{"title":"Novel prediction methods applied to voltage controls","authors":"T. Godart, H. Puttgen","doi":"10.1109/CDC.1990.203337","DOIUrl":"https://doi.org/10.1109/CDC.1990.203337","url":null,"abstract":"Two methods which assist voltage control decisions by predicting the impact of voltage controllers on power system voltages are discussed. Both methods offer possibilities for voltage control studies and are particularly adapted to expert system implementations. First, control regions are readily determined using rule-based searches among the electric system topology and based on initial reactive power flows. Second, sensitivities of voltages with respect to controls are computed using adjoint-network-based voltage predictions which do not require Jacobian computations and which are well adapted to admittance switching actions. These methods are used in the framework of an expert system currently being developed by the authors. The theories and implementations of both methods are discussed, and results using the IEEE-118 power system are presented.<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131826356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A new class of gradient estimators for queueing systems with real-time constraints","authors":"W. Gong, C. Cassandras, M. Kallmes, Y. Wardi","doi":"10.1109/CDC.1990.203719","DOIUrl":"https://doi.org/10.1109/CDC.1990.203719","url":null,"abstract":"Queuing systems are considered where the waiting or sojourn times of customers are constrained by specified deadlines. A performance measure of interest in these systems is the probability that a customer exceeds its assigned deadline. A new class of gradient estimators is presented for such performance measures with respect to various system parameters. The approach is applicable to a general class of problems and is based on efficiently capturing sensitivity information for probabilities of event occurrences from observed sample paths.<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132965258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Generalized balanced stochastic truncation","authors":"M. Green, Brian D. O. Anderson","doi":"10.1109/CDC.1990.203644","DOIUrl":"https://doi.org/10.1109/CDC.1990.203644","url":null,"abstract":"A modification of the balanced stochastic truncation method for relative error model reduction is introduced. The method is shown to satisfy an infinity norm bound on the relative error between the full order and the reduced order models. The discrete time balanced stochastic truncation algorithm is at the heart of the new method, and a relative error bound for this algorithm is derived.<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"189 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132600875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Constrained motion of grasped objects by hybrid control","authors":"A. A. Cole","doi":"10.1109/CDC.1990.203964","DOIUrl":"https://doi.org/10.1109/CDC.1990.203964","url":null,"abstract":"The author considers the control of an object, grasped by a multifingered hand, which is constrained (at a point) to follow some frictionless surface. Using the surface description, orthogonal position-controlled and force-controlled subspaces, together with their relevant parameters, are defined. By analyzing all the kinematic constraints on the grasped object, the author derives the dynamic equation for the total constrained system in terms of the surface parameters and force parameters. Finally, a hybrid control scheme for the hand is proposed which allows a fixed point on the object to track a prespecified position trajectory on the surface while exerting a desired normal force.<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130752509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Nonlinear dynamic disturbance decoupling","authors":"H. Huijberts, H. Nijmeijer, L. van der Wegen","doi":"10.1109/CDC.1990.203431","DOIUrl":"https://doi.org/10.1109/CDC.1990.203431","url":null,"abstract":"The authors introduce the dynamic disturbance decoupling problem for nonlinear systems. A local solution of the problem is given. A compensator solving the problem can be obtained by means of S.N. Singh's (1981) algorithm.<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133297251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Z. Michalewicz, J. Krawczyk, M. Kazemi, C. Janikow
{"title":"Genetic algorithms and optimal control problems","authors":"Z. Michalewicz, J. Krawczyk, M. Kazemi, C. Janikow","doi":"10.1109/CDC.1990.203904","DOIUrl":"https://doi.org/10.1109/CDC.1990.203904","url":null,"abstract":"The application of the genetic algorithm to discrete-time optimal control problems is studied. The numerical results obtained are compared with a system for construction and solution of large and complex mathematical programming models, GAMS. It is shown that while GAMS appears to work well only for linear-quadratic optimal control problems or problems with a short horizon, the genetic algorithm applies to more general problems and appears to be competitive with search-based methods.<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133300999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Long range predictive control of arterial blood pressure","authors":"K. kwok, A. Clanachan, B. Finegan, S. L. Shah","doi":"10.1109/CDC.1990.203287","DOIUrl":"https://doi.org/10.1109/CDC.1990.203287","url":null,"abstract":"A multistep adaptive predictive controller has been experimentally evaluated for control of blood pressure. The purpose of this controller is to control the mean arterial pressure under hypertensive conditions, using sodium nitroprusside to maintain the pressure at a desired lower level. The development of the controller makes use of a real-time multitasking software environment which allows operators to make changes on-line. Experiment results show that the controller is efficient in both set point tracking and regulatory control. Its long-range predictive nature also makes the system more robust in dealing with unknown and varying time delay as well as nonminimum phase processes.<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133675579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fundamental theorem of linear state feedback for singular systems","authors":"K. Ozcaldiran","doi":"10.1109/CDC.1990.203548","DOIUrl":"https://doi.org/10.1109/CDC.1990.203548","url":null,"abstract":"The problem is solved of simultaneously assigning the finite and infinite eigenstructure of the controllable singular system Ex'(t)=Ax(t)+Bu(t) by the proportional state feedback law u(t)=Fx(t). Given m monic polynomials d/sub 1/(s), . . .,d/sub m/(s) of degrees d/sub 1/,. . ., d/sub m/ satisfying d/sub i+1/(s) mod d/sub i/(s), and eta ( eta =nullity of E) nonnegative integers p/sub 1/, . . .,p eta d/sub 1/+. . .+d/sub m/+p/sub 1/+p/sub eta /=rank E, necessary and sufficient conditions are established for the existence of a real feedback map F so that the d/sub i/(s)'s are the invariant polynomials and the p/sub i/'s are the infinite pole orders of the closed-loop system Ex'(t)=(A+BF)x(t).<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132582002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On dynamic feedback linearization in R/sup 4/","authors":"J. Lévine, R. Marino","doi":"10.1109/CDC.1990.203992","DOIUrl":"https://doi.org/10.1109/CDC.1990.203992","url":null,"abstract":"The authors discuss the problem of dynamic feedback linearization for a nonlinear system in R/sup 4/ with two independent controls: the problem is to determine a dynamic compensator so that the closed loop can be expressed as a linear controllable system in suitable local coordinates in the extended state space. The results so far available give a complete characterization of control systems in R/sup 3/ and of control systems in which the number of independent controls is equal to the number of states minus one. For general systems necessary and sufficient conditions have been given, but examples in R/sup 4/ with two controls already show a gap between necessity and sufficiency. This gap is discussed.<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132646699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optimality of threshold policies for heterogeneous server systems","authors":"P. Luh, I. Viniotis","doi":"10.1109/CDC.1990.203714","DOIUrl":"https://doi.org/10.1109/CDC.1990.203714","url":null,"abstract":"The problem of optimally controlling a multiserver queuing system is studied. Arriving customers join a single queue, which is served by N servers, S/sub 1/, S/sub 2/, . . ., S/sub N/. The servers are exponential, but of different rates. The goal is to determine the policy that minimizes the total expected time a customer spends in the system. It is shown that the optical policy is of threshold type, i.e., it activates server S/sub i/ only when m/sub i/ does not depend on the condition of other (slower) servers at the decision instant. The optimal control problem is reformulated as a linear program and a novel argument is used based on the structure of the constraint matrix, in order to establish the results.<<ETX>>","PeriodicalId":287089,"journal":{"name":"29th IEEE Conference on Decision and Control","volume":"174 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133161252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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