id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
5806	Initialization with homotopy and --daeMode does not generate initial-lambda0 equations	Francesco Casella	Karim Adbdelhak	"When the homotopy operator is used, a separate set of intial equations, labelled as {{{initial-lambda0}}} in the equations browser of the transformational debugger, is generated to solve the simplified system corresponding to {{{lambda = 0}}}, where {{{lambda}}} is the homotopy parameter. This is done in order to exploit the structural simplifications induced by the simplified expressions in the model, which help achieve convergence at the initialization of the homotopy process.

Unfortunately this step is skipped when {{{--daeMode}}} is activated. This is problematic for all the power grids models that need to be solved with that strategy. The attached model demonstrates the issue.

I may be unaware of some technical implementation details, but as far as I understand, the initialization phase is exactly the same whether the dynamic equations are solved with {{{odeMode}}} or {{{daeMode}}}. I guess when {{{daeMode}}} was implemented Willi didn't care about this aspect, but porting it from {{{odeMode}}} should be easy.

Could you please do that?

Thank you!"	defect	closed	critical	1.17.0	Run-time		fixed		Karim Adbdelhak Andreas Heuermann Andrea.bartolini adrien.guironnet@…