Multi-objective Routing Optimization for Electric Power Communication Network Considering Business Importance

Electrical power communication networks undertake complicated power services. They interact with physical power grids all the time, which will result in a high risk to power grids when their electric power communication network is attacked. Therefore, to improve the reliability of power systems, it is of great significance to identify the key links of communication networks. Existing research studies focus more on the risk of power communication services undertaken by communication links, which ignores the frequent interaction between power grids and communications networks. In this paper, from a multi-layer network perspective, an assessment method of communication equipment is proposed in view of the operation characteristics of nodes in different systems as well as the dynamic fault propagation between homogeneous communication nodes. Firstly, we build a model of cyber-physical power interdependent network. Then, for communication nodes, a dynamic model is adopted for cascading failure among the nodes based on the load-capacity model. Afterward, we define an index to evaluate the node importance considering characteristics of the operation of both communication networks and power grids. Finally, a local power grid is taken as an example for verification by comparing the effects of different indexes. The simulation results demonstrate the validity of the evaluation method proposed.

With the development of the energy Internet, power communication services are heterogeneous, and different power communication services have different business priorities. The power communication services with different priorities have different requirements for network bandwidth and real-time performance. For traditional unified service, a scheduling method cannot meet these service requirements at the same time, and electric power communication network cannot guarantee the quality of service. Therefore, how to make full use of the time-varying characteristics of communication resources to meet the business needs of different priorities and achieve the goals of high resource utilization and transmission quality has become one of the urgent problems in the power communication network. For this reason, in order to adapt to the real-time congestion of the network, we have designed a packet scheduling method based on the dynamic adjustment of service priority, which dynamically adjusts the priority of the power service on the node; in addition, an evaluation method for the trust value of wireless forwarding nodes is introduced to improve the security of data transmission; and finally, we valuate the channel quality to establish a reasonable and efficient packet scheduling mechanism for services of different priorities. Simulation results show that this method improves the communication performance of high-priority services and improves the spectrum resource utilization of the entire system.

Aiming at the framework of electric power communication network and the characteristic of alarm data, this paper investigates the alarm correlation and fault location of electric power communication network. Taking into account dependency search tree which can decrease searching space and nodes of overlay, a method of fault location in electric power communication network based on dependency search tree is proposed. Alarms belonged to one class in alarm set are aggregated, and they are replaced by center node. In this way, large numbers of alarms are reduced and they can express the fault information accurately. Then greedy algorithm is repeatedly used to calculate residual alarms until the exact fault nodes are found out. This method based on the model of fault transmission is easy to build a model, and it can make use of the dependency of nodes directly and it is still applicable when many faults occur. The result of practical example proves that this method can analyze alarm information of electric power communication network and locate faults rapidly and exactly. So the faults can be found out in time, then the electric power communication network can be insured to operate steadily.

Synthetically analyze the power distribution communication network technology in the smart power grid link. It mainly includes the summary of the smart distribution network, electric power communication backbone network and then layer communication requirements, the network mode and the application mode of WLAN technology in the distribution network, EPON network technology, micropower wireless technology, PTN technology and power broadband wireless systems. State the demand of the smart power distribution business and put forward technical guidance for the smart power distribution communication network scheme. In view of the complex distribution network architecture, more nodes and scattered, complex business types data business needs, put forward the integrated solutions of optical fiber communication as the backbone access, wireless bandwidth, passive optical communication as the coverage, the short distance wireless communication as the main terminal access. It provides a reference for the communication plan of distribution side.

The maximum flow problem of uncertain network

This paper develops a simple algorithm for having robust optimal computer control in decentralized stochastic singularly-perturbed systems by poles assignment. This type of noise-disturbed system can be often seen in computer controlled large-scale systems such as electric power systems, communication networks, and aerospace systems. Due to that this computer controlled system possesses the fast response characteristics of the subsystems, the system analysis can be simplified by singularly perturbation methodology and the aggregation matrix is also applied to obtain faster calculation. Finally, the aggregation matrix is found out that will be an important intermediary to easily achieve the robust sub-optimal poles assignment. In the end, three steps are proposed to complete the robust sub-optimal pole assignment.Keywordsrobustcomputerpoledecentralizedstochasticsingularly-perturbedaggregation matrix

With the extensive construction of integrated network management system for electric power communication, the practical level of construction has become a key factor on its effective. This article analyzes the advantage and necessity of the construction of integrated centralized power communication network management system, review and summarize the electrical communication in real-time operation, maintenance management, operating mode management, professional management, the integrated management and control needs, professional collaborative management six aspects of the functional requirements analysis, elaborate communication network management system application exploration and research, and the future utility of the road overall construction ideas.

智能变电站在电力系统中处于重要地位，为了满足电力系统的要求，电力通信网结构不断地进行优化，大量引进通信领域新技术，使得电力通信网越来越复杂。影响变电站通信安全的因素日益增加，变电站通信网络安全这一问题变的日益复杂。本文以智能变电站的通信网络为基础，对智能变电站通信网络的发展历程进行简要介绍，分析比较几种通信技术的优缺点，针对变电站信息安全面对的威胁以及现阶段管理现状、管理制度等在实际运行中存在的问题进行深入讨论，全面研究分析了变电站面临的信息安全问题。 Intelligent Substation in the power system is an important factor. In order to meet the power system require- ments, the system constantly optimizes power communication network structures, including massive introduction of new communications technologies, making electric power communication network more complex than ever. Factors affecting the substation communication safety are increasing. Substation communication network security problems become more complex. In this paper, intelligent substation communication networks based on intelligent substation communication network development process are briefly described, and the advantages and disadvantages of several communication technologies are analyzed and compared . In the end of the article, this paper comprehensive analyzed substation informa- tion system threats, present management situation and management system in actual operation.

With the development of large-bandwidth and IP-based bearer services in the power communication network, the existing SDH+PTN transmission system has been unable to meet the business development requirements during the "14th Five-Year Plan" period. SPN technology has evolved from PTN technology, which not only can provide ultra-large bandwidth, but also has highly reliable hard isolation (FlexE), which can carry low-delay scheduling data networks and other control services in areas I and II, as well as Carrying large-bandwidth data communication networks and other management services in areas III and IV. This paper proposes a test plan for the SPN analog networking, and tests the service isolation capability, transmission delay, and hybrid networking capabilities of the SPN networking. The analysis and comparison of the test results can provide support for the introduction of SPN technology by Shandong Electric Power during the "Fourteenth Five-Year Plan" period, and at the same time lay the foundation for the development of the transmission system of the electric power communication network.

The Study on the Communication Network of Wide Area Measurement System in Electricity Grid

In order to realize the real-time monitoring of temperature, wireless temperature sensor network is put in the temperature-measuring point in the substation, and then it is transit to the base station through wireless transmission. Finally, by the base station, it is transmit to the management center through the electric power communication network. The temperature management software monitors the temperature timely, visually displays and alarm linkage etc.al. Indoor and outdoor experiments show that the system operates reliably and has good effects, which can accurately realize the online temperature monitoring in a substation.

In this paper, the network security measures in electric power communication network are deeply studied, aiming at improving the network defense ability of key infrastructure. The research scope covers the implementation and effect evaluation of key security measures such as encryption algorithm, authentication mechanism and realtime monitoring system. Firstly, through the performance test of different encryption algorithms, the influence on communication links is evaluated. The experimental results show that under the premise of ensuring communication security, the strong encryption algorithm has relatively little impact on network performance, which provides a safe and efficient means of data transmission for power communication networks. Secondly, the gain effect of multilevel authentication on network security is discussed. By using multi-factor authentication methods, such as passwords, smart cards and biometrics, the experimental results show that this authentication strategy effectively improves the network's ability to resist unauthorized access and effectively reduces potential security threats. In the aspect of realtime monitoring system, this paper establishes an experimental environment, and verifies the effectiveness of realtime monitoring in detecting and responding to abnormal behavior by simulating various attack scenarios. The results show that the realtime monitoring system can detect potential security incidents in time and provide strong support for network administrators, thus improving the overall security awareness of the network. In the electric power communication network, adopting comprehensive network security strategies, including strengthening the encryption of communication links, multilevel authentication and the establishment of realtime monitoring system, can significantly improve the network security without sacrificing performance. This provides strong support for the long-term security of electric power communication network, and puts forward useful suggestions for the future research and practice of network security.

A resource allocation approach based on a simulated annealing algorithm in electric power communication networks

Under the current trend of abundant information on power business, large data concentration, and large flow explosion, aiming at the randomness, volatility, and uncertainty of massive flow of electric power communication network, a digital power flow prediction method based on VMD-LSTM-SVM model is proposed. The interaction between the values of each traffic index before and after time is considered. LSTM is used to process traffic data and make an accurate prediction of future traffic. The power communication network can make dispatch responses to possible communication congestion by using link resources according to traffic prediction results and ensuring the transmission quality of power service data.

Collaborative optimization of distribution network and 5G base stations considering its communication load migration and energy storage dynamic backup flexibility