>
>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." <[email protected]>
>>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 <[email protected]>
>> Reply-To: MATPOWER discussion forum <[email protected]>
>> Date: Tuesday, June 2, 2015 at 4:54 PM
>> To: MATPOWER discussion forum <[email protected]>
>> 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. <[email protected]>
>>>>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 <[email protected]>
>>>> Reply-To: MATPOWER discussion forum <[email protected]>
>>>> Date: Tuesday, June 2, 2015 at 10:44 AM
>>>> To: MATPOWER discussion forum <[email protected]>
>>>> 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." <[email protected]>
>>>>>> wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>http://www.pserc.cornell.edu//matpower/docs/ref/matpower5.1/makeJac.h
>>>>>>tm
>>>>>> l
>>>>>>
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Hiranya Seneviratne <[email protected]>
>>>>>> Reply-To: MATPOWER discussion forum <[email protected]>
>>>>>> Date: Tuesday, June 2, 2015 at 4:04 AM
>>>>>> To: MATPOWER discussion forum <[email protected]>
>>>>>> 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
>>
>>
>>
>
>
