Study About Intelligent Decision-making Technology Of Power Grid Melting-ice Based On Emergency Plan

The electrical power system emergency plan against snow and ice disasters is the basis of implementing emergency handling actions when electrical a power system suffers the snow and ice disaster weather. In the emergency handling of power grid melting-ice, the job of anti-icing disaster is hindered by some questions including the knowledge-system non-integrity of the melting-ice emergency plan, the low efficiency of the plan implementation and so on. With development of the power grid scale, the decision-making question, which the anti-icing disaster work faces, is arduous day after day, and the research and application of intelligent decision-making technology about power grid melting-ice will be helpful to solve these questions to a great extent. This thesis supplements "The Emergency Plan of snow and ice Disaster" and studies a series of decision-making problems in a complete melting-ice process. The supplement plan is symbolized and digitized on the basis of grading power grid ice-situation and formulating the corresponding standard. The rule in the supplement plan is handled by the method of eliminating conflicts and fusion and represented by a group of rules that can be distinguished by the computer through combining the two value method to complete the design of melting-ice intelligent decision-making system. Then, the thesis studies the decision-making model of the transmission line melting-ice, considering three main factors that influent the power grid melting-ice sequence: the ice cladding situation, power grid topology and the particularity of lines, build a decision model of power grid melting-ice sequence using the scoring model. The 220kV transmission line's melting-ice sequence in Hunan power grid is used as an example to demonstrates the practicality and feasibility of the built model. After that, a simulation model is built to compute melting-ice current in the Matlab platform and the melting-ice time is computed by programming on VFP. The melting-ice experiment on the Loudi 220kV substation confirms its computation accuracy. Finally, the problems to optimize the melting-ice equipment installment and the limit of the melting-ice line number at the same time in the same region are investigated. Through using the stationing optimization principle and method, it is determined that the Hunan power grid need to install 26 sets of melting-ice equipment from 2009 to 2015, and the maximum number of melting-ice lines at the same time in the same region at different stages of ice cladding situation is determined.