problem while solving CPF in psat toolbox

how to sort out the error"Max # of iters. at corrector step. * Reduced Variable Increments in Corrector Step 0.5" in psat toolbox in matlab

[billal taiebsoliman]

DID YOU SOLV THAT PROBLEM

[billal taiebsoliman]

NEED HELP

[Kalyani Kulkarni]

yes sir i need help. . didnt solve this issue.

[billal taiebsoliman]

i have the sam problem

Answer 1

[Akanksha]

Hey @Kalyani Kulkarni,

It looks like the CPF solver in PSAT is struggling to converge during the corrector step—basically, it’s hitting the max number of iterations even after trying to take smaller steps. This usually points to either data or system issues, or sometimes just tough convergence. Here are a few things you can try:

1. Double-check your data: Make sure all your bus, generator, load, and line data are complete and realistic. Missing or incorrect values can cause convergence problems.
2. Improve initial guesses: Sometimes, giving the solver better starting values for voltages and angles helps.
3. Adjust solver settings: Try increasing the maximum number of iterations (e.g., Settings.PFmax = 50) or loosening the convergence tolerance (e.g., Settings.PFtol = 1e-4).
4. Check for islands: Ensure your network is fully connected—no isolated buses or islands.
5. Reduce system stress: If your system is heavily loaded or close to voltage collapse, try reducing some loads or generation to see if it helps.
6. Flat start: Set all voltages to 1.0 p.u. and angles to zero as a starting point and see if that makes a difference.
7. Look for singularities: Check that no buses are disconnected and all elements are properly modelled.

If you keep having trouble, try these steps one by one, and if possible, share your specific case data for more targeted help.

Hope this helps!