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Phase angle adjustment for phase advance control of brushless DC motor

Phase angle adjustment for phase advance control of brushles...

引用

International Conference on Intelligent and Advanced systems, ICIAS

作者： Mohd Syafiq bin Mohd Mohd Noh bin Karsiti Mohd Syaifuddin bin Mohd Automation and Control System Cluster / MOR Energy Department of Electrical Engineering UniversitiTeknologi PETRONAS Malaysia Automation and Control System Cluster/MOR Energy UniversitiTeknologi PETRONAS

Brushless direct current (BLDC) motor is widely used in small and medium side electric vehicles as it exhibit highest specific power and thermal efficiency compared with induction motor. The permanent magnets in the rotor create a constant magnetic flux, which limit the motor top speed. As the back electromotive force (EMF) voltage increases proportionally with motor rotational speed and it approaches the amplitude of the input voltage, the phase current amplitude will reach zero. By advancing the phase current, it is possible to extend the maximum speed of the BLDC motor beyond the rated top speed. This will allow smaller BLDC motor to be used in small electric vehicles and in larger applications will allow the use of BLDC motor without the use of multispeed transmission unit for high speed operation. Adjusting the phase angle will affect the speed of the motor as the each coil is energized earlier than the corresponding rise in back emf of the coil. Preliminary test results indicated that the motor top speed can be increased at least by 40 percent over the baseline speed at no load condition.

关键词： Permanent magnet motors Induction motors Torque Mathematical model Brushless DC motors

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Improving L2 gain performance of linear systems by reset control 19

Improving L2 gain performance of linear systems by reset con...

引用

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

作者： Zhao, Guanglei Nešić, Dragan Tan, Ying Wang, Jingcheng Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Department of Electrical and Electronic Engineering University of Melbourne ParkvilleVIC3010 Australia

ISBN: (纸本)9783902823625

In this paper, new Lyapunov-based reset rules are constructed to improve C2 gain performance of linear-time-invariant (LTI) systems. By using the hybrid system framework, sufficient conditions for exponential and finite gain C2 stability are presented. It is shown that the C2 gain of the closed loop system with resets can be improved compared with the base system. Numerical example supports our results. © IFAC.

关键词： Closed loop systems

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An adaptive predictive control strategy for RMPPT under partially shaded conditions 19

An adaptive predictive control strategy for RMPPT under part...

引用

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

作者： Ma, Chao Wu, Jing Li, Ning Li, Shaoyuan Li, Kang 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 United Kingdom

ISBN: (纸本)9783902823625

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. © IFAC.

关键词： Adaptive control systems

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An Alternative Scheme for Adaptive Backstepping control

An Alternative Scheme for Adaptive Backstepping Control

引用

第26届中国控制与决策会议

作者： Zhengqiang Zhang Xiqiang Cao Mingxia Zhang Mingxing Zhang School of Electrical Engineering and Automation Qufu Normal University Key Laboratory of System Control and Information Processing Ministry of Education

In this paper, we present a new adaptive backstepping control design method to solve the overparametrization problem in parameter estimation. Unlike the existing schemes, the concept of tuning functions is not ***, the number of parameter estimates is reduced to be minimal, which is exactly the same as that of unknown parameters. The parametric strict-feedback system is employed to illustrate our design procedure.

关键词： Tuning functions,Adaptive control,Nonlinear systems

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Immersion and Invariance based Adaptive Attitude Tracking control of a Quadrotor UAV in the Presence of Parametric Uncertainty

Immersion and Invariance based Adaptive Attitude Tracking Co...

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第三十三届中国控制会议

作者： Bo Zhao Bin Xian Yao Zhang Xu Zhang The Institute of Robotics and Autonomous System the Tianjin Key Laboratory of Process Measurement and ControlSchool of Electrical Engineering and Automation Tianjin University

ISBN: (纸本)9781479947249

In this paper, a new adaptive controller for a quadrotor unmanned aerial vehicle(UAV) is presented via Immersion and Invariance(I&I) approach. The quadrotor's dynamic model is subjected to some uncertain parameters such as the inertial moments, aerodynamic damping coefficients and so on. In particular, the mass-eccentric effects by the payloads are also *** all these uncertainties above, the proposed adaptive controller is still capable of driving the quadrotor UAV's attitude asymptotically to a desired trajectory. The stability analysis is performed by Lyapunov techniques and LaSalle's invariance theorem. Numerical simulation results illustrate the good tracking performance of the proposed scheme.

关键词： quadrotor,UAV,adaptive control,immersion and invariance,I&I

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On overcoming limitations of a class of linear systems with first-order reset elements

On overcoming limitations of a class of linear systems with ...

引用

World Congress on Intelligent control and automation (WCICA)

作者： Guanglei Zhao Jingcheng Wang Kang Li Department of Automation Key Laboratory of System Control and Information Processing China Electrical Engineering and Computer Science Queens University Belfast UK

This paper considers using reset control to improve transient performance and overcome some fundamental limitations of linear systems. First, an auxiliary system is presented, then, based on which, a new reset control model is proposed, such that the non-overshoot performance specification can be met for any minimum phase relative degree one plants, the results imply some limitations of linear systems are overcome and clearly illustrate the advantages of reset control. A numerical example is given to show the effectiveness.

关键词： Closed loop systems Stability analysis Gold Linear systems Steady-state Educational institutions

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On infinite time performance of nonlinear model predictive controllers 19

On infinite time performance of nonlinear model predictive c...

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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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Finite-time stability and stabilization of It stochastic time-varying systems

Finite-time stability and stabilization of It stochastic t...

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第三十三届中国控制会议

作者： YAN Zhiguo ZHANG Weihai LIN Zhongwei School of Electrical Engineering and Automation Qilu University of Technology College of Electrical Engineering and Automation Shandong University of Science and Technology State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer EngineeringNorth China Electric Power University

This paper deals with the finite-time stability and stabilization for continuous-time linear stochastic time-varying systems. Several necessary and sufficient conditions and a sufficient condition for finite-time stability are derived. Moreover,a sufficient condition for the existence of state feedback controller is given. Such results involve the feasibility problems of differential linear matrix inequalities with terminal constraint.

关键词： Stochastic systems,time-varying systems,finite-time stability

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An intermittent iterative learning control design based on a 2D roesser system

An intermittent iterative learning control design based on a...

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World Congress on Intelligent control and automation (WCICA)

作者： Xuhui Bu Long Zhang Fashan Yu Zhongsheng Hou School of Electrical Engineering & Automation Henan Polytechnic University Jiaozuo China Advanced Control System Laboratory Beijing Jiaotong University Beijing China

In network-based iterative learning control (ILC) systems, intermittent measurement often occurs during the data packet transfers from the remote plant to the ILC controller. In this paper, measurement missing is modeled by stochastic variables satisfying the Bernoulli random binary distribution, and then the design of ILC law is transformed into a feedback control problem of a 2D stochastic system described by Roesser model. A sufficient condition for mean-square asymptotic stability is established by means of linear matrix inequality (LMI) technique, and formulas can be given for the control law design simultaneously. A numerical example illustrates the effectiveness of the proposed results.

关键词： Asymptotic stability Stochastic systems Educational institutions Sufficient conditions Indexes Networked control systems

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Robust control reconfiguration of resource allocation systems with Petri nets and integer programming

Robust control reconfiguration of resource allocation system...

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作者： Li, Jun Zhou, Mengchu Guo, Tao Gan, Yahui Dai, Xianzhong Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education China School of Automation Southeast University Nanjing 210096 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 201804 China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

Supervisory control reconfiguration can handle the uncertainties including resource failures and task changes in discrete event systems. It was not addressed to exploit the robustness of closed-loop systems to accommodate some uncertainties in the prior studies. Such exploitation can cost-efficiently achieve reconfigurability and flexibility for real systems. This paper presents a robust reconfiguration method based on Petri nets (PNs) and integer programming for supervisory control of resource allocation systems (RASs) subject to varying resource allocation relationships. An allocation relationship is seen as a control specification while the execution processes requiring resources as an uncontrolled plant. First, a robust reconfiguration mechanism is proposed. It includes updating the P-invariant-based supervisor and evolving the state of the closed-loop system. The latter adapts to the control specification changes by the self-regulation of the closed-loop system's state. Next, two novel integer programming models for control reconfiguration are proposed, called a reconfiguration model with acceptability and reconfiguration one with specification correction. Since both models integrate the firability condition of transitions, no additional efforts are required for the state reachability analysis. Finally, a hospital emergency service system is used as an example to illustrate them. © 2014 Elsevier Ltd. All rights reserved.

关键词： Integer programming

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