A Simple Approach to Robust Optimal Pole Assignment of Decentralized Stochastic Singularly-Perturbed Computer Controlled Systems

The maximum flow problem of uncertain network

The path congestion and communication risks of electric power communication network have emerged as the carried businesses are becoming more and more heavy. In this paper, a multi-objective optimization method for power communication network routing considering the importance of the carried businesses is proposed to reduce load imbalance and transmission risk. Firstly, information entropy is introduced as the objective of communication network load balancing optimization. And a risk assessment model for power communication network nodes and links is established. Then fuzzy membership functions are adopted to singularize the two objectives to jointly optimize path congestion and communication risks. The device nodes are dynamically divided according to the carried businesses to pursue the global optimization of the power communication network in which the Yen's algorithm is adopted. Finally, this paper uses the IEEE 30-bus communication network to carry out case simulations and analyzes the proposed method to verify the effectiveness and feasibility.

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.

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.

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.

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.

The design of a 750 kJ sequentially-fired pulse forming network (SFPFN) is described and recent experimental results in the case of a linear load are presented and compared with simulations. The principal advantages of the sequentially fired network over its passive analogue are its utility in both linear and non-linear load applications. Operation of the SFPFN consists of charging multiple capacitor banks to various levels and sequentially firing these banks into the load at appropriate times. The load characteristics and desired pulse attributes determine the module charge voltage and sequential firing schedule. The SFPFN uses a computer controlled field programmable gate array (FPGA) to trigger the individual module firing intervals. The use of a computer controlled firing circuit provides an opportunity to incorporate real-time load monitoring and feedback to select optimal firing times and durations based on dynamic load conditions. Real-time monitoring also allows for firing sequence abortion in the event of a fault or other potentially harmful event. The charging controller features a computer monitoring and control system to allow a single power supply to charge multiple capacitor modules by an array of switching relays, even though each module may be charged to a different voltage. In linear load testing, the SFPFN provided a relatively constant current pulse to a resistive load.

Fault tree analysis (FTA) has been widely utilized as a reliability evaluation technique for complex systems, such as nuclear power plants and aerospace systems. However, it is hard to obtain the crisp failure probabilities of basic events, owning to the insufficient information about some complex engineering systems. Hence, fuzzy set theory and fuzzy arithmetic operation (FAO) have been used as effective methods to analyze system reliability. However, it is cumbersome to evaluate complex systems based on FAO. To improve the evaluation efficiency, stochastic computational models are proposed in this paper to perform reliability analysis of a fuzzy system. Due to the features of Gaussian distribution in stochastic computation, a basic event’s failure possibility given by a fuzzy number is transformed into the expected value of it. The standard deviation of stochastic computational results gives the spread of the fuzzy number. A fuzzy system is then converted into a deterministic system. The analysis of an illustrating example shows that the proposed stochastic approach can efficiently evaluate the failure probability of a system.

Study of a single-cell protein fermentation process for computer control

Communication Access Network of Electric Power System is the key of Communications Network for Smart Grid. There are kinds of access technologies of Telecommunications for Electric Power System. However there is not a unified software platform for electric power communication access devices based on these technologies. So it cannot be adapt to the rapid development of electric power communication equipment, communication test, flexible configuration, and also cannot be quickly adapt to changes in the electric power communication needs. This paper introduces Reconfigurable Switch Software Platform (RSSP) s design, analyzes the architecture of RSSP in detail. As an example, this paper also proposes an implementation scheme of OLT based on RSSP.

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.

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

The negative-ion based NBI System for JT60U (N-NBI), the first NBI system in the world using negative ion sources, was completed in March 1996. The computer control and data acquisition system of the N-NBI consists of workstations and VMEbus systems. The software development environment of the system is unified with the UNIX to develop the software more efficiently. The system can facilitate remote operation of the two negative ion sources of the N-NBI.

Survey of Multi-Level Computer Control Systems in the Pulp and Paper Industry