Research of Power Allocation Algorithm in the Distribution Side of Smart Grid Based on 5G Non Othogonal Multiple Access System

5G communication technology has the advantages of large bandwidth, low delay, high reliability and service-oriented network architecture, which is a new wireless technology to solve the communication needs of smart grid. In order to solve the power allocation problem among smart grid services, this paper proposes a user grouping and power allocation algorithm based on non-orthogonal multiple access (NOMA) system. Firstly, the users of the base station are grouped, and we think of several users as a cluster, the channel gain between the base station and the users is input, and several users corresponding to the maximum channel gain are divided into a cluster. Then allocates the power of the users in the cluster, and power distribution is carried out among the clusters. The power distribution within the cluster follows the criterion of maximum fairness, and the power distribution between the clusters adopts the idea of iteration. By constantly adjusting the maximum power value of the cluster and the minimum power value of the cluster, the optimal power distribution of the smart grid system can be obtained. MATLAB simulation results show that: under different conditions, the algorithm proposed in this paper makes the distribution result fairer, the user’s minimum rate is also improved compared with the algorithm proposed in other literatures.