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检索条件"任意字段=Symposium on Dynamics and Control of Process Systems"

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Identification and controller tuning of cascade control systems based on closed-loop step responses

Identification and controller tuning of cascade control syst...

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8th International symposium on Advanced control of Chemical processes, ADCHEM 2012

作者： Jeng, Jyh-Cheng Lee, Ming-Wei Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei 106 Taiwan Department of New Materials Research and Development China Steel Corporation Kaohsiung 812 Taiwan

ISBN: (纸本)9783902823052

This paper presents a new automatic tuning method for cascade control systems based on a single closed-loop step test. The proposed method identifies the required process information with the help of B-spline series expansions for the step responses. The two PID controllers are then tuned using an internal model control (IMC) approach. The secondary controller is designed for enhanced disturbance rejection, and the primary controller is designed, without requiring an additional test, based on an identified process model that accurately accounts for the inner loop dynamics. The desired levels of system robustness explicitly guide the selection of the IMC tuning parameters. The proposed method is robust to measurement noises because of the filtering property of the B-splines, and can provide satisfactory control performance. Simulation examples confirm the effectiveness of the proposed method. © 2012 IFAC.

关键词： Interpolation

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Implementation and closed loop identification of a two wheeled inverted pendulum mobile robot

Implementation and closed loop identification of a two wheel...

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2012 1st Brazilian Robotics symposium, SBR 2012 and 9th Latin American Robotics symposium, LARS 2012

作者： Morales, Gladys Y. Plazas, Sergio A. Cómbita, Luis F. Department of Electronics Engineering Universidad Distrital FJC Bogotá D. C Colombia

ISBN: (纸本)9780769549064

In this paper the hardware development for the implementation of a Two Wheeled Inverted Pendulum (TWIP) and the closed loop identification process is described. In the identification process, a linear model for a single-input multiple-output (SIMO) system is used for representing the robot dynamics. The Sum of the Square Error (SSE) is adopted as the comparison criteria between the output of the simulated model and the output data measured from the robot implemented. © 2012 IEEE.

关键词： Identification (control systems)

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Model predictive control of a hybrid fuel cell & battery power system

Model predictive control of a hybrid fuel cell & battery pow...

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8th International symposium on Advanced control of Chemical processes, ADCHEM 2012

作者： Behrendt, Martin Bajcinca, Naim Zenith, Federico Krewer, Ulrike Max Planck Institute for Dynamics of Complex Technical Systems Sandtorstr 1 39106 Magdeburg Germany Technische Universität Berlin Einsteinufer 17 10587 Berlin Germany Sintef Applied Cybernetics O.S. Bragstads plass 2D 7034 Trondheim Norway Institute for Energy and Process Systems Engineering TU Braunschweig Franz-Liszt-Str. 35 38106 Braunschweig Germany

ISBN: (纸本)9783902823052

This paper considers optimal operation of an hybrid powered energy system. The two power sources include a direct methanol fuel cell and a lithium-ion battery. A portable system represented by characteristic dynamic load profiles is considered as the consumer. A PI and a nonlinear model predictive control algorithm have been investigated and compared in terms of efficiency and robustness of operation. © 2012 IFAC.

关键词： Model predictive control

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Scheme for time-optimal operation of semi-batch emulsion polymerization reactors

Scheme for time-optimal operation of semi-batch emulsion pol...

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8th International symposium on Advanced control of Chemical processes, ADCHEM 2012

作者： Pelz, K. Brandt, H. Finkler, T.F. Engell, S. Department of Biochemical and Chemical Engineering Process Dynamics and Operations Group Technische Universitt Dortmund 44221 Dortmund Germany

ISBN: (纸本)9783902823052

Emulsion polymerization processes are characterized by exothermic reactions with complicated nonlinear dynamics. A very precise temperature control is necessary in order to ensure that the end product satisfies the quality demands. In industry, this issue is addressed by adopting a conservative monomer feed policy such that a robust operation is guaranteed under various disturbing influences. A combination of a monomer feed controller based on jacket temperature constraint and a monomer feed controller based on droplet phase avoidance constraint that optimizes the batch time is analysed in terms of robustness and performance. The simulation results show that the scheme reduces the batch time without harming the quality of the temperature control. © 2012 IFAC.

关键词： Robust control

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Motion planning under uncertainty using iterative local optimization in belief space

Motion planning under uncertainty using iterative local opti...

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15th International symposium on Robotics Research (ISSR)

作者： van den Berg, Jur Patil, Sachin Alterovitz, Ron Univ Utah Sch Comp Salt Lake City UT 84112 USA Univ N Carolina Dept Comp Sci Chapel Hill NC USA

We present a new approach to motion planning under sensing and motion uncertainty by computing a locally optimal solution to a continuous partially observable Markov decision process (POMDP). Our approach represents beliefs (the distributions of the robot's state estimate) by Gaussian distributions and is applicable to robot systems with non-linear dynamics and observation models. The method follows the general POMDP solution framework in which we approximate the belief dynamics using an extended Kalman filter and represent the value function by a quadratic function that is valid in the vicinity of a nominal trajectory through belief space. Using a belief space variant of iterative LQG (iLQG), our approach iterates with second-order convergence towards a linear control policy over the belief space that is locally optimal with respect to a user-defined cost function. Unlike previous work, our approach does not assume maximum-likelihood observations, does not assume fixed estimator or control gains, takes into account obstacles in the environment, and does not require discretization of the state and action spaces. The running time of the algorithm is polynomial (O[n(6)]) in the dimension n of the state space. We demonstrate the potential of our approach in simulation for holonomic and non-holonomic robots maneuvering through environments with obstacles with noisy and partial sensing and with non-linear dynamics and observation models.

关键词： Motion planning under uncertainty non-holonomic motion planning belief space planning partially observable Markov decision process (POMDP) integrated planning and control

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Varicol process optimization strategy based on the solution of a MINLP

Varicol process optimization strategy based on the solution ...

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8th International symposium on Advanced control of Chemical processes, ADCHEM 2012

作者： Torres, Ixbalank Wouwer, Alain Vande Service d'Automatique Université de Mons Bd. Dolez 31 B7000 Mons Belgium

ISBN: (纸本)9783902823052

Varicol is a continuous chromatographic separation process which is based on the simulated moving bed principle with an asynchronous commutation of the inlet and outlet streams. The objective of this work is to develop a systematic procedure to optimize the operating conditions of the Varicol process, including the commutation sequence and the internal flow rates. To this end, the continuous dynamics are represented using a conventional mass-balance partial differential equation model, whereas the discrete dynamics are described by a timed transition Petri net. A Mixed-Integer Non-Linear Problem (MINLP) is formulated to maximize the process productivity under constraints on the desired purities of both the extract and the raffinate components. The MINLP is solved by constructing a set of candidate integer parameters and solving the resulting nonlinear problem for a subset of candidates selected on the basis of an approximate evaluation using the (true moving bed) triangle theory. Numerical results show the feasibility of this approach. © 2012 IFAC.

关键词： Productivity

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Analysis and optimization of the battery energy storage systems for frequency control in autonomous microgrids, by means of hardware-in-the-loop simulations

Analysis and optimization of the battery energy storage syst...

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2012 3rd IEEE International symposium on Power Electronics for Distributed Generation systems, PEDG 2012

作者： Serban, I. Teodorescu, R. Marinescu, C. Transilvania University of Brasov Department of Electrical Engineering Eroilor 29 500036 Brasov Romania Aalborg University Department of Energy Technology Pontoppidanstraede 101 Aalborg 9220 Denmark

ISBN: (纸本)9781467320238

This paper presents an original hardware-in-the-loop (HIL) solution for real-time testing and optimization of the frequency control mechanism in autonomous microgrids (MG), when battery energy storage systems (BESS) are integrated along classical and RES-based generators to stabilize the frequency. The focus is on autonomous MGs that dynamically should perform similarly to the conventional power systems. During MG autonomous operation, the generators should accomplish the frequency control process, by means of their automatic generation control. However, RES-based generators have poor controllability in terms of active power, and therefore the need of improving the MG power reserve by adding energy storage systems is often demanded. The proposed HIL solution aims to improve the design of the BESS frequency control systems according to the MG characteristics, being based on aggregated models of the involved mechanisms in the MG dynamics. An experimental test bench including a real-time digital simulator with BESS controller in the HIL structure is used for assessing the proposed system performances. © 2012 IEEE.

关键词： Battery storage

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L1 adaptive controller and its application to main steam temperature process control

L1 adaptive controller and its application to main steam tem...

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55th ISA POWID symposium 2012

作者： Wang, Chuan Yang, Shizhong Cao, Chengyu Lou, Xinsheng Neuschaefer, Carl University of Connecticut United States Alstom Power Inc. United States

ISBN: (纸本)9781622761371

As one of the most important parts of a modern steam power plant, proper main steam temperature control is required to maintain high efficiency, flexible load following capability and minimum thermal stresses and equipment cycling to maintain high unit availability. However, most fossil powered steam plants exhibit nonlinear, long time-delays and time-varying process characteristics which impose complexity for accurate control. Compared to conventional PID controllers, the L1 adaptive controller provides a better control performance in considering these complicated conditions of the thermal plant. The "L1 adaptive controller" technique has been proved to provide fast adaptation of transient response in a large variety of systems due to its basic control architecture that the state predictor offers a model estimation of the dynamics of the system, while the adaptive law deals with the mismatch of the model. Some of the model based control methods usually need to obtain the model of the plant at the beginning and depend on the accurateness of the model, while there is no such requirement in the L1 adaptive controller, which simplifies the process of controller design. On the other hand, some model-based controllers may not work properly if the dynamics of the system changes. However, the robustness of the L1 adaptive controller guarantees that a good control performance can also be achieved in such conditions. In this paper, the L1 adaptive controller has been examined for the control of a power plant's main steam temperature. Due to its robustness and fast adaptation, the L1 adaptive controller is demonstrated to obtain a better transient performance than the PID controller. Further the adaptive controller is shown to reduce the process transients caused by disturbances of changing MW and thermal load. The simulation results for both regulation around a typical load condition and control during load changes indicate that the control effect of L1 controller is superio

关键词： Steam power plants

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A sliding mode control strategy for temperature trajectory tracking in batch processes

A sliding mode control strategy for temperature trajectory t...

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8th International symposium on Advanced control of Chemical processes, ADCHEM 2012

作者： Chen, Chyi-Tsong Department of Chemical Engineering Feng Chia University 100 Wenhwa Rd. Seatwen Taichung 407 Taiwan

ISBN: (纸本)9783902823052

In this paper, a model-based sliding mode control strategy is suggested for temperature trajectory tracking in batch processes. The convergence property as well as the stability of the sliding mode control system is guaranteed theoretically by means of satisfying a sliding condition. Simulation results reveal that the proposed sliding mode control strategy is a simple and effective approach to batch process control, which provides robust control despite the wide range of operating conditions, plant/model mismatch, and nonlinear dynamics of the system. © 2012 IFAC.

关键词： Sliding mode control

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A new Robust NMPC Scheme and its application to a semi-batch reactor example

A new Robust NMPC Scheme and its application to a semi-batch...

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8th International symposium on Advanced control of Chemical processes, ADCHEM 2012

作者： Lucia, S. Finkler, T. Basak, D. Engell, S. Department of Biochemical and Chemical Engineering Process Dynamics and Operations Group Technische Universität Dortmund 44221 Dortmund Germany

ISBN: (纸本)9783902823052

In this paper, a non-conservative robust nonlinear model predictive control scheme that can guarantee satisfaction of the constraints and optimal expected performance under uncertainty is introduced. The proposed control scheme is evaluated by simulations using a well known benchmark problem where the operation of a semi-batch polymerization reactors is optimized under very tight temperature tolerance limits. The simulation results show that the proposed scheme is capable of optimizing the process operation and, at the same time, it ensures robust operation within the whole range of uncertainties. © 2012 IFAC.

关键词： Robust control

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