A Multi-Optimization Design Method For Anti-Disaster Transmission Network

Frequent occurrences of different kinds of extreme weather and natural disasters in recent years have caused serious impact to the industry, agriculture and people's life. Inclement weather makes the probability of failure of transmission lines increased significantly, which brings serious threat to the safe operation of the transmission network. It will seriously affect the national economy and social order once a large area power outage occurs. In order to reduce the influence of natural environment on the safe operation of power grid, power grid enterprises generally take preventive measures to improve the power grid construction standards at the planning stage. However, Chinese power supply and load showed reverse trend of the distribution, transmission network responsible for the optimizing resources allocation presents characteristics of long span, complicated regional and geographical conditions, significant difference of weather. If improve the power grid protection standards comprehensively without distinction, it is difficult to guarantee the economic, efficient and reasonable improvement of grid disaster resilience. Meanwhile, the deficiencies of traditional transmission network planning methods are slowly unfolded: For different parts of the distribution network we almost use the same method of fortification. When calculating the vulnerability index of transmission network, it fails to establish mathematical relationship between the meteorological disasters and the transmission line outage rate, the planning schemes are usually unable to determine the stability of the core transmission line that should be guaranteed in the event of meteorological disasters, which is contrary to the principles of economic reliability and transmission network planning. Therefore, the construction of new anti-disaster power transmission network combined with Chinese national power grid characteristics and development situation has important practical significance.Therefore, in this paper, there proposes a multi-optimization design method for anti-disaster transmission network. It introduces differentiated in grid planning decision variables to optimize each transmission line for improving the disaster level, and builds the establishment of multi-objective network planning model taking into account the meteorological disasters factors. A three-state meteorological model is firstly developed to evaluate the effect of meteorological disasters on transmission line outage rate, then a multi-objective transmission network planning model is built considering economy and vulnerability objectives. This paper presents a method for solving multi-objective genetic algorithms and Monte Carlo simulation. Thus precising each transmission line disaster degree of protection can effectively determine the fortification standard level of each transmission line for improving the anti-disaster ability and minimize the construction cost as much as possible. It's of great value in the economy and practicality transmission of the transmission grid in the meteorological disaster.