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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Cai, Xin Li, Shaoyuan Li, Ning Li, Kang Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education Shanghai200240 China School of Electronics Electrical Engineering and Computer Science Queen's University Belfast BelfastBT7 1NN United Kingdom

ISBN: (纸本)9783902823625

This paper addresses the problem of infinite time performance of model predictive controllers applied to constrained nonlinear systems. The total performance is compared with a finite horizon optimal cost to reveal performance limits of closed-loop model predictive control systems. Based on the Principle of Optimality, an upper and a lower bound of the ratio between the total performance and the finite horizon optimal cost are obtained explicitly expressed by the optimization horizon. The results also illustrate, from viewpoint of performance, how model predictive controllers approaches to infinite optimal controllers as the optimization horizon increases. © IFAC.

关键词： controllers

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A Method to Calculate the Change of Turbine Power Output Caused by the Condenser Pressure Adjustment

A Method to Calculate the Change of Turbine Power Output Cau...

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2014 International Conference on Energy, Environment and Materials Engineering(EEME 2014)

作者： Wei WANG Yong HU De-liang ZENG State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer EngineeringNorth China Electric Power University

It is necessary to acquire the relationship between the turbine power output and condenser pressure under the certain steam load since the condenser pressure has a great influence on the turbine power *** paper first analyzes the varying parameters of the regenerative extraction cycle system caused by condenser pressure adjustment,and then sets up their calculating models through mechanism analysis and formula *** this basis,this paper attains the change of turbine power output caused by condenser pressure adjustment through the power expression.

关键词： Condenser pressure Turbine power output Steam-water distribution

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Research on optimization of flight scheduling problem based on the combination of ant colony optimization and genetic algorithm

Research on optimization of flight scheduling problem based ...

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IEEE International Conference on Software Engineering and Service Sciences (ICSESS)

作者： Wenkuai Liang Yi Li College of Computer Science Sichuan University Chengdu Sichuan China National Key Laboratory of Air Traffic Control Automation System Technology Chengdu Sichuan China

As the flight scheduling has always been a key technology which reduces flight delays and costs. Rational and efficient flight sorting method not only can effectively improve the utilization of the airport, reduce flight delay, but also ensure flight safety and reduce the incidence of sudden accidents. Firstly, we studied the application of ant colony algorithm in flight sorting, and proposed a new flight sorting method which is combined with ant colony algorithm and genetic algorithm depending on the mutation characteristic of genetic algorithm; Secondly, the minimization objective model that the flight total delay was minimum was established based on the sorting method; Finally, the simulation experiment was done based on the model. The simulation results show that the proposed method can effectively reduce flight delay. Comparing with ant colony algorithm, the global optimal flight sequence can be found in a shorter time.

关键词： Genetic algorithms Sorting Optimal scheduling Educational institutions Delays Algorithm design and analysis

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Research on flight scheduling of two runways based on the fusion of artificial fish school algorithm and genetic algorithm

Research on flight scheduling of two runways based on the fu...

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IEEE International Conference on Software Engineering and Service Sciences (ICSESS)

作者： Jingjing Li Wenkuai Liang Yi Li College of Computer Science Sichuan University Chengdu Sichuan China System Technology National Key Laboratory of Air Traffic Control Automation Chengdu Sichuan China

The fusion of artificial fish algorithm and genetic algorithm is proposed to optimize the flight scheduling of two-runway in large airport in which the problems are difficult, inefficient and serious flight delays. First, in this paper, the shortcomings of artificial fish algorithm and genetic algorithm are analyzed, and combing the advantages of two algorithms, optimization algorithm is proposed based on the fusion of artificial fish swarm algorithm and genetic algorithm; Secondly, the objective function model of the total of time-consuming which is minimum about dual runway is established; Finally, the simulation results show that the fusion algorithm in operating efficiency, the reduction of flight delays and other aspects is better than first-come, first-served (FCFS), artificial fish algorithm and genetic algorithm, and can get better convergence results.

关键词： Marine animals Algorithm design and analysis Genetic algorithms Aircraft Scheduling Delays Heuristic algorithms

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Air traffic flow of genetic algorithm to optimize wavelet neural network prediction

Air traffic flow of genetic algorithm to optimize wavelet ne...

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IEEE International Conference on Software Engineering and Service Sciences (ICSESS)

作者： Fucheng Qiu Yi Li College of Computer Science Sichuan University Chengdu Sichuan China National Key Laboratory of Air Traffic Control Automation System Technology Chengdu Sichuan China

ISBN: (纸本)9781479932801

The scientific and accurate forecast of air traffic flow is not only an effective protection to maintain the air traffic flow continued and unimpeded, and also is an important basis for the air traffic flow management(ATFM) to make decisions and development strategies. Based on the character of flow prediction, the prediction method of genetic algorithm to optimize wavelet neural network is proposed. It uses genetic algorithms with the natural evolution laws to conduct the pre-optimized training for the connection weights and stretching translation scales of the wavelet neural network, overcoming the drawbacks of easy to fall into local minima and causing oscillation effect of wavelet neural network with a single gradient descent method. The air flow prediction simulation using the GA-WNN prediction model demonstrates the validity of the model.

关键词： Genetic algorithms Optimization Training Atmospheric modeling Biological neural networks Predictive models

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An Adaptive Predictive control Strategy for RMPPT under Partially Shaded Conditions

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IFAC Proceedings Volumes 2014年第3期47卷 4947-4952页

作者： Chao Ma Jing Wu Ning Li Shaoyuan Li Kang Li Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai China School of Electronics Electrical Engineering and Computer Science Queen's University Belfast UK

As one of key technologies in photovoltaic converter control, Maximum Power Point Tracking (MPPT) methods can keep the power conversion efficiency as high as nearly 99% under the uniform solar irradiance condition. However, these methods may fail when shading conditions occur and the power loss can over as much as 70% due to the multiple maxima in I – P curve in shading conditions v.s. single maximum point in uniformly solar irradiance. In this paper, a Real Maximum Power Point Tracking (RMPPT) strategy under Partially Shaded Conditions (PSCs) is introduced to deal with this kind of problems. An optimization problem, based on a predictive model which will change adaptively with environment, is developed to tracking the global maxima and corresponding adaptive control strategy is presented. No additional circuits are required to obtain the environment uncertainties. Finally, simulations show the effectiveness of proposed method.

关键词： Photovoltaic systems RMPPT Partial shading Adaptive predictive control

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Mixed H2/H− pitch control of wind turbine generator system based on exact linearization and regional pole placement

Mixed H2/H− pitch control of wind turbine generator system ...

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Chinese control Conference (CCC)

作者： Mu Zhu Jizhen Liu Zhongwei Lin State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing Beijing CN

When the wind power electricity system working above the rated wind speed, the disturbed wind speed can lead to the output power ripple easily, which causes a significant negative influence on the stability of the power grid. In order to overcome this disadvantage, this paper discusses the mixed H 2 /H ∞ pitch angle control design problem for the nonlinear wind turbine generator system (WTGS), where the turbulence is regarded as the disturbance input. Especially, the traditional exact linearization and the pole placement techniques are also applied to guarantee the desired control performance and expected dynamic characteristics in the situation of a large-scale variety of the system operation points. The simulation results show the effectiveness of the proposed method.

关键词： Wind speed Wind turbines Generators Rotors Torque Wind power generation

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A GPU-based Parallel Simulation Platform for Large-scale Wind Farm Integration

A GPU-based Parallel Simulation Platform for Large-scale Win...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： Haixiang Gao Ying Chen Yin Xu Zhitong Yu Laijun Chen State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University School of Electrical Engineering and Computer Science Washington State University

ISBN: (纸本)9781479936571

Due to the energy crisis of the next fifty years, an increasing number of large-scale wind farms are integrating into power systems. Parallel simulation platforms are indispensable to evaluate the effects of wind farm integration. A GPU-based parallel simulation platform is constructed in this paper to test the feasibility of simulating integration systems on GPU. By adopting previous research work such as averaged model and improved EMTP algorithm, models and algorithm of the platform are firstly introduced. Then the hardware and software architecture of the platform are put forward, which combine CPU configuration and GPU computing. Finally, a wind farm with different numbers of DFIGs are used to test the performance of the platform. Results show that the platform has excellent accuracy, efficiency and scalability. The work of this paper proves the feasibility to simulate wind farm integrating dynamics adopting GPU and its potential to reach tremendous efficiency and scalability.

关键词： Power system simulation Power system modelling

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A formal model for attack mutation using dynamic description logics 8

A formal model for attack mutation using dynamic description...

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8th IFIP International Conference on Intelligent Information Processing, IIP 2014

作者： Wang, Zhuxiao Guo, Jing Shi, Jin He, Hui Zhang, Ying Peng, Hui Tian, Guanhua School of Control and Computer Engineering State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing100029 China Education Technology Center Beijing International Studies University Beijing100024 China Institute of Automation Chinese Academy of Sciences Beijing100190 China

ISBN: (纸本)9783662449790

All currently available Network-based Intrusion Detection systems (NIDS) rely upon passive protocol analysis which is fundamentally flawed as an attack can evade detection by exploiting ambiguities in the traffic stream as seen by the NIDS. We observe that different attack variations can be derived from the original attack using simple transformations. This paper proposes a semantic model for attack mutation based on dynamic description logics (DDL(X)), extensions of description logics (DLs) with a dynamic dimension, and explores the possibility of using DDL(X) as a basis for evasion composition. The attack mutation model describes all the possible transformations and how they can be applied to the original attack to generate a large number of attack variations. Furthermore, this paper presents a heuristics planning algorithm for the automation of evasion composition at the functional level based on DDL(X). Our approach employs classical DL-TBoxes to capture the constraints of the domain, DL-ABoxes to present the attack, and DL-formulas to encode the objective sequence of packets respectively. In such a way, the evasion composition problem is solved by a decidable tableau procedure. The preliminary results certify the potential of the approach. © IFIP International Federation for Information Processing 2014.

关键词： Semantics

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Implementation and test of human-operated and human-like adaptive impedance controls on Baxter robot

Implementation and test of human-operated and human-like ada...

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15th Annual Conference on Advances in Autonomous Robotics systems, TAROS 2014

作者： Liang, Peidong Yang, Chenguang Wang, Ning Li, Zhijun Li, Ruifeng Burdet, Etienne Centre for Robotics and Neural Systems School of Computing and Mathematics Plymouth University United Kingdom MOE Key Lab. of Autonomous System and Network Control College of Automation Science and Engineering South China University of Technology China State Key Laboratory of Robotics and System Harbin Institute of Technology China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong Department of Bioengineering Imperial College of Science Technology and Medicine London United Kingdom

ISBN: (纸本)9783319104003

This paper presents an improved method to teleoperate impedance of a robot based on surface electromyography (EMG) and test it experimentally. Based on a linear mapping between EMG amplitude and stiffness, an incremental stiffness extraction method is developed, which uses instantaneous amplitude identified from EMG in a high frequency band, compensating for non-linear residual error in the linear mapping and preventing muscle fatigue from affecting the control. Experiments on one joint of the Baxter robot are carried out to test the approach in a disturbance attenuation task, and to compare it with automatic human-like impedance adaptation. The experimental results demonstrate that the new human operated impedance method is successful at attenuating disturbance, and results similarly to as automatic disturbance attenuation, thus demonstrating its efficiency. © 2014 Springer International Publishing.

关键词： Stiffness

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