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Design MIMO control systems with Non-Gaussian delays and noises

ICIC Express Letters 2013年第2期7卷 417-422页

作者： Zhang, Jianhua Ren, Mifeng Hou, Guolian Yu, Mei School of Control and Computer Engineering No. 2 Beinong Road Huilongguan Changping District Beijing 102206 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University No. 2 Beinong Road Huilongguan Changping District Beijing 102206 China

A novel control algorithm for multi-input-multi-output (MIMO) dynamic stochastic systems is developed. The system is expressed by a nonlinear ARMAX model with non-Gaussian noises and random delays. An improved minimum error entropy (MEE) criterion, instead of conventional mean square error, is used to design the adaptive controller. In order to obtain the performance index of the closed-loop control system, the probability density functions (PDFs) of tracking error are estimated by Modha's density estimator, which is implemented by a multi-layer perceptron (MLP). The convergence condition of the proposed control algorithm is analyzed. Finally, a simulation example is given to illustrate the efficiency and feasibility of the proposed approach. © 2013 ISSN 1881-803X.

关键词： Closed loop control systems

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Analysis of Excitation Characteristics of Ultra High Frequency Electromagnetic Waves Induced by PD in GIS

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高电压技术 2013年第8期39卷 1893-1901页

作者： DING Dengwei GAO Wensheng YAO Senjing LIU Weidong HE Jiaxi Sichuan Electric Power Research Institute Chengdu 610072 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Shenzhen Power Supply Co. Ltd Shenzhen 518001 China

The understanding of the excitation mechanism of ultra high frequency (UHF) electromagnetic waves (EW) is essential for ap- plying UHF method to partial discharge (PD) detection. Since the EW induced by PD in gas insulated switchgear (GIS) contains not only transverse electromagnetic (TEM) wave, but also high-order transverse electric (TE) and high-order transverse magnetic (TM) waves, we analyzed the proportions between the TEM wave and the high order waves, as well as the influence of the PD position on this proportion, using the finite different time domain (FDTD) method. According to the unique characteristics of the waves, they are separated only ap- proximately. It is found that the high-order mode is the main component, more than 70%, of the electric field around the enclosure of GIS, and that with the increasing distance between PD source and inner conductors, the low frequency ( below about 800 MHz) component of EW decreases, but the high frequency component (above 1 GHz) increases, meanwhile the proportion of high-order components in EW could reach 77% from 70%. It concluded that the closer the PD source to the enclosure is, the easier high order EW may be excited.

关键词：超高频电磁波励磁特性 GIS PD 诱导气体绝缘开关设备 UHF方法 TEM波

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An extension of distributed dynamic description logics for the representation of heterogeneous mappings

Journal of Software

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Journal of Software 2013年第1期8卷 243-250页

作者： Wang, Zhuxiao Guo, Jing Chen, Fei Wu, Kehe Wang, Peng School of Control and Computer Engineering State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University 102206 Beijing China National Computer Network Emergency Response Technical Team Coordination Center of China 100029 Beijing China School of Control and Computer Engineering North China Electric Power University 102206 Beijing China Institute of Information Engineering Chinese Academy of Sciences 100195 Beijing China

As a family of dynamic description logics, DDL(X) is constructed by embracing actions into the description logic X, where X represents well-studied description logics ranging from the ALC to the SHOIQ. To efficiently support automated interoperability between ontology-based information systems in distributed environments, we have to design an expressive mapping language to semantically understand resources from remote and heterogeneous systems. Distributed Dynamic Description Logics D3L(X) is a natural generalization of the DDL(X) framework, which is designed to model the distributed dynamically-changing knowledge repositories interconnected by semantic mappings and to accomplish reasoning in distributed, heterogeneous environments. In this paper, we propose an extension of Distributed Dynamic Description Logics D3L(X) and investigate the reasoning mechanisms in D3L(X). © 2013 ACADEMY PUBLISHER.

关键词： Interoperability

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Numerical Analysis of Space Charge Characteristics in Low-density Polyethylene Nanocomposite under External DC Electric Field

Numerical Analysis of Space Charge Characteristics in Low-de...

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中国物理学会第十八届全国静电学术会议

作者： ZHOU Yuanxiang ZHANG Ling SHA Yanchao TIAN Jihuan State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University ABB (China) Limited Universal

In this work, we are interested in space charge dynamics characteristics in the low-density polyethylene(LDPE) nanocomposite mixed with some mass fraction of inorganic nanofillers. Different with all previous qualitatively theoretical works, numerical simulation based on the bipolar charge transport model was performed to systematically investigate the influence of trap depth, trap concentration, and injection barrier height on the space charge and electric field distributions under DC external electric field of 100 k V/mm. Our simulation results showed that increasing the trap depth would severely distort the electric field distribution at the balanced status with the highest and lowest electric field of 119 k V/mm and 47 k V/mm, respectively. Due to the introduction of nanofillers, more deep traps were created and blocked the space charge movement, capturing most of space charge in the vicinity of the electrode and largely declining the local electric field further. In addition, our theoretical analysis also showed both the high permittivity and low local electric field contributed to the increase of injection barrier height. Once the injection barrier height surpassed 1.25 e V, there was almost no charge that could overcome the injection barrier. At last, a mechanism of space charge suppression in the LDPE nanocomposite was presented.

关键词： LDPE nanocomposite space charge bipolar charge transport model trap depth Schottkyinjection barrier height

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On dispatching power systems with significant wind generation using disturbance feedbacks

On dispatching power systems with significant wind generatio...

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Chinese control Conference (CCC)

作者： Wei Wei Shengwei Mei Feng Liu State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing Beijing CN

With the rapid development of renewable energies, especially wind power, how to manage unexpected generation variations economically and reliably in dispatch has become crucial for modern power systems. To address this issue, this paper presents an affine disturbance feedback robust dispatch (ADF-RD) methodology for power systems with large scale wind power integration in the framework of adjustable robust optimization (ARO). This methodology divides the dispatching process into pre-dispatch and re-dispatch. Pre-dispatch decision immunizes against all possible realizations of uncertainties in a set, while re-dispatch which can be regarded as a feedback will be adaptively adjusted using an affine function with respect to the realized uncertainty in real time. The ADF-RD methodology is applied to an hourly ahead dispatch (HAD) problem. The effectiveness and efficiency of the proposed ADF-RD methodology are demonstrated by numerical experiments carried on a five-bus system.

关键词： Uncertainty Wind power generation Wind forecasting Wind farms Load flow power transmission lines

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Research on platform for advanced control of energy storage system

Research on platform for advanced control of energy storage ...

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2nd IET Renewable power Generation Conference (RPG 2013)

作者： Hanchen Xu Zhichang Yuan Chao Lu Can Wang Haifeng Guo Yongxing Li State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing 100084 China China Southern Power Grid Power Generation Company Guangzhou 510630 China

Advanced applications of energy storage system comprise load shifting, isolated island operation, frequency regulation and reactive support, etc. There are already algorithms and control strategies for advanced applications, but still lack an independent supporting software platform. This paper concentrates on the structure and realization of software platform for advanced application of large-scale energy storage system, including demand analysis, software architecture and module design, user interface and functionality development. An easy to operate and expand software platform, with a beautiful graphical user interface and support for visualization of data, was designed and implemented.

关键词：

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Automatic voltage control for ultra-high voltage AC neighboring grids

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Dianli Xitong Zidonghua/Automation of Electric power systems 2013年第21期37卷 99-105页

作者： Wang, Bin Guo, Qinglai Sun, Hongbin Tang, Lei Zhang, Boming Wu, Wenchuan Department of Electrical Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing 100084 China

The connection of ultra-high voltage (UHV) transmission line has brought a challenge to the voltage operation and control of its neighboring power system. Facing engineering practice, this paper proposes an automatic voltage control (AVC) method for the UHV neighboring grids. The reactive voltage operation and control characteristics of UHV neighboring grids are analyzed, including the tremendous impact of UHV active power flow change on the bus voltage in UHV neighboring grids, the large voltage fluctuation, and the tight coupling among power plants and substations, etc. The smart voltage optimal control technology is proposed and implemented by taking into consideration these characteristics and the coordinated control among tightly coupled power plants and substations in the UHV neighboring grids. This method can reduce the irrational reactive power flow and bypass the unnecessary discrete device action, while ensuring voltage security. The proposed method is put into closed-loop field operation in China for its validated efficiency and practicability. ©2013 state Grid Electric power Research Institute Press.

关键词： Smart power grids

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Full-state Feedback Linearization and Backstepping control of Nonlinear Markovian Jump systems

Full-State Feedback Linearization and Backstepping Control o...

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第三十二届中国控制会议

作者： Zhongwei Lin Jizhen Liu Yuguang Niu Wei Wang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer EngineeringNorth China Electric Power University

ISBN: (纸本)9781479900305

This paper investigates the full-state feedback lineaxization and backstepping control design problems for a class of nonlinear Markovian jump *** to the proposed relative degree set definition,the system can be transformed into the canonical form through the appropriate coordinate changes following with the Markovian switchings,i.e.,the system can be full-state feedback linearized in every jnmp mode with respect to the relative degree set {n,...,n}.Then,a stabilizing control is designed through applying the backstepping technique,which guarantees the asymptotically stability of nonlinear Markovian jump systems.

关键词： Markovian jump system Nonlinear system Stabilization Backstepping control

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An Adaptive Linear Element Based Method for Identification of Linear Parameter Varying Models

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IFAC Proceedings Volumes 2013年第20期46卷 309-314页

作者： Fei Ye Yong Sun Qinmin Yang State Key Laboratory of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China Zhejiang Windey Co. Ltd and the State Key Laboratory of Wind Power System Zhejiang Hangzhou 310012 China

This paper is concerned with the identification of nonlinear processes which are parameterized as linear parameter varying (LPV) models. The LPV models are represented as blended linear models by using ADAptive LINear Element (ADALINE) structure. Firstly, ADALINE is employed to represent local models describing the system's behaviour at each fixed working point. Then, a novel method is proposed to estimate parameters of weight functions such that the global LPV model can be built by interpolating the local ones. The adaptation algorithm is discussed and extensive simulation studies are conducted to verify the effectiveness of this method.

关键词： system identification LPV models ADALINE Input/output Weight functions

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Risk evaluation method of electric power communication network

Risk evaluation method of electric power communication netwo...

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International Conference on Natural Computation (ICNC)

作者： Kangming Jiang Ying Zeng Boren Deng Liangrui Tang Power dispatch and control Center of Guangdong Power Grid Corp Guangzhou China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

ISBN: (纸本)9781467347129

For the monotony of the traditional risk evaluation method of electric power communication network, a comprehensive method for evaluating risk of electric power communication network is provided. Starting from the analysis of the operational services, risk status of each link in the network is obtained. Then the link weights are calculated by means of analyzing the importance of link to network from the perspective of topology. Lastly, two risk evaluation indicators which are network risk and degree of risk balancing of network can be calculated by combining link risk and link weight. The comprehensive method for evaluating risk of electric power communication network is more comprehensive and ocular in the analysis of operational risks and risk distribution, and has practical significance and extensive application prospects in risk management.

关键词： Communication networks Security Network topology Topology power system reliability Reliability

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