Journal ArticleDOI
Optimisation of Turbo-Generator Transient Performance by Differential Dynamic Programming
S. Narayana Iyer,B. J. Cory +1 more
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In this paper, a more direct control of the stability can be achieved by regulating the power input to the turbine, which is achieved by simultaneous control of field excitation and the turbine.Abstract:
Methods which have been proposed for increasing the margin of stability in large generators generally act by controlling the generator electrical power output. A more direct control of the stability can be achieved by regulating the power input to the turbine. Simultaneous control of the field excitation and the turbineread more
Citations
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Journal ArticleDOI
A transformation for necessary optimality conditions for systems with polynomial nonlinearities
TL;DR: In this article, a new formulation means to obtain the optimal control for systems having polynomial nonlinearities by using functional analytic methods, and a new set of optimizing equations is obtained and the necessary and sufficient conditions are met by the positive definiteness requirement on the system matrix.
Journal ArticleDOI
Optimal control of a micro-alternator system
M.E. Newton,B.W. Hogg +1 more
TL;DR: In this paper, a model of a turbogenerator and associated computer system for on-line closed loop control is described, which is used to investigate the performauce of the generator with a linear optimal controller, which provides integrated control of governor and excitation systems.
Journal ArticleDOI
Brief paper: A two-level costate prediction algorithm for non-linear systems
TL;DR: A two level costate prediction algorithm is developed for the optimisation of non-linear discrete dynamical systems and is proved to converge under fairly mild conditions.
Proceedings ArticleDOI
A novel approach to coordination of large-scale systems; part I interaction prediction principle
TL;DR: In this paper, the concept of coordination is introduced within the framework of two-level large-scale systems, and two new approaches for coordination based on interaction prediction principle and interaction balance principle have been presented.
Journal ArticleDOI
Optimum Control of a Turbo-Generator Including an Exciter and Governor
S. Narayana Iyer,B. J. Cory +1 more
TL;DR: In this paper, a second-order optimisation algorithm was applied to a simple model of a turbo-alternator to determine the optimum control inputs under transient conditions, and a more detailed model including exciter and governor control loops.
References
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Journal ArticleDOI
A Second-order Gradient Method for Determining Optimal Trajectories of Non-linear Discrete-time Systems
TL;DR: In this article, a second-order method of successively improving a control sequence for a non-linear discrete-time system is derived, which is motivated by dynamic programming and facilitates the application of gradient methods to stochastic problems which will be the subject of a future paper.
Journal ArticleDOI
Optimization and Control of Nonlinear Systems Using the Second Variation
TL;DR: In this article, a feedback control scheme is described that maximizes a terminal quantity while satisfying specified terminal conditions, in the presence of small disturbances, and the scheme can also be used in a rapidly converging computation technique to find exact solutions to the nonlinear two point boundary value problems occurring in the calculus of variations.
Journal ArticleDOI
Improvement of System Stability by Switched Series Capacitors
TL;DR: In this paper, the authors analyzed the effect of switched series capacitors on the transient stability of a 2-circuit ac transmission link by using equal-area diagrams for two kinds of disturbances: 1) a permanent fault on one ac circuit, cleared by opening a section of that circuit, without reclosure and 2) a dc line operating in parallel with the ac line.
Journal ArticleDOI
Effect of High-Speed Rectifier Excitation Systems on Generator Stability Limits
TL;DR: In this paper, a device to provide a signal proportional to changes in generator speed has been developed by Ontario Hydro and field tests have been performed to demonstrate that use of this signal with a high-speed rectifier excitation system results in dynamic stability limits which approximate those which can be obtained with a zero reactance generator.
Journal ArticleDOI
General-purpose turbo-alternator model
TL;DR: In this article, the authors describe the development of a mathematical model which includes many of the features normally neglected in conventional network-analyser and digital-computer studies, such as mechanical and electrical damping, flux variations, iron saturation and saliency, and also permits the inclusion of voltage-regulator and governor action.