Hello everybody
I want to know the operating cost, when a middle country (between two
countries) or transit country permit a transaction between two bordering
countries; i.e, I want to find the wheeling cost. Therefore, I need to run a
opf whit reserves, because the operating cost are: losses cost, congestion
cost and reserves cost.
I want to use the Matpower program for modeling the wheeling cost, therefore
I have two question:
1) I have to run opf with reserves without transaction and other opf with
reserves with transaction and then compared the two cost incurred in the
system. Therefore, I need to set the generation in a border node and set the
load in another node. For fix the load in a node, I could use:
define_constants;
mpc1=loadcase('case9');
mpc1.bus(4,PD)=175;
results1=runopf(mpc1)
But, for fix the generation in a node,I don't know it. How could I set a
generation constant regardless of the cost of generation?. I have thought
that a solution is set a generator with zero cost and fix the limits
Pmax=Pmin= P_fixed, and then use:
define_constants;
mpc1=loadcase('case9');
mpc1.bus(4,PD)=50;
mpc1.gen(4,9)=50;
results1=runopf(mpc1)
But, I don't know is the best solution or exist other solution?
2) When I run the opf with reserves, the program delivery the node prices
of energy and the reserves prices. For example, the case t_case30_userfcns
has the following responses:
| Reserves
|
============================================================================
====
Gen Bus Status Reserves Price
# # (MW) ($/MW) Included in Zones ...
---- ----- ------ -------- -------- ------------------------
1 1 1 25.00 2.00 1
2 2 1 15.00 2.00 1
3 22 1 0.00 2.00 1
4 27 1 0.00 2.00 1
5 23 1 19.39 3.50 1, 2
6 13 1 0.61 3.50 1, 2
--------
Total: 60.00 Total Cost: $177.81
Zone Reserves Price
# (MW) ($/MW)
---- -------- --------
1 60.00 2.00
2 20.00 3.50
In this case, I don't understand the Total Cost: $177.81. Because, I have
read that the reserves cost is: reserves price($/MW)*Reserves(MW)= $ 150.
This values are different. Why?
Gen Reserves * Price Reserves Cost
# (MW) ($/MW) ($)
---- ----- ------ ------------
1 25.00 2.00 50.00
2 15.00 2.00 30.00
3 0.00 2.00 00.00
4 0.00 2.00 00.00
5 19.39 3.50 67.86
6 0.61 3.50 2.14
--------
Total: 150.00
Besides: why the reserve price in the zone 2 is 3.5 ($/MW), if the
generators 5 and 6 offer reserves by 5 and 5.5 ($/MW), respectively?
My objective is simulate the system and find the wheeling cost for different
transit power energy for the middle country, then schedule the interchange
between the countries in a regional market.
Thank you very much
Best Regards
Santiago Chamba
