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Nonlinear decouple controller design for wind power generator under ride-through

Nonlinear decouple controller design for wind power generato...

引用

8th International Power engineering Conference, IPEC 2007

作者： Zhishan, Liang Zhengxian, Xie Huaguang, Zhang Faculty of Mechanical and Electronic Enginnering China University Petroleum 102249 Hong Kong School of Information Science and Engineering Northeastern University Shenyang 110004 China

ISBN: (纸本)9789810594237

Doubly-Fed Induction Generator(DFIG) based wind turbines has been used widely in variable speed and constant frequency wind energy generation system, but they are highly susceptible to any disturbances, such as faults, grid voltage sag or swell. In this paper, nonlinear control theory is used to handle couple between electrical and mechanical models in order to obtain nonlinear optimal control law and further implement three pairs decouple control structure. The technical works include: a new fourth-order control model of DFIG is derived;a novel nonlinear optimal control strategy based on input-output state feedback linearization theory for wind turbines with DFIG is presented;the simulation study and the test of low power hardware prototype of the proposed control scheme are carried out and partial results are presented. Results show the validity and efficiency of the proposed control strategy to improve the ride-through capability. © 2007 RPS.

关键词： Wind turbines

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New synthesis design of adaptive back-stepping controller for static SVC 9

New synthesis design of adaptive back-stepping controller fo...

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2007 9th European Control Conference, ECC 2007

作者： Fu, Jun Kolemisevska-Gugulovska, Tatyana D. Dimirovski, Georgi M. Zhao, Jun Northeastern University Faculty of Information Science and Engineering Shenyang110004 China SS Cyril and Methodius University Faculty of Electrical Engineering Karpos 2 SkopjeMK-1000 Macedonia Dogus University Department of Computer Engineering Acibadem Kadikoy IstanbulTR-34722 Turkey

ISBN: (纸本)9783952417386

A new synthesis design for nonlinear adaptive control of Static VAR Compensator for a single-machine infinite-bus system with SVC is derived and proved. The proposed method differs from the 'traditional' adaptive back-stepping in both ways how the parameter estimator is constructed and the nonlinear gains are assigned. In comparison with the existing traditional adaptive back-stepping controller, the proposed approach does not follow the classical certainty-equivalence philosophy for the first time, thus yielding the novel parameter estimator and feedback controller dynamics in dealing with unknown parameters. Computer simulation experiments demonstrated that the proposed approach is considerably superior to the control synthesis based on 'classical' adaptive back-stepping in terms of the properties of stability and parameter estimation. Results show that the proposed design almost completely recovers the performance of the 'full-information' controller. © 2007 EUCA.

关键词： Parameter estimation

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Discrete-Time Sliding Mode Control of Nonlinear Systems

Discrete-Time Sliding Mode Control of Nonlinear Systems

引用

American Control Conference (ACC)

作者： Yan Zheng Georigi M. Dimirovski Yuanwei Jing Muyi Yang School of Information Science & Engineering Northeastern University Shenyang China Faculty of Engineering Computer Engineering Department Dogus University Istanbul Turkey Faculty of Information Science and Engineering Northeastern University Shenyang Liaoning China

The control problem of nonlinear discrete-time systems based on the Takagi-Sugeno (T-S) fuzzy model was addressed. A nonlinear system dynamic model is represented by a T-S fuzzy model. The global T-S fuzzy model of nonlinear system was transformed into linear uncertain system model. So the stabilization problem of nonlinear systems becomes the robust stabilization problem of linear uncertain systems. Discrete-time sliding mode control approach was employed to guarantee robust stabilization of linear uncertain systems. The stable sliding surface was designed by using linear matrix inequalities to reduce the influence of mismatched uncertainties. The sufficient condition for the existence of stable sliding surface was derived in terms of LMI. Moreover the design of sliding mode control law was presented also. The system robust stabilization can be guaranteed and the chattering around the sliding surface in sliding mode control was obviously reduced by the proposed design approach. At last, an illustrative example of truck-trailer was presented to show the feasibility and effectiveness of the proposed method.

关键词： Sliding mode control Nonlinear systems Fuzzy systems Uncertain systems Robust control Control system synthesis Nonlinear control systems Takagi-Sugeno model Fuzzy control Nonlinear dynamical systems

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Feasible Method to Restrain the Bullwhip Effect on the Supply Deficiency Condition

Feasible Method to Restrain the Bullwhip Effect on the Suppl...

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American Control Conference (ACC)

作者： Liqun Gao Yang Li Zhi Kong Jia Ma Dan Li Faculty of Information Science and Engineering Northeastern University Shenyang Liaoning China

The bullwhip effect which brought by supplier implementing the linear assignment mechanism in the condition of supply deficiency was analyzed, and then two reasonable allocation measures to restrain the bullwhip effect were offered. One is based on historical data; the other is based on retailers' retractile ratio, which includes the production assignment with terminable contract and interminable contract. At last useful conclusion for the research of supply chain was got.

关键词： Supply chains Marketing and sales Production Productivity Contracts Cities and towns Logistics Demand forecasting Acceleration Inventory management

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The Application of Fuzzy Method Based on Weight Compromise Coefficient to Peak Load Shifting Distribution

The Application of Fuzzy Method Based on Weight Compromise C...

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American Control Conference (ACC)

作者： Yang Li Liqun Gao Zhi Kong Dan Li Faculty of Information Science and Engineering Northeastern University Shenyang Liaoning China

The distribution of power supply limiting in multi-zone is discussed by means of combining analytical hierarchy process and fuzzy sets theory. From the greatest factors in power limiting distribution, guide line system and hierarchy structure are established. Also, the relative membership degree functions are determined. A novel multi-objective group decision model is suggested by introducing a compromise coefficient between subjective weight and objective weight, which can give attention to both. The model is applied to peak load shifting distribution and the result manifests this model is reasonable and applicable.

关键词： Power generation economics Environmental economics Fuzzy set theory Power supplies Power system modeling Power system economics Information science Power engineering and energy Cities and towns Fuzzy control

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An image watermarking scheme using non-tensor wavelets

An image watermarking scheme using non-tensor wavelets

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2007 International Conference on Wavelet Analysis and Pattern Recognition, ICWAPR '07

作者： Qingyan, He Xinge, You Wang, Patrick S. Yuanyuan, Tang Faculty of Mathematics and Computer Science Hubei University Wuhan China Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan China College of Computer and Information Science Northeastern University Boston MA United States Department of Computer Science Hong Kong Baptist University Hong Kong Hong Kong

ISBN: (纸本)1424410665

Watermarking plays a significant role in copyright protection. In this paper, a new method of digital watermarking is proposed based on a new non-tensor bivariate wavelet filter banks with linear phase, which are constructed from the centrally symmetric matrices. Our investigation demonstrates that the constructed non-tensor product bivariate wavelet filters have the following desirable properties, namely, its corresponding wavelet transform can detect more singularities of the host image with reflecting whole orientation while only three orientations being considered by traditional discrete separable transform(DWT). For this reason, details are given more in middle and high frequency, the imperceptible and robust requirements of watermarks are fulfilled and optimized. Some experiments with detailed comparisons with DWT are carried out. Experiments are conducted and positive results are achieved, which show that the proposed watermarking scheme is applicable to the gray image, and the watermark is robust against noise, compression, scaling, cropping and sharpening. © 2007 IEEE.

关键词： Discrete wavelet transforms

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Global Stability Analysis about a Congestion Control Scheme for Networks with Time Delay

Global Stability Analysis about a Congestion Control Scheme ...

引用

American Control Conference (ACC)

作者： Yuanwei Jing Muyi Yang Georigi M. Dimirovski Tao Ren Yan Zheng Faculty of Information Science and Engineering Northeastern University Shenyang China Faculty of Engineering Computer Engineering Department Dogus University Istanbul Turkey

In this paper, a congestion control scheme is developed, analyzed and implemented in a noncooperative game framework. By using a network model based on fluid approximations and through a realistic modeling of queues, the existence of a unique equilibrium is established as well as its global asymptotic stability for a general network topology, where boundary effects are also taken into account. The sufficient conditions are also provided for system stability when there is a bottleneck link shared by multiple users experiencing non-negligible communication delays. The theoretic results are meaningful for communication networks.

关键词： Stability analysis Delay effects Bandwidth Communication system control Pricing Internet Algorithm design and analysis Convergence Feedback Game theory

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Robust Stabilization of State and Input Delay for Active Queue Management Algorithm

Robust Stabilization of State and Input Delay for Active Que...

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American Control Conference (ACC)

作者： Yuan-wei Jing Ling He Georigi M. Dimirovski Hai-yu Zhu School of Information Science and Engineering Northeastern University Shenyang China School of information Science and Engineering Northeastern University Shenyang China Faculty of Engineering Computer Engineering Department Dogus University Istanbul Turkey

In this paper, we propose a design of an active-queue-management (AQM) scheme based on delay dependent sliding-mode-control (SMC), which is aimed at robust stabilization of network system with delay in both the input and state variables. A sliding surface that is based on a predictor has been designed to minimize the effect of the input delay. An AQM controller is derived to ensure the existence of a sliding mode on the surface. A maximum allowable value for the time delay of the system has been found under the AQM controller, uniformly bounded. Simulation experiments have been carried our and the results demonstrate this scheme can achieve transient and steady-state responses. The results also show that this scheme outperforms the known ones with the traditional either proportional-plus integral or sliding-mode controls.

关键词： Robustness Sliding mode control Control systems Robust control Delay effects Internet Helium Delay systems Information science Uncertainty

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Backstepping-based Direct Adaptive Fuzzy Control for SISO Nonlinear Systems

Backstepping-based Direct Adaptive Fuzzy Control for SISO No...

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 919-1382

作者： Qingli Wang Yuanwei Jing Lifu Wang Zhi Kong Shenyang Institute of Engineering China Faculty of Information Science and Engineering Northeastern University Shenyang Liaoning China

ISBN: (纸本)9781424414970;1424414970

In this paper, adaptive fuzzy control scheme is proposed for a class of uncertain single-input and single-output (SISO) nonlinear systems with lower triangular form. The backstepping technique is applied to construct an adaptive fuzzy tracking controller which guarantees the output of system to follow the reference signal, and ensures uniform ultimate boundedness of all signals in the closed-loop system. The tracking error dynamics are proved to converge to small neighborhood of the origin. The control performance of the closed-loop system is guaranteed by properly choosing the design parameters. The proposed scheme offers systematic design procedure for the control of the uncertain nonlinear systems with lower triangular form. A main advantage of the suggested design scheme is that the adaptive mechanism with minimal learning parameterizations is obtained. To solve tracking control problems for an n-th order nonlinear system, there are at most n parameters needed to be adapted online. Finally, two simulation examples are used to demonstrate the effectiveness of the approaches presented in this paper.

关键词： Nonlinear systems adaptive fuzzy control design scheme Fuzzy control Reference signals Uncertain nonlinear system control performance tracking control design process Induction loop systems Triangular uniform ultimate boundedness

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Stability and Performance Analysis of a Congestion Control Algorithm for Networks

Stability and Performance Analysis of a Congestion Control A...

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 919-1382

作者： Muyi Yang Yuanwei Jing Georigi M. Dimirovski Nannan Zhang Faculty of Information Science and Engineering Northeastern University Shenyang China Faculty of Engineering Computer Engg.Dept Dogus University Istanbul Turkey

ISBN: (纸本)9781424414970;1424414970

In this paper, we show that max-min fair congestion control methods with a stable symmetric Jacobian remain stable under arbitrary feedback delay and the stability condition of such methods does not involve any of the delays. To demonstrate the practicality of the obtained result, we change the original algorithm in Kelly's work to become robust under random feedback delay and fixed constants of the control equation. The performance analysis shows that it offers smooth sending rate, exponential convergence to efficiency, and fast convergence to fairness, all of which make it be meaningful for future high-speed networks.

关键词： Computer algorithms Steady state Network High-speed networks stalls(animals) Feedback Converge delay Control Methods

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