strengthening measures to improve the electric power system transmission capacity.