Prices are marginal quantities, so the don’t tell you anything about the
“amount” of “shortage”, but rather the sensitivity of the overall system
objective to load/generation at the given bus. When you have prices that are
far above or below the range of generator costs, it means that a small change
in injection at that bus can cause a significant shift in generation between
expensive and inexpensive generators.
Ray
> On Feb 20, 2015, at 6:13 PM, mohd <[email protected]> wrote:
>
> Dear all,
>
> I have run my own test case as a DCOPF. I got results that show negative
> price in several buses and some other buses have large positive numbers in
> the order of $10,000 or so. I have checked the supply curve for generators
> and the most expensive generator has an incremental cost of around $104
> (flat). I understand that a negative price indicates excess generation in
> that specific area and what i want to understand if the numbers indicate
> anything. For example, i have one bus having -$81 and the other is -$15. Does
> that mean the first one has more excess generation compared to the later.
> Also, if i have a really huge number like in one bus, i have $3000 while the
> other $10,000. Does that mean the $10,000 bus has more shortage of generation
> compared to the other one. I appreciate any comments or suggestions about the
> interpretation of the results as well as how to improve my model further.
> Thanks and have a great weekend.
>
> Kindly,
> Mans
