> >Dear Shri, >Thank you. >For each bus the jacobian is stored in the way you mentioned?
No. J = [dP1_dVa1 .. dP1_dVan dP1_dVm1 .. dP1_dVmn : : dPn_dVa1 .. dPn_dVan dPn_dVm1 .. dPn_dVmn dQ1_dVa1 .. dQ1_dVan dQ1_dVm1 .. dQ1_dVmn : : dQn_dVa1 .. dQn_dVan dQn_dVm1 .. dQn_dVmn ] For rows, all the real power mismatch equations are ordered first followed all the reactive power mismatch equations. For columns, all the voltage angles are first followed by voltage magnitudes. > >But how would I extract it, for example in the 9 bus system if I want the >4th element of each jacobian matrix for all 9 busses which elements will >this be in the full jacobian matrix? Please read some MATLAB tutorial on accessing elements from a matrix. Shri > >Hiranya >Sent from my iPhone > >> On 3 Jun 2015, at 02:26, "Abhyankar, Shrirang G." <abhy...@anl.gov> >>wrote: >> >> The Jacobian is stored in a sparse matrix format. The Jacobian values >>not >> displayed are all zeros. >> >> MATPOWER orders the Jacobian as follows: >> >> J = [dP_dVa dP_dVm >> dQ_dVa dQ_dVm] >> >> where P and Q are the real and reactive power mismatch equations and Va, >> Vm are the voltage angles and magnitudes of the buses. The size of the >> Jacobian is 2*nbus X 2*nbus where nbus is the number of buses. >> >> If you only want the sensitivities w.r.t. voltage magnitudes then >>extract >> the dQ_dVm sub-matrix from the Jacobian. >> >> >> Shri >> >> -----Original Message----- >> From: Hiranya Seneviratne <hiranya.seneviratn...@gmail.com> >> Reply-To: MATPOWER discussion forum <matpowe...@list.cornell.edu> >> Date: Tuesday, June 2, 2015 at 4:54 PM >> To: MATPOWER discussion forum <matpowe...@list.cornell.edu> >> Subject: Re: Jacobian matrix values >> >>> Dear Shri, >>> >>> Thanks a lot. I have tried finding the jacobian matrix when i ran the >>> power flow on case 9 in the example cases given in matlab. >>> I assigned fullJac to be = 1. >>> However, I obtained the following values for J: >>> J = >>> >>> (1,1) 17.1204 >>> (4,1) -17.1204 >>> (10,1) 0.7195 >>> (13,1) 0.7195 >>> (2,2) 15.8554 >>> (8,2) -15.8554 >>> (11,2) 1.6300 >>> (17,2) 1.6300 >>> (3,3) 17.1013 >>> (6,3) -17.1013 >>> (12,3) 0.8500 >>> (15,3) 0.8500 >>> (1,4) -17.1204 >>> (4,4) 38.2940 >>> (5,4) -10.0631 >>> (9,4) -10.9179 >>> (10,4) -0.7195 >>> (13,4) -3.2220 >>> (14,4) 2.1536 >>> (18,4) 1.6615 >>> (4,5) -10.1682 >>> (5,5) 15.3734 >>> (6,5) -5.5701 >>> (13,5) 1.5848 >>> (14,5) -3.9680 >>> (15,5) 0.6817 >>> (3,6) -17.1013 >>> (5,6) -5.3103 >>> (6,6) 32.3713 >>> (7,6) -9.6479 >>> (12,6) -0.8500 >>> (14,6) 1.8143 >>> (15,6) -2.4536 >>> (16,6) 1.3623 >>> (6,7) -9.6999 >>> (7,7) 22.9890 >>> (8,7) -13.5172 >>> (15,7) 0.9218 >>> (16,7) -3.6932 >>> (17,7) 0.8399 >>> (2,8) -15.8554 >>> (7,8) -13.3411 >>> (8,8) 35.1757 >>> (9,8) -5.4819 >>> (11,8) -1.6300 >>> (16,8) 2.3309 >>> (17,8) -2.7834 >>> (18,8) 1.9295 >>> (4,9) -11.0054 >>> (8,9) -5.8031 >>> (9,9) 16.3998 >>> (13,9) 0.9177 >>> (17,9) 0.3135 >>> (18,9) -3.5910 >>> (1,10) 0.7195 >>> (4,10) -0.7195 >>> (10,10) 17.6018 >>> (13,10) -17.1204 >>> (2,11) 1.6300 >>> (8,11) -1.6300 >>> (11,11) 16.1446 >>> (17,11) -15.8554 >>> (3,12) 0.8500 >>> (6,12) -0.8500 >>> (12,12) 17.0284 >>> (15,12) -17.1013 >>> (1,13) 0.7290 >>> (4,13) 3.2644 >>> (5,13) -2.1820 >>> (9,13) -1.6834 >>> (10,13) -17.3458 >>> (13,13) 38.7981 >>> (14,13) -10.1956 >>> (18,13) -11.0616 >>> (4,14) -1.6246 >>> (5,14) 2.2225 >>> (6,14) -0.6989 >>> (13,14) -10.4239 >>> (14,14) 15.1448 >>> (15,14) -5.7102 >>> (3,15) 0.8471 >>> (5,15) -1.8082 >>> (6,15) 2.4453 >>> (7,15) -1.3577 >>> (12,15) -17.0438 >>> (14,15) -5.2924 >>> (15,15) 32.2624 >>> (16,15) -9.6154 >>> (6,16) -0.9353 >>> (7,16) 1.7179 >>> (8,16) -0.8521 >>> (15,16) -9.8411 >>> (16,16) 22.6136 >>> (17,16) -13.7140 >>> (2,17) 1.6362 >>> (7,17) -2.3398 >>> (8,17) 2.7940 >>> (9,17) -1.9369 >>> (11,17) -15.9161 >>> (16,17) -13.3922 >>> (17,17) 35.3104 >>> (18,17) -5.5029 >>> (4,18) -0.9583 >>> (8,18) -0.3274 >>> (9,18) 1.1393 >>> (13,18) -11.4924 >>> (17,18) -6.0599 >>> (18,18) 16.0813 >>> >>> >>> >>> I was wondering why some of the values are missing and why it is an >>>18*18 >>> matrix. >>> >>> What I want is J4 for each bus, in order to find the voltage >>>sensitivity. >>> I will be extremely grateful if you could please help me out as my >>> project deadline is next week. >>> >>> Thank you >>> Hiranya >>>> On 2 Jun 2015, at 17:08, Abhyankar, Shrirang G. <abhy...@anl.gov> >>>>wrote: >>>> >>>> fullJac is a flag that you can set to either access the full Jacobian >>>> matrix or a partial Jacobian. With fullJac = 1, the routine returns >>>>the >>>> full Jacobian that has partial derivatives of the power flow equations >>>> w.r.t to the voltage magnitudes and angles at all buses. If fullJac = >>>>0 >>>> or >>>> not given, the Jacobian as used for the power flow calculation, i.e., >>>> Jacobian ignoring reactive power equations and voltage magntidues at >>>>PV >>>> buses, real, reactive power equations, voltage magnitudes and angles >>>>at >>>> swing buses. >>>> >>>> Shri >>>> >>>> -----Original Message----- >>>> From: Hiranya Seneviratne <hiranya.seneviratn...@gmail.com> >>>> Reply-To: MATPOWER discussion forum <matpowe...@list.cornell.edu> >>>> Date: Tuesday, June 2, 2015 at 10:44 AM >>>> To: MATPOWER discussion forum <matpowe...@list.cornell.edu> >>>> Subject: Re: Jacobian matrix values >>>> >>>>> Thank you. >>>>> However what is fulljac? As I am unable to find the value for that. >>>>> Thank you >>>>> >>>>> Sent from my iPhone >>>>> >>>>>> On 2 Jun 2015, at 16:29, "Abhyankar, Shrirang G." <abhy...@anl.gov> >>>>>> wrote: >>>>>> >>>>>> >>>>>> >>>>>>http://www.pserc.cornell.edu//matpower/docs/ref/matpower5.1/makeJac.h >>>>>>tm >>>>>> l >>>>>> >>>>>> >>>>>> -----Original Message----- >>>>>> From: Hiranya Seneviratne <hiranya.seneviratn...@gmail.com> >>>>>> Reply-To: MATPOWER discussion forum <matpowe...@list.cornell.edu> >>>>>> Date: Tuesday, June 2, 2015 at 4:04 AM >>>>>> To: MATPOWER discussion forum <matpowe...@list.cornell.edu> >>>>>> Subject: Jacobian matrix values >>>>>> >>>>>>> Dear Ray, >>>>>>> Is it possible to find out the values of the jacobian matrix once >>>>>>>the >>>>>>> power flow is calculated in Matpower? >>>>>>> Thank you >>>>>>> Hiranya >>>>>>> >>>>>>> Sent from my iPhone >> >> >> > >