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
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,$T_R = 0$ 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.
IEEET1supportsDescription
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: