In order to improve the connection rate and transmission efficiency of field network for power distribution grid, a dual-mode heterogeneous field network with high-speed power line broadband carrier and micro-power radio frequency wireless communication capabilities was designed. First, the topological structure of the field network, the networking process of the central node and the free nodes and the dynamic maintenance mechanism of the network were discussed in detail. Secondly, the routing measurement mechanism for creating a hybrid routing table and the improved layer limit shortest path routing algorithm were presented. On this basis, each node in the network could choose the optimal communication media at any given moment to create communication links with the adaptive data transfer speed according to the real-time hybrid routing table. Finally, the dual-mode heterogeneous field network was applied to the electricity consumption information collection system and tested in the laboratory and jobsite. The test results show that the dual-mode field network was more effective than the single-mode field network in shortening the reading meter time and increasing networking success rate.

In order to improve forwarding rate and connectivity rate between these nodes of the power distribution field network, an adaptive selection scheme for multi‐path parallel forwarding in dual‐mode heterogeneous field network is designed. First, the topological structure, the networking process and network maintenance mechanism of the field network with high speed power line broadband carrier and high speed micro‐power radio frequency communication capabilities are discussed. Second, a link measurement method is designed based on sliding window weighted average, and hybrid multi‐path routing table is calculated using a modified Bellman‐ford shortest path algorithm with limited hops. On this basis, a multi‐path parallel forwarding scheme is designed which has three modes of multi‐path load balancing forwarding, single‐path forwarding and multi‐path redundant forwarding. Finally, the field network is applied to the power distribution information collection system. The test results showed that the dual‐mode field network was more effective than the single‐mode field network in increasing the copying rate and shortening the copying time. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

Most of the low-voltage distribution networks are three-phase four wire systems. Because of the quantity and dispersion of single-phase power users, the three-phase load unbalanced problem exists in a large number of low-voltage stations. With the continuous increase of power consumption level of the majority of power customers, the three-phase load unbalanced has become increasingly prominent in low-voltage station area. In this paper, the mechanism of three-phase unbalance generation and the defects of traditional treatment methods are introduced. On this basis, a three-phase unbalanced treatment scheme for low-pressure station area is proposed. The scheme can test out three-phase imbalance of low-voltage substation area quickly and accurately, and adjust the load phase sequence in real time without power failure through the intelligent commutation switch system, so that three-phase load in the station area lies a comparatively balanced condition. The scheme can cut down the loss of transformer and line caused through unbalanced three-phase load e in nicely. And it can restrain single-phase overcurrent, and solve the problem of terminal low voltage treatment.