how to solve the error regarding constraint relax in linear analysis tool

I am using Linear Analysis Tool to find the linearized state space model for any power system model. I took the snapshot at t=2, It creates a op_snapshot1 variable in linear analysis workspace and I trim the model; I got the following error:

" Optimizing to solve for all desired dx/dt=0, x(k+1)-x(k)=0, and y=ydes.

(Maximum Error) Block --------------------------------------------------------- (3.74474e+02) power_wind_dfig/Plant 2 MVA/1.68 MW 0.93 PF 2300 V/Mechanical model/Phasor Tm input/Rotor angle thetam (3.74474e+02) power_wind_dfig/Plant 2 MVA/1.68 MW 0.93 PF 2300 V/Mechanical model/Phasor Tm input/Rotor angle thetam

*Could not find a solution that satisfies all constraints. Relax the constraints to find a feasible solution._***

An operating point op_trim1 has been added to Linear Analysis Workspace."

Kindly help to how to solve the error.

Thanx in advance. Regards Kiran Gajrani

[Arkadiy Turevskiy]

It is hard to say what is happening without knowing what exactly you are doing. How are you specifying trimming conditions -i.e., which states should be at steady state, which state values should be fixed to known values? Are the specs you are asking for realistic and feasible?

Why can't you use a snapshot as your operating point for linearization?

Have you read this doc page and tried the suggestions?

Answer 1

[Arkadiy Turevskiy]

It is hard to say what is happening without knowing what exactly you are doing. How are you specifying trimming conditions -i.e., which states should be at steady state, which state values should be fixed to known values? Are the specs you are asking for realistic and feasible?

Why can't you use a snapshot as your operating point for linearization?

Have you read doc page and tried the suggestions?

Answer 2

[Veeranna]

I am using Linear Analysis Tool to find the linearized state space model for any power system model. I took the snapshot at t=2, It creates a op_snapshot1 variable in linear analysis workspace and I trim the model; I got the following error:

" Optimizing to solve for all desired dx/dt=0, x(k+1)-x(k)=0, and y=ydes.

Optimizing to solve for all desired dx/dt=0, x(k+1)-x(k)=0, and y=ydes.

(Maximum Error) Block

---------------------------------------------------------

(3.46837e+05) GSC_dq_KURUVA/Subsystem/Integrator1

(3.46837e+05) GSC_dq_KURUVA/Subsystem/Integrator1

Could not find a solution that satisfies all constraints. Relax the constraints to find a feasible solution.

An operating point op_trim1 has been created.

*Could not find a solution that satisfies all constraints. Relax the constraints to find a feasible solution._***

Kindly help to how to solve the error.

@ Please find the screen shot for operating points.