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Study on the method of restraining the ending effect of empirical mode decomposition (EMD)

Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology 2006年第3期26卷 196-200页

作者： Xu, Bao-Jie Zhang, Jian-Min Xu, Xiaoli Li, Jian-Wei School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing 100081 China Measurement and Control of Mechanical and Electrical System Key Lab. of Beijing Beijing Institute of Machinery Beijing 100085 China

Ending effect is produced in the decomposition process of empirical mode decomposition (EMD) based Hilbert-Huang transformation. It leads to distortion near the two end points of the signal processed. Several methods of restraint aimed at ending effect are proposed. Comparison has been made among the global average statistic method, the parallel line extending method, the polynomial curvefitting method, the mirror extending method and the neural networks extending method. As a result of simulation and experiment, it is shown that ending effect can be effectively restrained.

关键词： Signal theory

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Reliability Assessment of Generation and Transmission systems Considering Multi-Form Access of "Source-Network-Load-Storage"

Reliability Assessment of Generation and Transmission System...

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Sustainable Power and Energy Conference (iSPEC)

作者： Ning Qi Lin Cheng Yi Jiang Jinshan Luo Ke Sun Dan Wang Liang Cheng Quanquan Wang State Key Lab. of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Grid Economic and Technological Research Institute Co. Ltd. Beijing China State Grid Jiangsu Electric Power Co. LTD. State Grid Jiangsu Economic Research Institute Jiangsu China

ISBN: (纸本)9781728149318

Reliability assessment is the key to ensure the security of power system, however, the rapid development of “source-network-load-storage” cause enormous obstacle to the traditional reliability method. A improved method for reliability assessment of generation and transmission systems is proposed in this paper which lays importance on the coordinate operation and uncertainty of “source-network-load-storage”. Firstly, the reliability and operation model of “source-network-load-storage” is proposed to handle certain novel elements. Then the reliability assessment with operation simulation is proposed to make balance between generation and load under uncertainty. Finally, numerical analysis focusing on the different form and proportion of “source-network-load-storage” is tested in IEEE RTS-79 system so as to demonstrate the practicality and effectiveness of the improved method.

关键词： reliability assessment renewable energy energy storage operation simulation generation and transmission system reliability evaluation energy storage Renewable energy Generation and Transmission Transmission systems Power system security

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Sensitivity analysis for AC/DC hybrid power systems

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Dianli Xitong Zidonghua/Automation of Electric Power systems 2007年第12期31卷 45-49页

作者： Liu, Chongru Zhang, Boming Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China State Key Lab. of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China

The interactions between AC and DC systems in the steady-state condition of power systems are investigated. Through a sensitivity analysis, the influence of DC control parameters on the operation of AC/DC systems and that of AC control parameters on other AC parameters with the DC system existing are discussed. The sensitivity matrices and the influence factors between AC and DC systems are analyzed from various points of view. The sensitivity analysis made in this paper is expected to be of practical significance in such problems as load flow control, parameter regulation, voltage estimation, etc.

关键词： Electric power transmission networks

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Novel algorithm for communication signal blind separation-EASIBSA algorithm

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology 2008年第1期30卷 91-94页

作者： Fu, Wei-Hong Yang, Xiao-Niu Liu, Nai-An Zeng, Xing-Wen State Key Lab. of Integrated Service Networks Xidian University Xi'an 710071 China National Laboratory of Information Control Technology for Communication System Jiangnan Electronic Communications Research Institute Jiaxing 314033 China

Aim at the problem of the communication signal blind source separation, a novel blind separation algorithm based on step size adaptation (EASIBSA) to increase the convergence rate of the separation algorithm was present by using the idea of parameter adaptation optimization, which was based on Equivariant Adaptive Separation via Independent (EASI) algorithm. This algorithm related the learning rate with the object function and adapted it by using the stochastic gradient method, which avoided the selection of optimum learning rate and speed up the convergence rate. Simulation results showed that improved algorithm could increase the convergence rate of separation algorithm by two times without affecting the separation capability.

关键词： Blind source separation Convergence rate Digital communication Parameter adaptation

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Study on Modelling of a DC Coaxial Motor in Marine Applications

Study on Modelling of a DC Coaxial Motor in Marine Applicati...

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International Conference on system Science and Engineering (ICSSE)

作者： Nguyen Duc Thinh Duong Ngoc Quan Nguyen Tan Tien Do Xuan Phu Department of Electrical Engineering and Information Technology Vietnamese-German University Binh Duong Vietnam Institute of Engineering HUTECH University of Technology Ho Chi Minh city Vietnam National Key Laboratory of Digital Control and System Engineering Ho Chi Minh University of Technology Ho Chi Minh city Vietnam MediRobotic Lab. Vietnamese-German University Binh Duong Vietnam

The main goal of this paper studies modeling of a direct current coaxial motor (DCCM) and testing the main parameters of DCCM on the experimental model. The DCCM contains two rotors named inner runner and outer runner. The inner runner and the outer runner rotate in opposite directions to each other. The shaft of the inner runner and the shaft of the outer runner are coincident and inserted on two separate bearings. To prove this idea, the mathematic model is achieved by a combination of a mathematic model of DC motor and mathematic model of single phase coaxial motor. Simulation result of the mathematic model in Matlab.shows the truth of the hypothesis of the design. The result of testing DCCM of the experimental model is fit to the result of simulation of DCCM in Matlab. Consequently, the DCCM can substitute for other kinds of propellers especially in marine applications.

关键词： DC motors Mathematical model Shafts Torque measurement Induction motors Torque

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Corrigendum to “Influence of Na doping on the magnetic properties of LaFeO 3 powders and dielectric properties of LaFeO 3 ceramics prepared by citric sol-gel method” [Ceram. Int. 43 (2017) 7922–7928]

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Ceramics International 2017年第18期43卷 17247-17247页

作者： Ensi Cao Yanrong Qin Tingting Cui Li Sun Wentao Hao Yongjia Zhang Key Lab. of Advanced Transducers & Intelligent Control System College of Physics & Optoelectronics Taiyuan University of Technology Taiyuan 030024 People's Republic of China

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Novel decentralized approach through optimal resource allocation for congestion management

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2006年第22期26卷 46-53页

作者： Liu, Kai Zhao, Da-Pu Hou, Yun-He Bi, Tian-Shu Ni, Yi-Xin Wu, Felix Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong Hong Kong Department of Electric Engineering Tsinghua University Beijing 100084 China Key Power System Lab. Shenzhen Research Institute Shenzhen 518055 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

The paper proposed a novel decentralized approach for congestion management via Optimal Resource Allocation (ORA) for the forward markets. The availab.e capacities of possible congested transmission lines are considered as commonly shared resources for bilateral and multilateral transactions in the market. Each transaction maximizes its profit using limited capacity of transmission line allocated by the ISO. Through the proposed decentralized optimization algorithms, the ISO searches the optimal allocation of the capacities of congested transmission lines to the individual transactions and finally the same market efficiency (social welfare) as centralized optimization is achieved. This decentralized approach is more suitable for power market environment since it does not require private and sensitive information submission from individual transactions to the ISO and the resource allocation decision is always feasible during iterations. The mathematical model, calculation procedure and relevant proof are presented. The computer test results from the IEEE 30 bus system show clearly the effectiveness of the approach and its consistency with the centralized optimization.

关键词： Resource allocation

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A comparative study on D converter based on control schemes of maximum extracted power

A comparative study on D converter based on control schemes ...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Ahmad El Khateb M.N. Uddin N. A. Rahim Barry W. Williams Automatic Control and Human-Machine Systems LAMIH UMR/CNRS Valenciennes France Electronic Engineering Department Tsinghua University Tsinghua National Laboratory for Information Science and Technology (TNList) Beijing P. R. China Shenzhen City Key Laboratory of Digital TV System Valeo Powertrain Systems Amiens France National Engineering Lab. for DTV(Beijing) Beijing P. R. China

ISBN: (纸本)9781479983988

This paper presents analysis and control of D converter, which has continuous input and output current to obtain maximum power transfer from a photovoltaic (PV) system. Examining the maximum power involves optimization and control techniques that ensure maximum power extraction enhancement. Traditional converters have rather high input ripple current that originates considerable loss of power extraction when linked to photovoltaic panels. Operating with zero input ripple current enlarges the power obtained from the PV panel without employing electrolytic capacitor. Experiment and simulation of the converter performance support and extol the system concept and establish a balanced view among several types of used controllers as well.

关键词： Inverters Capacitors Photovoltaic systems Radiation effects control systems Fuel cells

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Improved pitch angle control for variable-speed wind turbine system

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International Conference on Advanced Engineering Theory and Applications 2013, AETA 2013

作者： Van, Tan Luong Nguyen, Buu Pham Nhat Tan Truong, Trung Hieu Trang, Tran Thanh Department of Electrical Engineering Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Power System Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electrical-Mechanical Engineering Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electronics and Telecommunication Engineering Van Hien University 665-667-669 Dien Bien Phu District 3 Ho Chi Minh City Viet Nam National Key Lab. of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet District 10 Ho Chi Minh City Viet Nam

ISBN: (纸本)9783642419676

In this paper, a pitch angle control scheme based on the fuzzy logic is proposed for the variable-speed wind turbine systems. The generator output power and rotor speed are used as control input variables for the fuzzy logic controller (FLC), which are effective to compensate for the nonlinear characteristic of the pitch angle to the wind speed. Also, a speed sensorless technique estimating the rotational speed is employed for the proposed control method. The effectiveness of the proposed method is verified by MATlab.simulation results for a 2-MW PMSG wind turbine system. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Fuzzy logic

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Nonlinear control of PMSG wind turbine systems

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International Conference on Advanced Engineering Theory and Applications 2013, AETA 2013

作者： Van, Tan Luong Truong, Trung Hieu Nguyen, Buu Pham Nhat Tan Trang, Tran Thanh Department of Basics Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electrical-Mechanical Engineering Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Power System Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electronics and Telecommunication Engineering Van Hien University 665-667-669 Dien Bien Phu District 3 Ho Chi Minh City Viet Nam National Key Lab. of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet District 10 Ho Chi Minh City Viet Nam

ISBN: (纸本)9783642419676

This paper proposes a control scheme for the permanent magnet synchronous generator (PMSG) wind power system. The DC-link voltage can be controlled at the machine-side converter (MSC), while the grid-side converter (GSC) controls the grid active power for a maximum power point tracking (MPPT). At the grid fault condition, the DC-link voltage controller is designed using a feedback linearization (FL) theory. For the MPPT, it is also developed for the PMSG wind turbines to continuously generate the maximum electrical power without any sensor. The validity of this control algorithm has been verified by simulation 2-MW PMSG wind turbine system. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Feedback linearization

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