Research On Key Technologies Of UAV-Assisted Wireless Communication Network For Transmission Line

Transmission line is one of the main parts of the power system,and its reliability and stability directly affect the overall operation of the power system.With the rapid development of China’s power industry,its coverage area continues to expand,and the demand for informatization and intelligence is also increasing.In order to meet the communication needs of the traditional ground base station in the blind spot area,a wireless communication method with flexible application and reliable performance is urgently needed to realize the data service transmission of the line.Unmanned Aerial Vehicle(UAV)has the advantages of high mobility and self-adaptive deployment.As a relay node,it can quickly establish a wireless link connection,which is suitable for transmission lines crossing mountain terrain and other scenarios.However,the data transmission and flight process of the UAV will generate continuous energy consumption,so that its life cycle will also have a certain degree of influence on the interruption probability of the communication link.How to reduce the energy consumption of the UAV and prolong the life cycle of the UAV on the basis of ensuring the reliability of the system has become one of the main challenges for the application of the UAV in the wireless communication network of the transmission line.Therefore,this thesis firstly considers the application of UAV in the wireless communication scenario of transmission lines for the problem of data transmission in blind spots in transmission lines.The path loss and small-scale fading loss of the airto-ground wireless transmission link,and the influence of the UAV own endurance on the interruption probability of the auxiliary transmission line monitoring system are studied.The system outage probability expression based on the life cycle of UAV is derived.The relationship between different UAV power allocation factors and their energy consumption,life cycle and system outage probability are analyzed.Secondly,under the condition that the total power of the system is constrained,the optimization problem of minimizing the outage probability is established,and the minimum outage probability under different total transmit power is obtained by genetic algorithm,and the proposed optimization scheme is compared with the traditional equal power allocation scheme.Simulation comparison analysis.The results show that the proposed optimization scheme outperforms the traditional scheme in terms of system outage probability performance.Finally,the thesis proposes a joint optimization algorithm of the total transmit power of the system and the position of the UAV,aiming at the change of the position of the sensor nodes in the transmission line.By allocating limited system resources,the total energy consumption of the UAV is minimized to improve its life cycle.Specifically,it is divided into an optimized power algorithm for given UAV position,the UAV position deployment optimization algorithm for given power allocation,and an iterative optimization algorithm that alternately optimizes these two problems.The power resource optimization and the optimal 3D space position deployment scheme of the UAV are obtained.The simulation results show that the proposed optimization scheme can significantly prolong the life cycle of the UAV and provide data transmission services for more sensor nodes compared with the given power and UAV position scheme.