This paper is concerned with the problem of optimal daily scheduling of the electricity production by power system of thermal power plants. The problem and its model is closely related to the so called optimal unit co...
详细信息
This paper is concerned with the problem of optimal daily scheduling of the electricity production by power system of thermal power plants. The problem and its model is closely related to the so called optimal unit commitment problems. The main difference is that in our approach the transmission network is also taken into account. Beside the variables and constraints describing the production of the individual power plants there are also variables characterizing the state of the network. The constraints imposed bv the transmission system and the active power losses are also taken into consideration. A further difference is in the way in which we deal with the units of the power stations. Instead of the operation of single units we take always the feasible combined operations of the units of a power station into account. Time-dependent stillstand and restart costs are involved. A special type of constraint appearing in our problem is the so-called fuel constraint. This requires that in some power plants the daily overall production - directly connected with fuel consumption - should differ from a given value only to the extent of a very small percentage.
One of the most serious problems encountered in Naval steam plants following World War II was the unreliable performance of boiler and main feedpump pneumatic control systems. In addition to control component and syst...
One of the most serious problems encountered in Naval steam plants following World War II was the unreliable performance of boiler and main feedpump pneumatic control systems. In addition to control component and system design deficiencies, these control systems suffered from inadequate methods to measure and adjust system alignment. This paper describes the development of a set of procedures for on-line alignment verification (OLV) of pneumatic main boiler and feedpump control systems. The procedures are designed for use by N avy control system technicians and, in addition to on-line alignment verification, provide guidance for troubleshooting and for performing system alignment. Procedure static checks measure steady state steaming performance and OLV procedure dynamic checks measure the ability of the boiler and control systems to respond to load changes. The paper describes typical control system characteristics that influence OLV procedure content and the supporting analysis that was used to establish alignment criteria ranges that satisfy both steady state and transient performance requirements. Also described is the alignment criteria tolerance analysis along with the steps involved in a typical OLV check procedure development. Descriptions of the various OLV checks, troubleshooting procedures and alignment procedures are provided. Typical shipboard implementation requirements are described and experience to date with the procedures is provided along with a status report on OLV procedure implementations.
A new method is presented, whose main contribution is a new parametrization especially for structure seeking purposes. The ML method is applied for parameter estimation and special consideration is devoted to the eval...
详细信息
A new method is presented, whose main contribution is a new parametrization especially for structure seeking purposes. The ML method is applied for parameter estimation and special consideration is devoted to the evaluation of elementary subsystems constituting the model. Some illustrative examples are also shown.
Research of discrete event systems is strongly motivated by applications in flex ible manufacturing, in traffic control and in concurrent and real-time software verification and design, just to mention a few imp...
详细信息
ISBN:
(数字)9783034891202
ISBN:
(纸本)9783034899161
Research of discrete event systems is strongly motivated by applications in flex ible manufacturing, in traffic control and in concurrent and real-time software verification and design, just to mention a few important areas. Discrete event system theory is a promising and dynamically developing area of both control theory and computerscience. Discrete event systems are systems with non-numerically-valued states, inputs, and outputs. The approaches to the modelling and control of these systems can be roughly divided into two groups. The first group is concerned with the automatic design of controllers from formal specifications of logical requirements. This re search owes much to the pioneering work of P.J. Ramadge and W.M. Wonham at the beginning of the eighties. The second group deals with the analysis and op timization of system throughput, waiting time, and other performance measures for discrete event systems. The present book contains selected papers presented at the Joint Workshop on Discrete Event Systems (WODES'92) held in Prague, Czechoslovakia, on Au gust 26-28, 1992 and organized by the institute of Information Theory and Au tomation of the Czechoslovak Academy of sciences, Prague, Czechoslovakia, by the Automatic control Laboratory of the Swiss Federal institute of Technology (ETH) , Zurich, Switzerland, and by the Department of Computing science of the University of Groningen, Groningen, the Netherlands.
暂无评论