Francesco Casella

Improve voltage control in IEEE14Bus test cases

17

Voltage control in the IEEE14Bus test cases has some stability issues. In all the test cases where some perturbations of the voltage are applied, the AVRs eventually bring the voltages...

PowerGrids.Examples.Tutorial.IslandOperation.TwoGeneratorsLocalInitialization fails at initialization

1

Model PowerGrids.Examples.Tutorial.IslandOperation.TwoGeneratorsLocalInitialization fails at initialization, and was temporarily removed from the set that is tested by the OMC CI. Some analysis and comparisons was carried out on a reduced version...

Extend overconstrained connector semantics to allow runtime islanding and reconnection

2

The discussion in [OMC #6240 comment 2](https://trac.openmodelica.org/OpenModelica/ticket/6240#comment:2) puts forward a proposal for an extension of the current overconstrained connector semantics, that could be used to allow runtime islanding and reconnection...

Numerical problem at initialization when the AVR is saturated

1

The model in the tutorial that is initialized in steady-state with the AVR in saturation, `PowerGrids.Examples.Tutorial.GridOperation.Controlled.ControlledGridWithReferenceCalculationSat` fails because of [singular initialization](https://libraries.openmodelica.org/branches/master/PowerGrids/files/PowerGrids_PowerGrids.Examples.Tutorial.GridOperation.Controlled.ControlledGridWithReferenceCalculationSat.sim). This error was not caught in the past by...

As discussed during meeting on 14/05/2024

Clarification on positiveMax implementation

7

The sophisticated implementation of `positiveMax()` in [Section 15.2](https://specification.modelica.org/master/stream-connectors.html#instream-and-connection-equations) contains the following definition: ```modelica eps := relativeTolerance*min(nominal(mj.c.m_flow)); ``` It's not clear what is the meaning of `min(nominal(mj.c.m_flow))`. From what I remember,...

Models with experiment annotation that have parameters without bindings and without explicitly set start values in ThermoFluidStream

3

Dear ThermoFluidStream developers, please check the latest OpenModelica [regression test report](https://libraries.openmodelica.org/branches/history/master/2024-03-06%2022:42:24..2024-03-07%2022:25:06.html). There are a few ThermoFluidStream models that fail since we fixed ticket OpenModelica/OpenModelica#10386. According to the latest version of...

Specific start values should be used for categories of models

4

Default start values for pressures, enthalpies, temperatures, and flows are defined in completely generic base classes, such as, e.g., [Partial.BaseClasses.FlowModel](https://github.com/Metroscope-dev/metroscope-modeling-library/blob/5db093af04abb61d6969ac43d5e9d931c707b2c5/MetroscopeModelingLibrary/Partial/BaseClasses/FlowModel.mo#L10). These values are then not specialized to categories of models...

Systematically address convergence issues with direct and inverse models

1

The convergence of several non-trivial test cases in Metroscopia_NPP is fragile _with the currently provided default start attributes_. This means that changing the tool or even the version of the...

Remove unreliable signals very close to zero

3

These signals only depend on numerical approximations and CSV compare cannot evaluate them reliably because it lacks information about their magnitude (nominal attribute).