Dear Shri,
Thank you.
For each bus the jacobian is stored in the way you mentioned?
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?
Hiranya
Sent from my iPh
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 magnitude
This is what I used in order to find the jacobian values.
loadcase('case9')
x = runpf(case9)
fullJac = 1;
[J, Ybus, Yf, Yt] = makeJac(x.baseMVA, x.bus, x.branch, x.gen, fullJac)
On 2 Jun 2015, at 17:08, Abhyankar, Shrirang G. wrote:
> fullJac is a flag that you can set to either access the ful
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)
Dear Dr. Zimmerman,
When the OPF solution do not converge (because of excess load compared to
generation or transmission line power limits), I wish to have a load shedding
so that the OPF gives a solution. What is the best way to achieve load shedding
in Matpower?
Thank You,
Nandu Balachandra
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,
load p.f. = cos(atan(Q/P)).
By changing the P and Q values, you should be able to set the desired
power factor.
Shri
-Original Message-
From: Hiranya Seneviratne
Reply-To: MATPOWER discussion forum
Date: Tuesday, June 2, 2015 at 10:43 AM
To: MATPOWER discussion forum
Subject: Re: Powe
Dear Shri,
Thanks a lot. Is it possible to change the power factor as well?
I thought only the magnitudes of p and q can be changed in that manner?
Thank you
Sent from my iPhone
> On 2 Jun 2015, at 16:31, "Abhyankar, Shrirang G." wrote:
>
> Before running the power flow, you can change the
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." wrote:
>
> http://www.pserc.cornell.edu//matpower/docs/ref/matpower5.1/makeJac.html
>
>
> -Original Message-
> From: Hiran
Before running the power flow, you can change the load P and Q values in
the bus data.
Shri
-Original Message-
From: Hiranya Seneviratne
Reply-To: MATPOWER discussion forum
Date: Tuesday, June 2, 2015 at 6:17 AM
To: MATPOWER discussion forum
Subject: Power factor
>Dear Ray,
>
>Is it
http://www.pserc.cornell.edu//matpower/docs/ref/matpower5.1/makeJac.html
-Original Message-
From: Hiranya Seneviratne
Reply-To: MATPOWER discussion forum
Date: Tuesday, June 2, 2015 at 4:04 AM
To: MATPOWER discussion forum
Subject: Jacobian matrix values
>Dear Ray,
>Is it possible to
Dear Ray,
Is it possible to change the load power factor in matlab when running a power
flow simulation?
Thank you
Hiranya
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
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