Power System Information Research Articles

Research on Efficiency Evaluation Model of Electric Power Information System

he information technology has greatly driven the development of Smart Grid, however, the risk of system operation has been significantly increased simultaneously with improving the intelligent operation level of Grid system, therefore, how to construct an efficiency evaluation model of electric power information system effectively has been becoming an important subject to be explored for many experts. And based on that, this paper presents an efficiency evaluation model of electric power information system in view of the adjacency matrix. Firstly, the attack process is divided into two stages from the perspective of an attacker, namely, selecting to attack the access points and attacking other access points; secondly, it describes the intelligent selection capability of the attacker by using the transfer probability index between the nodes; finally, it conducts the computational analysis by introducing an example, to prove the practical applications of the proposed methods.

Role-Based Services Certification Model of State Grid Unified Application Platform

With analyzing the cause and characteristics of security problems in the current power State Grid Unified Application Platform, this paper proposes a Role-Based Services Certification Model, RBSCM, to solve the security problems in electric power information system and designs a generalized and effective mechanism of security management. The paper provides a set of constraint specifications. These constraint specifications of RBSCM are organized to form a construction, and an enact process is proposed to make it scalable and flexible to meet the need of diversified service application systems.

Analysis and Application of Information Security Evaluation Abilities Based on Power Control Systems

With the widely application of power control systems and acceleration of the information modernization process of the power industry, the connection between power control system products and information security is closer and closer. This paper, through the analysis of the safety standard on power control systems, the combination with the existing power information system evaluation and the integration of the idea of full life cycle, research on the safe evaluation environment and the standards, processes and contents of evaluation technology in power control systems. It shows that to analysis and application of information security testing evaluation which is based on power control systems is meaningful and necessary.

Research on Power System Communication Operation and Maintenance Outsourcing Model

With the using of power system communication and information technology more widely, operation and maintenance services to support integrated, large-scale, professional management presented a greater challenge, how to find a better balance point in their operation and maintenance and service outsourcing will be the key issue. Conducted from IT Operation Outsourcing Management Development profiles, patterns, application scenarios and trends multi-dimensional studies, and in-depth analysis of the power system operation and maintenance outsourcing management characteristics, laid the theoretical foundation for the future development of the operation and maintenance of communication and information systems outsourcing management.

Research on the Application of WPT-EEMD Method in the Fault Diagnosis of AESPS

All Electric Ship Power System (AESPS) is constituted by the core power plant system with marine generators and large power propulsion motors, and by the electrical apparatus, which is set up for providing energy for other parts of ship and transmission. Effective fault diagnosis of AESPS is the technical prerequisite to drive electric ship safely and to avoid accidents. In this paper, we used the wavelet packet transform (WPT) to separate signal from noise, and extracted the fault feature information submerged in the noise. After that, we used the Ensemble Empirical Mode Decomposition (EEMD) to analyze the reconstructed signal to get several intrinsic mode functions (IMF). Finally, we obtained the marginal spectrum through the Hilbert-Huang transform (HHT). Theoretical and experimental study results show in the end: the marginal spectrum, with WPT-EEMD method, underlines the fault feature information of power system, which is an effective way to diagnose the fault type.

Power Information System Risk Assessment Method Based on Genetic Algorithms and Neural Network

In order to scientifically and accurately evaluate power information system, the new power information risk evaluation method based on the genetic algorithm and BP neural network is presented. The method combining the genetic algorithm and BP algorithm can be used to train the feedforward neural network , namely, first , to use the genetic algorithm to do the global training, then ,to use BP algorithm to do local precise training ,which not only overcomes the drawbacks of the traditional BP network (the training time is long, and the network is easy to fall to local extremum),but also improves the global convergence efficiency. The method was adopted to evaluate the power information system. And findings identify that the new method has distinctive convergence speed and high predicition accuracy, which provides a new concept for power information system risk assessment.

Internet of Things Technology and its Applications in Smart Grid

Smart grid is the latest trend of development and reform in today’s world, and it is also a major technological innovation and development trend in the 21st century. Internet of Things technology is a new information processing and acquisition method, and it has been widely used in intelligent transportation, environmental monitoring and other fields. Internet of Things is an important technical mean to promote the development of smart grid. Using Internet of Things technology can effectively integrate the infrastructure resources in communications and electrical power system, increase the level of power system information, and improve the utilization efficiency of infrastructures in the existing power system. In this paper, the concept of smart grid and Internet of Things are briefed, thus the urgency of its applications in smart grid are pointed out. Meanwhile, a research and design in the construction of smart grid which is based on Internet of things are made, and the design and implementation in typical application links, including wind power prediction, condition monitoring of overhead transmission lines, power monitoring, smart home and asset management are elaborated emphatically. Finally, the problems in applications and future research direction are also analyzed. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.4178

Cloud Monitoring for Solar Plants with Support Vector Machine Based Fault Detection System

This study endeavors to develop a cloud monitoring system for solar plants. This system incorporates numerous subsystems, such as a geographic information system, an instantaneous power-consumption information system, a reporting system, and a failure diagnosis system. Visual C# was integrated with ASP.NET and SQL technologies for the proposed monitoring system. A user interface for database management system was developed to enable users to access solar power information and management systems. In addition, by using peer-to-peer (P2P) streaming technology and audio/video encoding/decoding technology, real-time video data can be transmitted to the client end, providing instantaneous and direct information. Regarding smart failure diagnosis, the proposed system employs the support vector machine (SVM) theory to train failure mathematical models. The solar power data are provided to the SVM for analysis in order to determine the failure types and subsequently eliminate failures at an early stage. The cloud energy-management platform developed in this study not only enhances the management and maintenance efficiency of solar power plants but also increases the market competitiveness of solar power generation and renewable energy.

Data Intergration of Power Information System Based on Ontology

Power system data distributed in different locations of heterogeneous information systems on the multiple network . These systems are different in the architecture and also in different areas of expertise. In view of the above questions thispaper has proposed a power system integrated research plan baseed on ontology, mainly discussed on local ontology mapping between the data source. Focus on how to convert from the database relational model to OWL ontology and gives the ER model to OWL ontology from the conversion algorithm. Compared with the similar method, this method is automated build ontology, and overcomed the manually created ontology can bring a lot of tedious work.

Multiple Time-Varying Delays Analysis and Coordinated Control for Power System Wide Area Measurement

The stability of wide-area power system with multiple time-varying delays is investigated in this study. It is known for all that power system is a delay system for wide area measurement information of power system. Therefore, transmission time delay can not be ignored and it has great impact on the controller design. The steady stability analysis model of power system with multiple time-varying delays is constructed. The criterion of stability is formulated as feasibility problems of linear matrix inequality. According to the characteristics of the time-varying delays, the feedback controller is separated into two parts: The first level of control is derived from local signals without time delay and the second level of control is supplied from other generators with different time-varying delays. Taking a four-machine power system as example, the performance of the proposed controller is validated by the results of simulation in time-domain and it is proved that the proposed method is effective.

Research and Construction of Information Security Simulation Test Bed for Electric Power System

Electric power system relies heavily on common information technologies and platforms, so all common information security issues have been experienced in the electric power information system. Because of attacks destructivity and uncontrollability, it is inappropriate to conduct security analysis in a real Power system directly. Therefore, the paper uses simulation and emulation technology to build a information security test bed for power system at a lower cost and no affect the normal operation and the premise of the aimed system. Simulation contents in the test bed are arranged in four different layers including firmware layer, system layer, network layer and application layer. The test bed also provides a network attack and defense combat system. The test bed can be used for Power system information and network system security testing, engineering validation and evaluation.

Design and Implementation of a Data Parsing Module for Power Information Equipment Log Management System

in order to manage the log information of Windows servers, Linux servers, network devices and security devices in a unified, so as to query log data, analysis and audit log data conveniently, a program is put forward, in which a variety of power system information devices log data be converted into a unified relational model and integrated into the database. The data parsing module uses the Windows Workflow procedure to select, clean and merge the massive log data. The database is created and operated by Microsoft SQL Server 2005 development platform. All of the log files have to be converted into a unified format and saved in centralized storage. Experiments and test results show that the module has a good efficiency of data processing and integration, and it greatly increases the proportion of valid data. It provides supports for efficient log auditing and fault diagnosis in the future.

Communication Feasibility Analysis for Smart Grid With Phasor Measurement Units

The conventional power system is going through a paradigm change towards smart grid. Phasor measurement units (PMUs) have emerged as the edifice for information technology related to wide-area monitoring systems (WAMSs) for power system monitoring, information communication, and control purposes. The PMUs require communication links for a complex interconnected power grid, and proper spatial coordination plays a vital role for wireless communication network. Geographical information system (GIS) provides a rich set of functions to analyze the power network incorporating geospatial features. This paper investigates the impact of topological attributes on commissioning of wireless communication network for PMUs incorporating GIS aided analysis and to optimize one of the PMU location as main control station. This will not only serve for monitoring automation purposes, but will also ensure control automation. Case studies related to the eastern grid of India corroborate the efficacy of GIS-aided wireless communication for linking PMUs.

Design of Ground Power Information System for EMU

In order to guarantee the operation safety, maintenance and servicing to the EMU often need to stop high voltage power supply, and switch to the ground power supply. This paper proposes a ground power information system of EMU, in this system, industrial field bus is composed of the single-phase power box, socket box and gateway, it is connected to the centralized control cabinet and the self-diagnostic terminal through the hub that constitute the information network, to realize the free transfer and exchange of data, and the centralized information management and control of the whole system, has a good promotion prospects.

Detecting Critical Nodes in Interdependent Power Networks for Vulnerability Assessment

Power networks and information systems become more and more interdependent to ensure better supports for the functionality as well as improve the economy. However, power networks also tend to be more vulnerable due to the cascading failures from their interdependent information systems, i.e., the failures in the information systems can cause the failures of the coupled portion in power networks. Therefore, the accurate vulnerability assessment of interdependent power networks is of great importance in the presence of unexpected disruptive events or adversarial attacks targeting on critical network nodes. In this paper, we study the Interdependent Power Network Disruptor (IPND) optimization problem to identify critical nodes in an interdependent power network whose removals maximally destroy its functions due to both malfunction of these nodes and the cascading failures of its interdependent communication network. First, we show the IPND problem is NP-hard to be approximated within the factor of (2-ε) . Despite its intractability, we propose a greedy framework with novel centrality functions based on the networks' interdependencies, to efficiently solve this problem in a timely manner. An extensive experiment not only illustrates the effectiveness of our approach on networks with different topologies and interdependencies, but also highlights some important observations which help to sharpen the robustness of interdependent networks in the future.

Wireless Power and Information Synchronous Transmission Technology Based on Magnetic Resonance

In order to solve the problem that electromagnetic induction widely used now is just suited to short distance transmission, and study on the transmission characteristics of wireless power transmission system based on magnetic resonant coupling, a novel method that the two separate-coupling coils achieve wireless power and information synchronous transmission is proposed. The basic theory of wireless power transmission and information system is introduced. The condition that resonant frequency splitting phenomenon is produced of a contact-less power transmission system has been deduced, and it depend on the length of distance between the two coils. The principle prototype of transmission system is designed, and transmission characteristics of the system are analyzed by simulation and experiment. Based on circuit formulation, maximum efficiency is found to exist. The results show that the method of wireless power and information synchronous transmission system is in agreement with theoretical analysis.

A New Security Baseline Reinforcement Method for the Power Information System

Power information is a typical distributed interconnect system, faced with a complex network security problems. It still lacks a systematic method for the design and evaluation of system security. The authors comprehensively survey the layout of the power network and also ISO27001 international standards, and proposed a new security baseline reinforcement method for the power information system. By using the multi-class fuzzy comprehensive judgment model and the SSE-CMM method, the authors proved the reinforcement method is reliable in theory. This method combines ISO27001 PDCA model with the security baseline testing process, and applies ITU-T X.805 security architecture to the testing indicators extraction process, which makes the security evaluation process for the power information system quick and practical.

Securing smart grid: cyber attacks, countermeasures, and challenges

Smart grid has emerged as the next-generation power grid via the convergence of power system engineering and information and communication technology. In this article, we describe smart grid goals and tactics, and present a threelayer smart grid network architecture. Following a brief discussion about major challenges in smart grid development, we elaborate on smart grid cyber security issues. We define a taxonomy of basic cyber attacks, upon which sophisticated attack behaviors may be built. We then introduce fundamental security techniques, whose integration is essential for achieving full protection against existing and future sophisticated security attacks. By discussing some interesting open problems, we finally expect to trigger more research efforts in this emerging area.

The relationship among power types, political games, game players, and information system project outcomes — A multiple-case study

This paper presents a study of the information system project development (ISPD) process by examining 56 cases through the lens of McClelland's power type/political behavior (games) relationship theory. In this research, 192 political games were drawn from the 56 cases. These political games were categorized into 23 kinds and 4 types of power. The study found that the types of player power are complex and that the relationship between the types and kinds of political games displayed depends on the ISPD context. In addition to producing 4 major adverse effects, various kinds of games were found to be instrumental in successful IS project outcomes, the major players in which being MIS professionals. It is hoped that the detailed descriptions obtained from the data will be able to reduce, or even prevent, negative consequences arising in the ISPD process of other similar enterprises.

EPPA: An Efficient and Privacy-Preserving Aggregation Scheme for Secure Smart Grid Communications

The concept of smart grid has emerged as a convergence of traditional power system engineering and information and communication technology. It is vital to the success of next generation of power grid, which is expected to be featuring reliable, efficient, flexible, clean, friendly, and secure characteristics. In this paper, we propose an efficient and privacy-preserving aggregation scheme, named EPPA, for smart grid communications. EPPA uses a superincreasing sequence to structure multidimensional data and encrypt the structured data by the homomorphic Paillier cryptosystem technique. For data communications from user to smart grid operation center, data aggregation is performed directly on ciphertext at local gateways without decryption, and the aggregation result of the original data can be obtained at the operation center. EPPA also adopts the batch verification technique to reduce authentication cost. Through extensive analysis, we demonstrate that EPPA resists various security threats and preserve user privacy, and has significantly less computation and communication overhead than existing competing approaches.