Re: generate a new case file

Carlos E Murillo-Sanchez Tue, 31 Jan 2017 11:37:28 -0800

With the loading pattern in your network, it is simply not possible to attain the voltage levels that you want without using some sort of voltage compensation at one or more locations. Even setting the voltage setpoint of the source at 1.1 p.u., the resulting voltages are:

================================================================================
|     Bus Data                                                                 |
================================================================================
Bus      Voltage          Generation             Load
#   Mag(pu) Ang(deg)   P (MW)   Q (MVAr)   P (MW)   Q (MVAr)
----- ------- -------- -------- -------- -------- --------
    1 1.100    0.000*    31.33     20.53       -         -
    2 0.958   -2.552       -         -         -         -
    3 0.939   -2.770       -         -         -         -
    4 1.060   -0.783       -         -        2.00      1.60
    5 1.025   -1.566       -         -        3.00      1.50
    6 1.054   -1.014       -         -        2.00      0.80
    7 1.053   -1.020       -         -        1.50      1.20
    8 0.958   -2.552       -         -        4.00      2.70
    9 0.975   -2.217       -         -        5.00      3.00
   10 0.946   -2.670       -         -        1.00      0.90
   11 1.011   -1.742       -         -        0.60      0.10
   12 0.969   -2.420       -         -        4.50      2.00
   13 0.939   -2.770       -         -        1.00      0.90
   14 0.937   -2.807       -         -        1.00      0.70
   15 0.942   -2.711       -         -        1.00      0.90
   16 0.941   -2.739       -         -        2.10      1.00
                        -------- -------- -------- --------
               Total:     31.33     20.53     28.70     17.30

Carlos.

siddique tomal wrote:

Dear Ray,
Thanks for reply. Actually I just needed the load flow with facility of voltage constraints but later on I found that it's not possible in normal load flow that's why I'm now interested in opf. it provides the facility of voltage constraints. And my voltage constraints limit is 0.95-1.05 . but now you're saying to set bus voltage at 0.85 which is lower than lower constraint value. I would be so much grateful to you if you kindly say if there is any other way to accomplish my demand.

Thanks

On Jan 31, 2017 11:34 PM, "Ray Zimmerman" <[email protected]> wrote:

The problem is not feasible due to voltage constraints. Notice that voltages in the power flow solution go as low as 0.813 p.u., but your case includes OPF lower bounds on voltages at every bus of 0.95 p.u. Relaxing those voltage constraints allows the OPF to converge.

define_constants;

mpc = loadcase('case_radial16');

mpc.bus(:, VMIN) = 0.85;

r = runopf(mpc);

Ray

On Jan 31, 2017, at 9:55 AM, siddique tomal <[email protected]> wrote:

Dear Ray,
Thanks for your reply. I have prepared a 16 bus system. The power flow program runs OK with that but when I go for Optimal Power Flow it shows it did not convergence. I have attached the file below here. Please would you check the file and direct me what to change ? Waiting to hear from you.

Thanks

On Jan 6, 2017 1:33 AM, "Ray Zimmerman" <[email protected]> wrote:

See Section 2.3.1 and Appendix B in the User’s Manual. It’s probably easiest to start with an existing case file and modify it for your data. Let us know if you have a specific question about the case format.

Ray

On Jan 2, 2017, at 12:33 PM, siddique tomal <[email protected]> wrote:

Dear all,

i need to create a new case file of 16 bus system. i have attached the data table i have now. but my asking is how can i develop a new case file with the following data. its important to mention that the system baseMVA is 100 MVA and base kva of 23 kV.

Thanks to all.

<16 bus data.png>

<case_radial16.m>

Re: generate a new case file

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