Hey Scott,
to 1)
I have had similar Problems. Matpower only recognizes Limits if you run
an optimal Power Flow (rundcopf in your case, don't forget to set the
generator costs)
and as santiago said, if there is not enough power, the problem won't
converge. (in my case I limited the branches and got some very very
strange results (not converged), so unfortunately matpower was not the
tool for me.
to 2)
maybe the fact that there is no solution as way of recognizing?
christian
Am 08.05.2014 22:50, schrieb Scott Proper:
This partially answers my question. Note that I am using a DC power
flow for right now, not an AC flow or OPF.
So my questions remain:
1) How can I modify case14.m (or any similar problem) to cause this to
happen? Currently Matpower doesn't seem to recognize Pmax on generators.
2) I need some way of recognizing when this has happened in a
simulation and calculating the result. If a blackout occurs, how do I
know? And what happens exactly in this scenario to loads, generators,
buses, and branches?
This is all in the context of simulating a cascading failure situation
like the 2003 northeast blackout.
Scott
On 05/08/2014 01:39 PM, Santiago Torres wrote:
In practice, when there is no balance between load and generation,
the frecuency of the system drops, and if you dont disconnect load, a
blackout occurs.
In that case, the simple power flow does not converge.
The optimal power flow will converge only if there is enough power
from some generator to satisfy the demand. In that case, the power
generation is rescheduled by the optimal power flow algorithm.
However, load and power generation balance is a requeriment in order
to get the power flow (or optimal power flow) converged.
You can refer to a power system textbook.
Hope this help.
Santiago
2014-05-08 15:21 GMT-05:00 Scott Proper <[email protected]
<mailto:[email protected]>>:
Recently I have been experimenting with using Matpower and
rundcpf() to simulate cascading branch failures and islanding.
One question that has occurred to to me is what happens when
there is not enough generator capacity to satisfy the loads at
all the buses? I have had little success figuring this out on my
own. To this end, I have two questions:
1) Is it possible to modify a case (i.e. case14.m) to create a
shortage of generator power? My attempts to do this have failed.
Turning down Pmax doesn't seem to limit generator power.
2) How does Matpower handle this case? Is it possible to measure
the satisfied load when there aren't enough generators?
Thank you,
Scott
--
Dr.-Ing. Santiago Torres
IEEE Senior Member
Power Systems Researcher
