Research On Method Of Regional Query In Large-scale Smart Grid Transmission Line

As energy shortages are becoming increasingly serious, the traditional power grid transmission mode is hard to solve the imbalance of the distribution of our energy and the productive forces, thus, the development of smart grid has become an inevitable trend. Transmission lines is an important part of smart grid, and it is the artery of the power grid operation. Transmission lines are mostly uses the overhead line, perennial exposed, and it is also influenced by the environmental factors and the heavy weather, such as rain and snow and so on. Besides, it is easy to damage, malfunction and cause mutations. Sensor technology was applied to the smart grid transmission line monitoring system, in order to collect the real-time data and find the problems in time, which can ensure the security of transmission and improve power supply reliability. Therefore, in view of the large-scale smart grid transmission line efficient query is become a key problem in current study of the smart grid.In this paper, it studies the existing query technology for smart grid transmission line, and it finds that the existing query of the transmission line is mostly aiming at the global query of wireless sensor network, which cannot satisfy the flexible and efficient query requirements based on any area. This paper deeply analyses the network layout and query characteristics of the large-scale smart grid transmission lie monitoring system, and proposes a query method of regional query in large-scale smart grid transmission line. This method will be divided the large-scale smart grid transmission line into meshes, and all of the gathering node covered by substation build a logical shortest path tree within each mesh. Thus, the logical shortest path tree make each sensor node has the shortest hop to the root node, reduce data transmission consumption, and save the energy of the nodes; It can determine the meshes which involve in the query and the destination grids which collect the query results by comparing the maximum range of the mesh and query window. In the phase of issuing the query, it makes different issued strategies in the control center and the calculating IED node for different grid level. This paper use the nearest method to choose the related nodes within source meshes, and establishes a dynamic query routing tree which uses the related node as the root,which uses to collect the query results of the source mesh; It builds an optimized collect path by the merging strategies of the logical query tree and reduces the amount of data transmission in wireless sensor networks, improve the network life of the monitoring system.Through the relevant experiment verify the rationality of the regional query method in large-scale smart grid transmission line it proposed. The experimental results show that the method can not only quickly return the query results in the query window, but also reduce the communication cost, and save energy sensor nodes.