Re: Matrix is singular to working precision.

, Sabhan Kanata menulis: Dear Prof Ray.. How do I check with the case_info command, sir? Please the instructions myfiledata : casejawabali.m RegardsSabhan Pada Senin, 21 Oktober 2019 22.23.34 WIB, Ray Zimmerman menulis: Did you check the output of case_info() for your case?   Ray

Re: Matrix is singular to working precision.

10:04 AM, Sabhan Kanata wrote: > > Dear Prof Ray, > > Thank you for responding > My branch data, There are no R and X parameters that are 0.  Where do you > think the problem is? > > " OutmailID: 124038130, List: 'matpower-l', MemberID: 28632318 SCRIPT: "bran

Re: Matrix is singular to working precision.

to see if you see anything unusual.     Ray On Oct 20, 2019, at 11:59 PM, Sabhan Kanata wrote: Dear Prof Ray, I get a warning when running the power flow as below: What do you think is the solution? Error using  \ Matrix is singular to working precision. Error in newtonpf (line 100)    dx

Matrix is singular to working precision.

Dear Prof Ray, I get a warning when running the power flow as below: What do you think is the solution? Error using  \ Matrix is singular to working precision. Error in newtonpf (line 100)    dx = -(J \ F); Error in runpf (line 148)     [V, success, iterations] = newtonpf(Ybus, Sbus,

Re: ORPF on the Case 118

This is an example for defining variables Hope you can be helped [PLOSS] = runpf(casename,AA) the reactive power source installation bus(5,6)=2*AA(55); bus(34,6)=2*AA(56); bus(37,6)=2*AA(57); bus(44,6)=2*AA(58); bus(45,6)=2*AA(59); bus(46,6)=2*AA(60); bus(48,6)=2*AA(61);

Re: the previous iteration that was overwritten

of the results struct for the best solution so far, replacing it each time you find an improved solution. Then at the end, use printpf() to re-print the output of the best solution.    Ray On Sep 18, 2019, at 10:11 PM, Sabhan Kanata wrote: Dear Prof Ray Zimmerman, I did the optimization process using

Re: the previous iteration that was overwritten

September 2019 20.21.56 WIB, Ray Zimmerman menulis: Use the printpf() function to print the results of a previously run solution that you’ve saved in a results struct. For example … results = runpf('case118');...printpf(results); Hope this helps,     Ray On Sep 18, 2019, at 5:50 AM, Sabhan Kanata

the previous iteration that was overwritten

Dear Prof Ray Zimmerman, How to display the entire matpower power flow in the matlab command from the previous iteration that was overwritten? Thanks RegardsSabhan K

Discrete variable

Dear Prof. Ray and matpower discussion forum How can I implement the ratio tap trafo as discrete variable (not fixed or continue variable) in MATPOWER runpf ? I want to implement matpower to calculate losses in heuritic optimization Regards Sabhan

The voltage stabilty index in power system

Dear Prof. Ray Zimmerman I am taking a reseach on Optimazation of Power System to investigate the way to minimalize the voltage stabilty index (Lindex). Has there been a calculation in searching for Lindex in Matpower? Thanks youSabhan

Re: Change objective function of losses to deviation Voltage

= runpf(mpc);total_losses = sum(get_losses(results));sum_of_V_deviations = sum(abs(results.bus(:, VM) - 1.0)); Hope this helps,     Ray  On Jul 28, 2018, at 12:03 AM, Sabhan Kanata wrote: Dear Mr. Ray Zimmerman, I am Sabhan Kanata,  a Doctoral Student of Bandung Institute of Technology

Update runpf to formula voltage deviation, not PLOSS

Dear Ray Zimmerman, if function [PLOSS] = runpf(casename,AA)To find the value of the function of the voltage deviation on the load bus : deviation voltage = (IVi-1.0I) how to update runpf coding? Thank youSabhan K