What do you mean by “ the original 24 bus network”? The only 24-bus model 
included in MATPOWER works fine ...

>> mpopt = mpoption('verbose', 2, 'out.all', 0);                  
>> mpc = loadcase('case24_ieee_rts');
>> runpf(mpc, mpopt);

MATPOWER Version 6.0, 16-Dec-2016 -- AC Power Flow (Newton)

 it    max P & Q mismatch (p.u.)
----  ---------------------------
  0         5.866e+00
  1         4.620e-01
  2         7.034e-03
  3         3.215e-06
  4         2.309e-12
Newton's method power flow converged in 4 iterations.

… even with all dispatchable loads …

>> runpf(load2disp(mpc), mpopt);

MATPOWER Version 6.0, 16-Dec-2016 -- AC Power Flow (Newton)

 it    max P & Q mismatch (p.u.)
----  ---------------------------
  0         5.835e+00
  1         4.179e-01
  2         7.121e-03
  3         7.778e-06
  4         8.849e-12
Newton's method power flow converged in 4 iterations.

— Ray


> On May 12, 2017, at 7:00 AM, Teh Jiashen <[email protected]> wrote:
> 
> I would like to add that I model all my load as negative generators
>  
> From: [email protected] 
> <mailto:[email protected]> 
> [mailto:[email protected] 
> <mailto:[email protected]>] On Behalf Of Teh Jiashen
> Sent: Friday, May 12, 2017 6:53 PM
> To: [email protected] <mailto:[email protected]>
> Subject: ACOPF not converge
>  
> Dear all, 
>  
> May I know why ACOPF for the original 24 bus network is not converging?
>  
> How do I solved this issue?
>  
> Thanks
> Jiashen

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