id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
6232	Questionable tearing in PowerSysPro leads to initialization failure	Francesco Casella	Karim Adbdelhak	"Please check [https://libraries.openmodelica.org/branches/newInst/PowerSysPro/files/PowerSysPro_PowerSysPro.Examples.OneProdLoadOneLineOneLineOneLoad.sim PowerSysPro.Examples.OneProdLoadOneLineOneLineOneLoad]. The initialization fails because of a division by zero in a torn equation.
The zero term is {{{line2.Y.re}}}, which depends on {{{line2.G = 0}}}. 

This choice of parameter is perfectly legitimate, the line is purely resistive and has zero shunt admittance, which should lead to a solvable system of equations. In fact, by setting {{{--tearingMethod=noTearing}}} the system can be initialized successfully.

I guess we should improve the tearing algorithm to avoid this kind of situation. This may actually have a positive influence on other failing models in the testsuite."	defect	new	blocker	1.17.0	Backend	1.16.0