This paper summarizes 20 year of experience by the authors with the ThermoPower library, an open-source Modelica library containing basic components for the dynamic modelling of thermal power generation processes, ori...
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This paper summarizes 20 year of experience by the authors with the ThermoPower library, an open-source Modelica library containing basic components for the dynamic modelling of thermal power generation processes, oriented to control studies. The structure and design principles of the library are reviewed, alongside several successful applications of it to various kinds of thermal power generation systems. Copyright (C) 2024 The Authors. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0/)
Two different object-orientedmodeling approaches, DEVS and EMSY, constitute the background to explore the area of variable structure modeling. Realizations of various kinds of structural changes are discussed in both...
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Two different object-orientedmodeling approaches, DEVS and EMSY, constitute the background to explore the area of variable structure modeling. Realizations of various kinds of structural changes are discussed in both approaches. Against the background of their prime application domains, both approaches deal with the problem of structural change differently. While DEVS emphasizes intelligent control of structural change, EMSY stresses the autonomous character of the system. Like autonomy and control, holism and reductionism play different roles in both approaches and affect the realization of structural changes. However, unlike the former which tend to transcend each other, the reductionistic and holistic view realized in the two modeling approaches prove to set a rigorous framework for variable structure modeling.
We present a parallel, hierarchical, modular Discrete Event System Specification (P-DEVS) modeling formalism which provides a modeler with both conceptual and parallel execution benefits. The parallel formalism distin...
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We present a parallel, hierarchical, modular Discrete Event System Specification (P-DEVS) modeling formalism which provides a modeler with both conceptual and parallel execution benefits. The parallel formalism distinguishes between transition collisions and ordinary external events in the external transition function of DEVS models. Such separation enables us to extend the modeling capability of the collisions. The formalism also does away with the necessity for tie-breaking of simultaneously scheduled events, as embodied in the select function. We next present a design for the parallel simulation procedures needed to prove the formalism's soundness and to serve as a reference for implementation. We then discuss a prototype implementation that affords a high degree of flexibility by mechanizing the ''closure under coupling'' property of the Parallel DEVS formalism and the object-oriented characteristics.
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