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
