Abstract
Since the communication network of the cyber-physical power system is responsible for communicating information, which guarantees the operation of the cyber-physical power system, researchers focus on the stability of the communication system. This article analyzes the risk of the communication transmission link interruption based on the network structure and characteristics of service transmission and proposes a path optimization method. First, we analyze the impact of link disruption on network structure and service, respectively, and quantify the impact as link interruption risk. According to the risk analysis, we propose an optimization method utilizing the Dijkstra’s algorithm and the genetic algorithm to reconfigure service paths, which aims to minimize time delay and realize the equilibrium of service distribution. Through a particular situation, we calculate the link interruption risk and use the optimization method to configure service path for affected service. The results show that the time delays of the optimized service paths are in the acceptable level as well as the balance index of the service distribution is decreased obviously. The simulation experiment reveals the operability of the risk analysis method and the effectiveness of the path optimization method, which provides a technical reference for risk analysis and service path configuration.
Highlights
Power system and information and communication technology are integrated into Smart Grid, or so-called ‘‘cyber-physical power system.’’1 in Smart Grid, a lot of wireless sensors is distributed to monitor equipment status information.2 Smart Grid is established on the basis of the high-speed, duplexing, real-time, and integrated communication system
In section ‘‘Path optimization method,’’ we propose a path optimization method utilizing Dijkstra’s algorithm and genetic algorithm (GA) to reconfigure the service paths after link destruction, which aims to decrease the transmission delay and network service balancing index
To evaluate the impact of link interruption on the communication network in Smart Grid, this article builds a risk analysis model of link interruption and proposes a path optimization method for the services carried on the broken links
Summary
Power system and information and communication technology are integrated into Smart Grid, or so-called ‘‘cyber-physical power system.’’1 in Smart Grid, a lot of wireless sensors is distributed to monitor equipment status information. Smart Grid is established on the basis of the high-speed, duplexing, real-time, and integrated communication system. Guo and Ming analyzes the reliability of optical transmission equipment and optical fiber links based on the three-level topological structure of the power communication network It builds up service path risk assessment model. We can quantify the impact of link interruption using the ratio between the number of cut points and the total number of network nodes. The number of the service carried on each communication link will be changed if the original main path is switched to the backup path. We use the difference between the network service balance degree before and after the communication link interruption to assess the impact on service. For the link without generating cut points, the impact on network structure is just concerned with connectivity degree, that is, N = S. When x links are interrupted, the total link interruption risk in the communication network is
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