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Beschreibung
Summary
Track PhasorDynamics models whose state equations are not in explicit derivative form, especially parameter-switched cases where a state can become algebraic.
Rationale
In #439, IEEET1 supports $T_R = 0$ by retagging $V_{ts}$ as algebraic. That works for fully implicit DAE residuals, but can block future Hessenberg-form solvers that need separate differential right-hand-side and algebraic residual methods.
Description
Define a convention for these parametrically piecewise models, then update each affected model so it has a Hessenberg-compatible representation.
Models to cover:
Additional information
Any changes would be mostly mechanical tasks; unclear what the final desired algebraic/differential variant implementation looks like at this time.
We also need to determine:
- how to document conditionally algebraic states/equations
- how to reduce the count of duplicate equations if we have multiple variations of each model