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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Zeng, De Liang Diao, Shu Wen Hu, Yong Gao, Shan Li, Qing North China Electric Power University Beijing Key Laboratory of New Technology and System on Measuring and Control for Industrial Process Changping District 102206 Beijing China

ISBN: (纸本)9783038351344

For the problem of the abandoned large-scale wind power currently, in order to improve the utilization of wind power and make full use of wind resources, a method of using wind power to heat the condensed water through electrothermal furnace is proposed. On the basis of mass and energy conservation, through analyzing variable condition of the regenerative heating system and water-cooled condenser, the dynamic mathematical model is created and then the dynamic influence of condensed water temperature on the economy of thermal power plant is studied. This paper, taking a typical 660MW water-cooled unit as an example, discusses the dynamic characteristics of steam turbine and energy-saving effects of this method. Results show that obvious economic effects can be obtained through non-grid-connected wind power heating the low-pressure condensed water, which can reduce the steam extraction flow from steam turbine, improve the thermal efficiency of thermal power plant and save the amount of coal. It has positive significance to digging energy-saving potential of plant. © (2014) Trans Tech Publications, Switzerland.

关键词： Water temperature

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Double-Objective Optimal control for Non-Gaussian systems: An Example Study on Analytical vs Numerical Solutions

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IFAC-PapersOnLine 2015年第8期48卷 924-929页

作者： Mifeng Ren Jianhua Zhang Hong Wang Min Huang College of Information Engineering Taiyuan University of Technology Taiyuan 030024 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Control System Centre School of Electrical and Electronics Engineering The University of Manchester M60 1QD UK China State Key Laboratory of Synthetical Automation for Process Industry Northeastern University Shenyang 110819 China

Minimum entropy control has been proven to be an effective method in control of non-Gaussian stochastic systems. In this case, the entropy is proposed as a generalization of the variance measure to characterize the randomness of the process. Minimum entropy corresponds to small uncertainty (or derivation), but it cannot guarantee the tracking error approaching to zero. Therefore, mean square error also should be added in the criterion. In this paper, by using a simple example, the method of generating a representative approximation of the Pareto optimal control set is investigated in both analytical and numerical ways. And simulation results show the feasibility of the proposed double-objective optimal control method.

关键词： Double-objective optimal control non-Gaussian stochastic systems Renyi's entropy e - constrained method estimation of distribution algorithm

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Comparative study of power MOSFET drive scheme

Comparative study of power MOSFET drive scheme

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第五届国际自动化测试与仪器仪表学术会议

作者： Jia Ran Wang Liyong Xu Xiaoli Beijing Key Laboratory on Measurement and Control of Mechanical & Electrical System Beijing Information Science and Technology University

The field effect transistor is widely used due to its many advantages,but its working performance is directly affected by its drive *** paper gives a detailed description of the design requirements for the drive circuit of the MOSFET transistor,and explains the working principle of three different MOSFET drive circuits,and also studies and compares the working characteristic of drive *** puts forward the advantages and disadvantages of various drive circuits and usage occasions which provides the basis guidance for the design of the drive circuit of the MOS transistor.

关键词： MOSFET Drive Circuit

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Stepper motor driver based on FPGA with USB interface

Stepper motor driver based on FPGA with USB interface

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第五届国际自动化测试与仪器仪表学术会议

作者： Ba Xin Zuo Yunbo Wang Jifang Gu Yuhai Beijing Key Laboratory on Measurement and Control of Mechanical & Electrical System Beijing Information Science and Technology University

This paper introduces a design of stepper motor driver with FPGA chip XC3S250 E as system control core,which uses A3972 stepper motor driver chip and communicates with computer by USB *** paper analyses the design of hardware circuit and programming and simulation for A3972 module and the UART module with Verilog *** stepper motor driver has characteristics of high integration and flexible communications with computer.

关键词： FPGA A3972 stepper motor driver

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Research on Dongba pictograph character recognition methods

Research on Dongba pictograph character recognition methods

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第五届国际自动化测试与仪器仪表学术会议

作者： Yang Meng Xu Xiaoli Wu Guoxin Wang Hongjun Ding Chunyan Beijing Key Laboratory on Measurement and Control of Mechanical & Electrical System Beijing Information Science and Technology University MinzuUniversity of China

Dongba pictograph of China is presently accepted as the only pictograph in use,and Ancient Dongbaclassics are listed by the UNESCO as the "Memory of the World" in urgent need of rescue and inheritance through modern information *** paper argues the theory of Dongba pictograph character recognition based on the unique structural features of Dongba pictograph,and initially puts forward the implementation methods from image preprocessing stage to other processing stages like feature extraction,template matching,and neural network recognition,*** proves that these methods are feasible after the verification of experiments.

关键词： handwritten character recognition feature extraction template matching neural network

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Moving horizon H8 control of variable speed wind turbines with actuator saturation

Moving horizon H8 control of variable speed wind turbines wi...

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作者： Ma, Miaomiao Chen, Hong Liu, Xiangjie Allgöwer, Frank Beijing Key Laboratory of New Technology and System on Measuring and Control for Industrial Process North China Electric Power University No. 2 Beinong Road Huilongguan Changping District Beijing 102206 China Institute for Systems Theory and Automatic Control University of Stuttgart Pfaffenwaldring 9 Stuttgart 70550 Germany Department of Control Science and Engineering Jilin University Campus NanLing Renmin Strasse 5988 Changchun 130025 China

This study suggests a moving horizon H8 control scheme for variable speed wind turbines above the rated wind speed to maintain the output power at the rated value for variable operating points. A constrainedH8 control problem is solved at each sampling time with the update of not only the initial condition but also the prediction model based on different operating points. Closed-loop properties inclusive of L2 disturbance attenuation are discussed in the framework of dissipation theory. The moving horizon H8 control considers the non-linear dynamic aspect of the wind turbine, the turbulent nature of the wind and actuator saturations. Analysis and simulation results for WD34 wind turbine show possible improvements on the output electrical power regulation performance for variable operating points, while respecting actuator saturation limits. © The Institution of Engineering and technology 2014.

关键词： Wind turbines

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A molecular cryptography model based on structures of DNA self-assembly

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Chinese Science Bulletin 2014年第11期59卷 1192-1198页

作者： Yang, Jing Ma, Jingjing Liu, Shi Zhang, Cheng Beijing Key Laboratory of New Technology and System on Measuring and Control for Industrial Process School of Control and Computer Engineering North China Electric Power University Beijing China Key Laboratory of High Confidence Software Technologies Ministry of Education Institute of Software School of Electronics Engineering and Computer Science Peking University Beijing China

With the progress of DNA computing, DNA-based cryptography becomes an emerging interdisciplinary research field. In this paper, we present a novel DNA cryptography that takes advantage of DNA self-assembled structure. Making use of the toehold strands recognition and strand displacement, the bit-wise exclusive-or (XOR) operation is carried out to fulfill the information encryption and decryption in the form of a one-time-pad. The security of this system mainly comes from the physical isolation and specificity of DNA molecules. The system is constructed by using complex DNA self-assembly, in which technique of fluorescent detection is utilized to implement the signal processing. In the proposed DNA cryptography, the XOR operation at each bit is carried out individually, thus the encryption and decryption process could be conducted in a massive, parallel way. This work may demonstrate that DNA cryptography has the great potential applications in the field of information security.

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Characterization of char gasification in a micro fluidized bed reaction analyzer

Characterization of char gasification in a micro fluidized b...

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作者： Zeng, Xi Wang, Fang Wang, Yonggang Li, Aoming Yu, Jian Xu, Guangwen State Key Laboratory of Multi-phase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemical and Environmental Engineering China University of Mining and Technology Beijing 100083 China Shanghai Amtek Industrial Equipment Limited Company Shanghai 200131 China

This study is devoted to characterizing the isothermal reaction kinetics of char gasification with CO2 in a micro fluidized bed reaction analyzer (MFBRA) in comparison to the measurement in a thermogravimetric analyzer (TGA). Under minimized inhibition of heat and mass transfer, the reaction rate was found to be much higher in the MFBRA than in the TGA. The maximal rate appeared at a conversion of about 0.15 in the MFBRA but at 0.45 in the TGA. The shrinking core model described well the char-CO2 gasification reaction in both the MFBRA and TGA. In the temperature range of 760-1000 C, the char-CO2 gasification reaction can be divided into two stages. At lower temperatures, the activation energy from the MFBRA and TGA is very close, validating the reliability of the MFBRA for analyzing gas-solid reaction kinetics. At higher temperatures, the estimated activation energy was obviously higher for the MFBRA than for the TGA, showing the lower diffusion limitation prevailing in the MFBRA. The frequency factor for the Arrhenius equation was found to be much higher for the MFBRA than for the TGA, complying with the higher reaction rate observed in the MFBRA. The variation in the reaction atmosphere composition during gas switching in the TGA was also investigated. © 2014 American Chemical Society.

关键词： Fluidized beds

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Stability Analysis of Nonlinear Self-excited Vibration in Cold Rolling Main Drive system

Stability Analysis of Nonlinear Self-excited Vibration in Co...

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第26届中国控制与决策会议

作者： Yang Xu Li Qing Peng Kaixiang Tong Chaonan Ding Dawei Key Laboratory of Advanced Control of Iron and Steel Process School of Automation and Electrical EngineeringUniversity of Science and Technology Beijing State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University

A nonlinear self-excited vibration model of main drive system in cold rolling is established. The mechanism of torsional vibration in main drive system stability is discussed within multiple scale method as well as Hopf bifurcation theorem. Then, the periodic solutions and condition of Hopf bifurcation are derived and the influence by subcritical/supercritical bifurcation is analyzed. Based on the simulation experiments with actual industrial data, the previous theoretical analysis and nonlinear model have been testified.

关键词： Nonlinear Modeling,Self-excited Vibration,Stability Analysis,Main Drive system,Cold Rolling process

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Data driven state detection algorithm for ash deposition detection

Data driven state detection algorithm for ash deposition det...

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2013 18th International Conference on Methods and Models in Automation and Robotics, MMAR 2013

作者： Liu, Jiwei Liu, Jizhen Deliang, Zeng Chang, Taihua Key Laboratory of Measurement and Control New Technology and System for Industrial Process North China Electric Power University Beijing China

ISBN: (纸本)9781467355063

A data driven state detection algorithm was proposed to improve the security and reliability of equipment. The algorithm is used for one class of objects whose state parameters change slowly and cumulatively in the long term. The concepts of multi-scale system, multi-scale entropy and multi-scale exergy were used to describe these processes. With the help of the algorithm, an ash deposition index for the radiant heating surface of a 600 MW unit was constructed to monitor the states of the instruments. Noise was analyzed. The results of simulation experiments demonstrate the effectiveness of the algorithm, which can provide a technical basis for condition maintenance. © 2013 West Pomeranian University of technology.

关键词： Exergy

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