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International Conference on Electrical and control engineering (ICECE)

作者： Fu Wei Tong Shi-hua Zhang Ya-chao Zhang Jun Key Laboratory of Network Control & Intelligent Instrument ministry of Education Chongqing University of posts and telecommunications Chongqing China Computer application Department Chongqing College of Electronic Engineering Chongqing China

This paper is to introduce the design and optimization the PoE Hub with redundancy based on the principle of EMC; through the simulation and analysis by FEM to the effectiveness of the hub of the electromagnetic shielding to enhance anti-interference performance of the hub according to the optimization to the problems discussed in the simulation. Having the aid of EMC simulation software, the analysis problem being found during the test of hub is also get the effective solution. The method of the analysis testing and problem-solving will be the guidance and reference to the design and research of the network equipment based on the principle of EMC in the future.

关键词： Finite element methods Electromagnetic compatibility Analytical models Redundancy Computational modeling Ethernet networks Electromagnetic shielding

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Research and Implementation of the Security Method Based on WIA-PA Standard

Research and Implementation of the Security Method Based on ...

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International Conference on Electrical and control engineering (ICECE)

作者： Wei Min Xuan Zhang Wang Ping Keecheon Kim Younghan Kim Department of Computer Science and Engineering Konkuk University Seoul South Korea Key Laboratory of Network control & Intelligent Instrument Chongqing University of Posts and Telecommunications Chongqing China School of Electronic Engineering Soongsil University Seoul South Korea

Wireless Industrial communications is emerging technology after the Fieldbus in industrial field. Since the industrial control application is needed in wireless industrial technologies, WIA-PA standard is defining the protocol suite, system management, gateway, and security for low-data-rate wireless connectivity with fixed, portable, and moving devices supporting limited power consumption requirements. This paper presents the security architecture and security protocol based on WIA-PA. Furthermore, we design and implement the security communication services. Finally, the test results illustrate that these security measures may enhance the security reliability of the WIA-PA network communication.

关键词： Cryptography Protocols Wireless networks Microwave integrated circuits Payloads

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The simulation and analysis of the electromagnetic shielding effectiveness of PoE-Hub with redundancy by FEM

The simulation and analysis of the electromagnetic shielding...

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International Conference on Electrical and control engineering, ICECE 2010

作者： Fu, Wei Tong, Shi-Hua Zhang, Ya-Chao Zhang, Jun Key Laboratory of Network Control and Intelligent Instrument ministry of Education Chongqing University of posts and Telecommunications Chongqing 400065 China Computer Application Department Chongqing College of Electronic Engineering Chongqing 401331 China

ISBN: (纸本)9780769540313

This paper is to introduce the design and optimization the PoE Hub with redundancy based on the principle of EMC;through the simulation and analysis by FEM to the effectiveness of the hub of the electromagnetic shielding to enhance anti-interference performance of the hub according to the optimization to the problems discussed in the simulation. Having the aid of EMC simulation software, the analysis problem being found during the test of hub is also get the effective solution. The method of the analysis testing and problem-solving will be the guidance and reference to the design and research of the network equipment based on the principle of EMC in the future. © 2010 IEEE.

关键词： Electromagnetic compatibility

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Modeling and simulation of a microturbine generation system based on PSCAD/EMTDC

Modeling and simulation of a microturbine generation system ...

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International Conference on Critical Infrastructures, CRIS

作者： Gang Li Gengyin Li Wei Yue Ming Zhou K L Lo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

Distributed generation (DG) technology has drawn increasing attention for its tremendous benefits to customers, utilities and the environment. Furthermore, microturbine based power generation has become the most promising DG for its excellent record of improving system stability and economy. In this paper we develop a complete mathematic model, which includes the microturbine, a permanent magnet synchronous generator (PMSG), a three-phase bridge AC to DC rectifier, a boost converter and a DC to AC inverter. The simulated microturbine generation system (MTGS) model is a single shaft type with control systems and capable of regulating its output power in grid-connected mode. Also, the design and modeling of a MTGS which is suitable for isolated operation are explained with the ability of electronic controls that maintains the output voltage at their prescribed levels. Different load conditions are applied to the MTGS for evaluation of the validity and practicability of the model. Simulation studies have been carried out in PSCAD/EMTDC under different load conditions. Simulation results testify that the MTGS developed from this model can produce predictable results with these control methods.

关键词： Fuels Mathematical model Load modeling Inverters Power generation Voltage control Torque

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An improved grey model for forecasting spot and long term electricity price

An improved grey model for forecasting spot and long term el...

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International Conference on Power system Technology (POWERCON)

作者： Zheng Yanan Gengyin Li Ming Zhou Shan Lin K L Lo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

With the deepening reform to power industries, power systems are going to gradually open the demand side and the power consumers have to face the changes of their role in the market, and make a preliminary long-term forecasting for the electricity prices. In order to consider the relations between the spot market and the long-term contract market, this paper builds a multi-electricity price grey model to comprehensive forecast the prices of the 2 markets; further researches the structure of the background value, and improves the multi-electricity price grey model; and introduces the residual error, the related grade, the mean variance ratio and the little probability of error as test indexes. The test results show that the multi-electricity price grey forecasting model and its improved model have better accuracy, and the improved model has stronger adaptability and extends the application range.

关键词： Forecasting Contracts Predictive models Electricity Accuracy Fitting Indexes

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Energy storage control for the Photovoltaic generation system in a micro-grid

Energy storage control for the Photovoltaic generation syste...

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International Conference on Critical Infrastructures, CRIS

作者： Zhongqiu Wang Xi Li Gengyin Li Ming Zhou K L Lo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

Distributed generation (DG) that uses renewable energy sources has an unstable output and this can negatively affect existing electric power systems. In order to reduce above impact, we need to develop an energy control system to control the output through individual DG installed in a micro-grid. First, this paper designs a grid-connected Photovoltaic (PV) system and introduces the operation principle of the various parts as well with the control strategy of the power flow. The design of energy storage is of great significance as the output power of PV cells array is greatly affected by the light intensity and the temperature change. Then, it uses the battery as the energy storage device and designs the charge-discharge control strategy according to the characteristics of the battery. Finally it verifies the feasibility of the energy storage control strategy through the simulation models which is built based on the PSCAD/EMTDC platform.

关键词： Batteries Discharges Voltage control Arrays Solar power generation

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The generating mechanism and optimal control of power quality in micro-grids

The generating mechanism and optimal control of power qualit...

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International Conference on Power system Technology (POWERCON)

作者： Xi Li Zhongqiu Wang Gengyin Li Ming Zhou K L Lo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

As an important component of distribution network, micro-grid is the necessarily development trend for future. Micro-grid has greatly improved the random problems of distributed generation (DG). However, DGs, the power electronic equipments inevitably bring about power quality problems, especially voltage flicker and harmonics. This paper tries to study the operating regulations of micro-grid in order to find out the generating mechanism and propagation characteristic of power quality problems. Taking the photovoltaic (PV) system for an example, the micro-grid simulation model has been set up. The experiments show that an appropriate control strategy coordinating every part can improve the power quality of micro-grid greatly. This paper finds out the factors affecting power quality and their harm degrees, explaining the reasons of power quality problems. Coordinating every unit, this paper set up an optimal control strategy and proper parameter settings, trying to improve power quality of micro-grid to the largest extent.

关键词： Power quality Biological system modeling Inverters Harmonic analysis Power grids Integrated circuit modeling Voltage fluctuations

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A method of automatic integration test case generation from UML-based scenario

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WSEAS Transactions on Information Science and Applications 2010年第4期7卷 598-607页

作者： Ogata, Shinpei Matsuura, Saeko Course of Functional Control Systems Graduate School of Engineering Shibaura Institute of Technology 307 Fukasaku Minuma-ku Saitama-City Saitama 337-8570 Japan Department of Electronic Information Systems College of System Engineering and Science Shibaura Institute of Technology 307 Fukasaku Minuma-ku Saitama-City Saitama 337-8570 Japan

One key to success for high quality enterprise information systems development is to validate the customers' requirements sufficiently at the early stage. Scenarios are an effective means to an end because they make it possible to represent various situations of system usage. Most scenarios are defined by using a natural language or such a formal language as Unified Modeling Language (UML) and describe normal, alternative, and exceptional service flows from the point of view of system usage. As a result, scenarios make it easy for the customers to confirm their requirements intuitively because of the concreteness. On the other hand, based on the V-model, which is well-known software development process and denotes the correspondence of requirement analysis stage to integration test stage, it is desirable that the testers should test the system by using the test cases derived from the validated scenarios. We have proposed a UML-based requirements analysis (RA) model with automatic prototype system generation for enterprise Web application development. This paper proposes a way to efficiently create reliable test cases from the scenarios that have been validated by the customers using the prototype system which was generated by the RA model.

关键词： Integration testing

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Evaluation of a use-case-driven requirements analysis tool employing web UI prototype generation

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WSEAS Transactions on Information Science and Applications 2010年第2期7卷 273-282页

It has been widely acknowledged that ambiguous or incomplete customer requirements are a major reason for the failure of software development projects. A key example of this is the inconsistency between implementation image and specifications provided in the early stages of software development. To address this, we propose a method for automatic generation of user interface prototypes for developing Web-based business applications, based on the requirements specifications defined in the Unified Modeling Language (UML). In this study, we compare the proposed method with traditional use case modeling to evaluate the effectiveness of the proposed method.

关键词： Unified Modeling Language

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Fundamental modeling of vehicle power network system using VHDL-AMS

Fundamental modeling of vehicle power network system using V...

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International Symposium on Power electronics, Electrical Drives, Automation and Motion, SPEEDAM

作者： Shingo Ueno Kimitoshi Tsuji Takashi Abe Tsuyoshi Higuchi Koichi Shigematsu Department of Electrical and Electronic Engineering Nagasaki University Nagasaki Japan Advanced Vehicle Control System Eng. Dev. Toyota Motor Corporation Susono Shizuoka Japan CYBERNET SYSTEMS Company Limited Nagoya Japan

The vehicle system is a multi-domain system that requires many branches of science and engineering. Therefore the development of the vehicle system requires the use of design methodologies that utilize simulations, which have grown increasingly sophisticated in recent years. This paper describes how VHDL-AMS was used to model the powertrain, alternator and battery system that are the basic elements of the vehicle power network system, and examines the simulation results with the aim of realizing a system simulation whose scope covers the entire vehicle.

关键词： Power system modeling Mechanical power transmission Alternators Battery powered vehicles Vehicle driving Circuit simulation Engines Automotive engineering Power system simulation Carbon dioxide

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