Changes between Version 6 and Version 7 of Ticket #6240, comment 2
- Timestamp:
- 2021-10-14T09:45:08Z (3 years ago)
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Ticket #6240, comment 2
v6 v7 1 1 The overconstrained connector semantics defined in Section [https://specification.modelica.org/master/connectors-and-connections.html#equation-operators-for-overconstrained-connection-based-equation-systems1 9.4] of Modelica 3.5 considers a fixed connection graph, that can be handled statically at compile time. 2 2 3 One of the cited examples for overconstrained types in connectors is the phase information in AC power systems. The current semantics is able to represent synchronous systems whose topology remains unchanged during simulation. The phase reference is generated by one component of the synchronous system ( normally a large synchronous generator) and distributed throughout the entire synchronous system via the overconstrained connector variables. In fact, it is possible to have multiple synchronous systems in the same Modelica model, that correspond to structurally disconnected connections sub-graphs, e.g. two national grids connected by an undersea DC link, but in any case their topology is fixed at runtime.3 One of the cited examples for overconstrained types in connectors is the phase information in AC power systems. The current semantics is able to represent synchronous systems whose topology remains unchanged during simulation. The phase reference is generated by one component of the synchronous system (either an infinite bus, or a large synchronous generator for islanded systems) and distributed throughout the entire synchronous system via the overconstrained connector variables. In fact, it is possible to have multiple synchronous systems in the same Modelica model, that correspond to structurally disconnected connections sub-graphs, e.g. two national grids connected by an undersea DC link, but in any case their topology is fixed at runtime. 4 4 5 5 When modelling AC trasmission systems, is is possible that in case of severe perturbations, some key circuit breakers are switched open (i.e., their admittance brought to zero), effectively splitting a single synchronous system into multiple synchronous islands. Note that this requires no structural changes in the grid equations, only to set some admittance values to zero.
