New nonlinear optimal controllers for a multimachine system are presented. Nonlinear field voltag... more New nonlinear optimal controllers for a multimachine system are presented. Nonlinear field voltage controllers (NFVC) are designed with the use of the feedback linearization approach to adjust generator state variables to external reference signals resulting from optimal power flow calculation in a stabilized power system. A nonlinear control law has been derived for the three-dimensional model of a generator. A new control strategy has been verified for a three machine power system. An extensive simulation study shows robustness of the nonlinear controllers and better performance than PSS-based classical controllers.
The process of inventory management can be recognized as an optimal allocation process when resou... more The process of inventory management can be recognized as an optimal allocation process when resources are allocated in spare parts purchase with the objective function maximizes the availability of a power plant. Managing large inventory items is a complex task as it involves hundreds of plant items. A need for decision supporting tools in managing large inventory items has been fulfilled by the development of Decision Support Systems (DSS) (1), (2). Despite the advantageous performance of these systems, the accuracy of the outcome decision still depends on the information supplied. This has become a major obstacle in the decision making process since historical records are often incomplete. This paper discusses fundamental problems of data uncertainty and attempts to formulate a methodology for the decision making process under data uncertainty. Alternative sources to retrieve unknown data are identified and the utilization of data from such sources is made possible by the use of t...
This paper discusses a set of criteria for a new definition of powers flowing into nonsinusoidal ... more This paper discusses a set of criteria for a new definition of powers flowing into nonsinusoidal circuits, to satisfy a set of criteria. This leads to a new concept of unidirectional, bidirectional and total power as a function of time and a new idea of effective power as the integral over the time. The idea presented is illustrated by a case study providing comparison with three existing power definitions. Although the concept presented does not solve ad problems with power definitions in nonsinusoidal circuits, it can be useful in some cases
Od początku lat 90. ubieglego wieku, kiedy to rząd Tadeusza Mazowieckiego, biorąc pod uwage olbrz... more Od początku lat 90. ubieglego wieku, kiedy to rząd Tadeusza Mazowieckiego, biorąc pod uwage olbrzymie koszty i brak akceptacji spolecznej, wstrzymal budowe elektrowni atomowej w Żarnowcu, w Polsce panowal rodzaj niepisanej umowy rządzących ze spoleczenstwem: rząd nie probuje budowac elektrowni atomowych – spoleczenstwo nie protestuje. Ukazywaly sie co prawda od czasu do czasu publikacje wzdychające do elektrowni atomowych. PSE SA, a poźniej ich nastepca Polska Grupa Energetyczna prowadzila prace studialne. W „Polityce energetycznej 2005–2025 roku” pojawil sie zapis o potrzebie ponownego rozwazenie energetyki jądrowej, a premier J. Kaczynski w swoim expose mgliście zapowiedzial budowe elektrowni atomowej, jednak malo kto bral to powaznie.
Abstract The paper deals with the problem of a robust optimal control with an observer for a sync... more Abstract The paper deals with the problem of a robust optimal control with an observer for a synchronous generator connected to a power system by a tie line. An additional proportional feedback allows to obtain a robustness of a system and the response properties are improved by the extended perfect model following system. Design examples are given and the system is simulated to exemplify the effectiveness of the presented method for a synchronous generator (S = 432 MVA).
New nonlinear optimal controllers for a multimachine system are presented. Nonlinear field voltag... more New nonlinear optimal controllers for a multimachine system are presented. Nonlinear field voltage controllers (NFVC) are designed with the use of the feedback linearization approach to adjust generator state variables to external reference signals resulting from optimal power flow calculation in a stabilized power system. A nonlinear control law has been derived for the three-dimensional model of a generator. A new control strategy has been verified for a three machine power system. An extensive simulation study shows robustness of the nonlinear controllers and better performance than PSS-based classical controllers.
The process of inventory management can be recognized as an optimal allocation process when resou... more The process of inventory management can be recognized as an optimal allocation process when resources are allocated in spare parts purchase with the objective function maximizes the availability of a power plant. Managing large inventory items is a complex task as it involves hundreds of plant items. A need for decision supporting tools in managing large inventory items has been fulfilled by the development of Decision Support Systems (DSS) (1), (2). Despite the advantageous performance of these systems, the accuracy of the outcome decision still depends on the information supplied. This has become a major obstacle in the decision making process since historical records are often incomplete. This paper discusses fundamental problems of data uncertainty and attempts to formulate a methodology for the decision making process under data uncertainty. Alternative sources to retrieve unknown data are identified and the utilization of data from such sources is made possible by the use of t...
This paper discusses a set of criteria for a new definition of powers flowing into nonsinusoidal ... more This paper discusses a set of criteria for a new definition of powers flowing into nonsinusoidal circuits, to satisfy a set of criteria. This leads to a new concept of unidirectional, bidirectional and total power as a function of time and a new idea of effective power as the integral over the time. The idea presented is illustrated by a case study providing comparison with three existing power definitions. Although the concept presented does not solve ad problems with power definitions in nonsinusoidal circuits, it can be useful in some cases
Od początku lat 90. ubieglego wieku, kiedy to rząd Tadeusza Mazowieckiego, biorąc pod uwage olbrz... more Od początku lat 90. ubieglego wieku, kiedy to rząd Tadeusza Mazowieckiego, biorąc pod uwage olbrzymie koszty i brak akceptacji spolecznej, wstrzymal budowe elektrowni atomowej w Żarnowcu, w Polsce panowal rodzaj niepisanej umowy rządzących ze spoleczenstwem: rząd nie probuje budowac elektrowni atomowych – spoleczenstwo nie protestuje. Ukazywaly sie co prawda od czasu do czasu publikacje wzdychające do elektrowni atomowych. PSE SA, a poźniej ich nastepca Polska Grupa Energetyczna prowadzila prace studialne. W „Polityce energetycznej 2005–2025 roku” pojawil sie zapis o potrzebie ponownego rozwazenie energetyki jądrowej, a premier J. Kaczynski w swoim expose mgliście zapowiedzial budowe elektrowni atomowej, jednak malo kto bral to powaznie.
Abstract The paper deals with the problem of a robust optimal control with an observer for a sync... more Abstract The paper deals with the problem of a robust optimal control with an observer for a synchronous generator connected to a power system by a tie line. An additional proportional feedback allows to obtain a robustness of a system and the response properties are improved by the extended perfect model following system. Design examples are given and the system is simulated to exemplify the effectiveness of the presented method for a synchronous generator (S = 432 MVA).
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