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

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kiran
kiran 2013-2-23
回答： Veeranna 2023-6-19
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
  1 个评论
Arkadiy Turevskiy
Arkadiy Turevskiy 2013-3-12
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?

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回答（2 个）

Arkadiy Turevskiy
Arkadiy Turevskiy 2013-9-27
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?
Veeranna
Veeranna 2023-6-19
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.

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