摘要:

Parameter optimization methods are known to be an efficient tool for synthesizing multivariable regulators, especially when constraints are present on both their structure and the robustness of the control system. However, most of the underlying numerical algorithms first require the selection of a regulator satisfying all the assigned constraints, which is often non-trivial. This paper aims at presenting some new results on this subproblem. Specifically, constructive sufficient conditions are given for the existence of simple low-gain centralized and decentralized regulators supplying the closed-loop system with asymptotic stability as well as robust zero-error regulation in the face of ramp-type exogenous signals. Next, solutions are presented to two design problems incorporating constraints on the robustness of the control system with respect to large plant parameter variations.

ISSN:0020-7179    

DOI:10.1080/00207179008934091

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A practical design method for feedback systems with large plant uncertainty and time-varying gain is presented. By combining quantitative feedback theory and the circle criterion, the design method assures the stability of the system and improves the performance of the system when the time-varying gain exists.

ISSN:0020-7179    

DOI:10.1080/00207179008934092

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

The control design of systems with lightly damped high frequency oscillatory modes is treated. Systems exhibiting these lightly damped modes include turbine generators and large flexible structures. Frequently the dynamics of these high-frequency modes are not known very accurately. As a result, the design objective is to improve the slow dynamics without destabilizing the high-frequency modes. From a classical frequency domain design viewpoint, this is in part a filtering problem requiring some kind of high-frequency filter. The singular perturbation method is used to systematically develop a two-time-scale method to design these high-frequency filters and provides guidelines on the kind of high-frequency filter to be used. In addition, the method provides an asymptotic error analysis. The design is illustrated with an example representative of a power system model with a two-mass turbine-generator model.

ISSN:0020-7179    

DOI:10.1080/00207179008934093

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A method is described to solve the ‘standard’H∞optimal control problem polynomially. The polynomial equations for equalizing solutions are of a homotopy type, so that the equations may be transformed accordingly to a set of non-linear ordinary differential equations.

ISSN:0020-7179    

DOI:10.1080/00207179008934094

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A simple feedback controller methodology is presented that allows for exact tracking of the sinusoidal input signals and rejection of the sinusoidal disturbances in a closed loop control system. The control method is motivated by a mathematical inequality that expresses the tracking and disturbance rejection requirements for a closed loop system. The exact tracking of the input command at a particular frequency requires an infinite loop gain for the system at the frequency of the in put command. A second order undamped transfer function is cascaded to each input channel to increase the loop transfer function gain at the frequency of the input command. A feedback controller is then designed via the LQG/LTR method to stabilize the system while the loop gain remains large at the frequency of the input. The method is experimentally verified on a single axis servo system and extended to multivariable systems.

ISSN:0020-7179    

DOI:10.1080/00207179008934095

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor