检索结果-内蒙古大学图书馆

Global properties of the triangular systems in the singular case

JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS 2008年第2期342卷 1426-1439页

作者： Korobov, V. I. Pavlichkov, S. S. Kharkov Natl Univ Dept Math Anal UA-61077 Kharkov Ukraine Kharkov Natl Univ Dept Differential Equat & Control UA-61077 Kharkov Ukraine Univ Szczecin Inst Math PL-70451 Szczecin Poland

We introduce a new class of the triangular (multi-input and multi-output) control systems, of O.D.E., which are not feedback linearizable, and investigate its global behavior. The triangular form introduced is a generalization of the classes of triangular systems, considered before. For our class, we solve the problem of global robust controllability. Combining our main result with that of [F.H. Clarke, Yu.S. Ledyaev, E.D. Sontag, A.I. Subbotin, Asymptotic controllability implies feedback stabilization, IEEE Trans. Automat. control 42 (1997) 1394-1407], we obtain a corollary on the global discontinuous sampled stabilization (an example showing that global smooth stabilization can be irrelevant to the singular case is considered). To prove our main result, we apply a certain "back-stepping" algorithm and combine the technique proposed in [VI. Korobov, S.S. Pavlichkov, W.H. Schmidt, Global robust controllability of the triangular integro-differential Volterra systems, J. Math. Anal. Appl. 309 (2005) 743-760] with solving a specific problem of global "practical stabilization" by means of a discontinuous, time-varying feedback law. (C) 2008 Elsevier Inc. All rights reserved.

关键词： nonlinear robust control triangular form global controllability feedback linearization

来源：评论

学校读者我要写书评

暂无评论

Experimental evaluation of NR-PSS for large synchronous generators

引用

3rd International Conference on Electric Utility Deregulation, Restructuring and Power Technologies

作者： Zheng, Shaoming Mei, Shengwei Wang, Peng Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China

ISBN: (纸本)9787564112493

A novel nonlinear robust power system stabilizer (NR-PSS) for large synchronous generators is developed based on nonlinear robust control theory. The nonlinear model of NR-PSS is established on the basis of multi-machine systems, which considers the transient salient effect of generators and kinds of disturbances in the system. Furthermore, an intelligent and digital industrial NR-PSS equipment is also developed. A new method for NR-PSS parameter setting which is based on the widely used frequency domain test for conventional PSS is also put forward. The dynamic simulation experiments are conducted to verify the effectiveness of NR-PSS comparing that with classical PSS. The results demonstrate the proposed NR-PSS can attenuate the oscillation of active power much faster and notably improve the generator damping, but also enhance the transient stability of the system and increase the stability limit significantly when subjected to large disturbances.

关键词： dynamic simulation experiment large synchronous generators nonlinear robust control power system stabilizer

来源：评论

学校读者我要写书评

暂无评论

Experimental evaluation of nonlinear robust control for SMES to improve the transient stability of power systems

引用

IEEE TRANSACTIONS ON ENERGY CONVERSION 2004年第4期19卷 774-782页

作者： Liu, F Mei, SW Xia, DM Ma, YJ Jiang, XH Lu, Q Tsinghua Univ Dept Elect Beijing 100084 Peoples R China

This paper presents a new approach and corresponding experiments for the nonlinear robust control of a superconducting magnetic energy storage (SMES) unit to improve the transient stability of power systems. Based on the result of SMES prototype experience, a new dynamic model with disturbances of SMES is adopted, and transferred to the per unit system for simplifying the dynamic analysis and controller design. Then, feedback linearization scheme and linear H-infinity control theory are applied to design a novel SMES nonlinear robust controller in a one-machine infinite bus (OMIB) power system. In order to confirm such positive effects of the proposed control strategy, experiments are carried on a laboratory setup of SMES comparing that with a conventional proportional-integral (PI) controller. The results of experiments demonstrate that the proposed nonlinear robust controller has more excellent performance to improve the transient stability of power systems than that of conventional PI controllers.

关键词： nonlinear robust control power system control power system transient stability superconducting magnetic energy storage (SMES)

来源：评论

学校读者我要写书评

暂无评论

robust full degree-of-freedom tracking control of a helicopter

引用

AUTOMATICA 2007年第11期43卷 1909-1920页

作者： Marconi, Lorenzo Naldi, Roberto Univ Bologna Dept Elect Comp & Syst Sci DEIS Ctr Res Complex Automates Syst G Evangelisti CASY I-40126 Bologna Italy

We consider the problem of controlling the vertical, lateral, longitudinal and yaw attitude motion of a helicopter along desired arbitrary trajectories with only restrictions on the time derivatives imposed by the functional controllability of the system. To this purpose we design a nonlinear controller, obtained by suitably combining feedforward control actions and high-gain and nested saturation feedback laws, which succeeds in enforcing the desired trajectories robustly with respect to uncertainties characterizing the physical and aerodynamical parameters of the helicopter. Experimental results are also given to show the effectiveness of the method to accomplish aggressive maneuvers. (C) 2007 Elsevier Ltd. All rights reserved.

关键词： helicopter nonlinear robust control dynamic inversion saturation functions high-gain feedback

来源：评论

学校读者我要写书评

暂无评论

Decentralized nonlinear robust control of UAVs in close formation

引用

INTERNATIONAL JOURNAL OF robust AND nonlinear control 2003年第11期13卷 1057-1078页

作者： Singh, SN Zhang, R Chandler, P Banda, S Univ Nevada Dept Elect & Comp Engn Las Vegas NV 89154 USA USAF Res Lab VACA Wright Patterson AFB OH 45433 USA

This paper treats the design of a decentralized nonlinear robust control system for formation flying of multiple unmanned aerial vehicles (UAVs). In close formation, it is assumed that vortex of any UAV affects the motion of all the UAVs behind it. The forces produced by these vortices are complex functions of relative position co-ordinates of the UAVs. In this paper, these forces are treated as unknown functions, which cannot be parameterized. Since the system is not invertible in the wind axes system, a simplified coordinate system obtained from the wind axes system for which the velocity roll (bank angle) is zero, is considered for the design of the control system. A nonlinear robust control system for the separation trajectory control of the wing aircraft in the simplified wind coordinate system is derived. Uncertain functions and unmeasured variables are estimated using a high-gain observer for the synthesis of the control system. Each wing UAV synthesizes its control law using its own state variables and the relative position of the preceding UAV with respect to the wing UAV. Thus the control system is decentralized since each UAV has to communicate (depending on sensors for position measurement) with at most one (preceding) UAV, and no data transmission from the remaining vehicles is required. Simulation results for two UAVs are presented which show precise separation trajectory control of each wing UAV in spite of the presence of unknown and unstructured vortex forces, while the lead aircraft maneuvers. Furthermore, these results confirm that when the wing aircraft is positioned properly in the vortex of the lead aircraft, it experiences reduction in its required flight power. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： control of UAVs formation flying nonlinear robust control decentralized control

来源：评论

学校读者我要写书评

暂无评论

Simplified robust control for nonlinear uncertain systems: a method of projection and online estimation

引用

AUTOMATICA 2005年第6期41卷 1079-1084页

作者： Saengdeejing, A Qu, ZH Univ Cent Florida Orlando FL 32816 USA Automated Imaging Syst Inc Orlando FL 32816 USA

robust control based on an online estimation of uncertainty is presented for a class of nonlinear uncertain systems. The estimation is done via a robust observer after the uncertainty vector is projected onto a one-dimensional subspace. The proposed combination of dynamics projection and online estimation is to relax the knowledge about the size of uncertainty and required in the robust control design, to make robust control less conservative while being effective, and to ensure robust stability without undue complexity. (c) 2005 Elsevier Ltd. All rights reserved.

关键词： nonlinear robust control subspace projection uncertainty estimation

来源：评论

学校读者我要写书评

暂无评论

Simplified robust control for nonlinear uncertain systems: a method of projection and online estimation

Simplified robust control for nonlinear uncertain systems: a...

引用

20th Annual American control Conference (ACC)

作者： Saengdeejing, A Qu, ZH Univ Cent Florida Orlando FL 32816 USA Automated Imaging Syst Inc Orlando FL 32816 USA

ISBN: (纸本)0780372980

关键词： nonlinear robust control subspace projection uncertainty estimation

来源：评论

学校读者我要写书评

暂无评论

robust control of a gas turbine with variable power offtake

Robust control of a gas turbine with variable power offtake

引用

51st ASME Turbo Expo

作者： Mahmood, Shahid Griffin, Ian A. Fleming, Peter J. Univ Sheffield Dept ACSE Sheffield S Yorkshire England

ISBN: (纸本)0791842371

The conventional approach to Rolls-Royce Inverse Model closed loop fuel control is to represent the inverse high-pressure (HP) spool dynamics within the controller. In this paper, the options of configuring the controller to represent either the intermediate (IP) or the low pressure (LP) dynamics of a 3-spool engine are also analysed. control performance is assessed as the engine is subjected to step changes in power offtake. For each controller, power offtake is extracted from each of the three shafts in turn giving a total of 9 engine/controller configurations. For any given power offtake configuration applied to the engine, the results suggest that the controller based upon LP or IP dynamics offers more robustness measured in terms of phase margins and improved performance with regard to power offtake disturbance rejection.

关键词： nonlinear robust control inverse dynamics GTE power offtake

来源：评论

学校读者我要写书评

暂无评论

Recursive design of nonlinear disturbance attenuation control for STATCOM

引用

INTERNATIONAL JOURNAL OF control AUTOMATION AND SYSTEMS 2005年第2期3卷 262-269页

作者： Liu, F Mei, SW Lu, Q Goto, M Inst Syst Sci Beijing 100080 Peoples R China Tsing Hua Univ Dept Elect Engn Beijing 100084 Peoples R China

In this paper, a nonlinear robust control approach is applied to design a controller for the Static Synchronous Compensator (STATCOM). A robust control dynamic model of STATCOM in a one-machine, infinite-bus system is established with consideration of the torque disturbance acting on the rotating shaft of the generator set and the disturbance to the output voltage of STATCOM. A novel recursive approach is utilized to construct the energy storage function of the system such that the solution to the disturbance attenuation control problem is acquired, which avoids the difficulty involved in solving the Hamilton-Jacobi-Issacs (HJI) inequality. Sequentially, the nonlinear disturbance attenuation control strategy of STATCOM is obtained. Simulation results demonstrate that STATCOM with the proposed controller can more effectively improve the voltage stability, damp the oscillation, and enhance the transient stability of power systems compared to the conventional PI+PSS controller.

关键词： disturbance attenuation nonlinear robust control recursive design STATCOM

来源：评论

学校读者我要写书评

暂无评论

Power system transient stability enhancement by STATCOM with nonlinear H_∞ stabilizer

引用

ELECTRIC POWER SYSTEMS RESEARCH 2005年第1期73卷 45-52页

作者： Al-Baiyat, SA King Fahd Univ Petr & Minerals Dept Elect Engn Dhahran 31261 Saudi Arabia

A robust control design is presented for a single machine infinite bus system (SMIB) with a STATCOM. The controller for the nonlinear H-infinity system is designed using the recently developed nonlinear H-infinity theory. The approach combines state feedback exact linearization with linear H-infinity principle, which avoids the difficulty of solving Hamilton-Jacoby-Issacs inequality Simulation results with a number of disturbances like torque pulses and three-phase faults on the generator show that the proposed robust controller can ensure transient stability of the power system over a wide range of operating points. (C) 2004 Elsevier B.V. All rights reserved.

关键词： Statcom nonlinear robust control H-infinity control global stabilization power systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：