Adaptive selection scheme for multi‐path parallel forwarding in dual‐mode heterogeneous field network of power distribution grid

Abstract

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.

Precise Clock Synchronization Strategy of Power Distribution Field Network Based on HPLC Communication

“…Assuming that the clock time deviation of the node is T OFF , the number S of adjustment steps is 8, the synchronization time duration of each step is T s , and the adjustment weight value of each step is V i (i ∈ [1,8]) with a decreasing manner, take this for example to illustrate the step-by-step clock synchronization strategy, as shown in Fig. 6.…”

“…The power distribution field network mainly undertakes the electric power distribution task of the last mile in the construction of the power internet of things on the customer side of the smart grid [1], and whose applications have expanded from a single electric power consumption information collection to orderly charging, distributed energy storage, high‐frequency information collection, comprehensive energy metering and many other fields. Most of these applications require the clocks of network nodes to be synchronized, because performing a joint task requires all of the nodes to operate on a common time scale [2].…”

“…At present, the clock synchronization of the information center and the smart substation in the power distribution network mainly adopt the network time protocol (NTP) [4], the precise time protocol (PTP) [5], or global positioning system (GPS). The power distribution field network is a sensor networks used in the power distribution network, whose network devices are mostly embedded low‐cost equipment, and usually faces high urbanization and high density, especially in complex and harsh scenarios such as high‐rise concrete buildings and basements [1]. The NTP and PTP work well synchronizing computers on the Internet, but are not suitable for use in sensor networks because of complexity and computation limitation, cost, and size factors [6,7].…”

“…The narrow‐band power line carrier (PLC) communication and micro‐power radio frequency (RF) communication are the two main communication methods in power distribution field network [1]. The PLC uses the laid electric power line which has a very wide coverage to transfer information between remote locations.…”