ECE 421/599
Electric Energy Systems
Final Project – Planning Study
1
IEEE 39-bus (New
England) System
38
29
28
37
26
25
30
2
1
27
3
Equivalent of
39 NY System
4
9
17
8
18
7
31
21
22
19
13
6
24
15
14
5
16
11
10
32
12
33
35
20
34
Connecticut
Load Center
(CLC)
23
36
Tasks
• System condition: CLC load = 2GW
• Bus 39 is the slack bus (equivalent of NY)
• 5 dispatchable generators: 31, 32, 36, 37 and 38
• Tasks for ECE421
1. Solve Economic Dispatch for 5 dispatchable
generators and the others unchanged.
The ED neglects losses but considers limits of
dispatchable generators
2. Solve power flow (by N-R or F-D) using the ED
result
• Additional task for ECE599
3. Re-do Tasks 1-2 for two new conditions with
CLC load=2.4GW and 2.8GW with the rest of
loads unchanged. Let generator 39 change
slightly to cover the increased loss.
4. Draw P-V curves on PCLC - |V8| and PCLC - |V4|
in one plot and analyze the curves
(ECE421 student will receive up to 20% more
points if giving correct answers for Tasks 3&4)
|V|
P
3
System Data
• Base-case power flow data in Excel and PSS/E
version 30
– System Load: 9.3GW (CLC load: 2.0GW)
– Common bases: 100MVA, 1kV
• Fuel cost data on dispatched generators at 5 buses
Ci =ai 0 + ai1 Pi + ai 2 Pi 2
($/h)
Pi (min) ≤ Pi ≤ Pi (max)
Incremental cost
ai0
ai1
ai2
Pi(min)
Pi(max)
P31
200
4.92
0.00240
500
1000
P32
200
4.65
0.00250
500
1000
P36
300
4.21
0.00263
500
1500
P37
400
2.00
0.00333
500
1500
P38
500
2.22
0.00278
500
1200
4
Software Tools
•Option 1: Matlab code with the text book
•Option 2: Powertech PSAT
– Installed at server rd0.eecs.utk.edu
– Send ithelp@eecs.utk.edu a request for remote access if you
cannot connect it.
5
Project Report
• Organization
1. Project Requirements (brief statement on the system, data and tasks)
2. Project Results
• Tasks 1-2
– ED result (listing λi and Pi of 5 generators and total cost Ct)
– Power flow solution (listing Vi, δi, Pi, and Qi, or reporting
divergence)
• Tasks 3-4 (ECE599)
– ED results and power-flow solutions on two new conditions
– P-V curves and analysis
3. Conclusions
• Email the project report by Dec 15 (Monday)
6
PSAT of Powertech’s DSA Tools
7
Import power-flow data from a PSS/E 30 RAW file
8
PSS/E 30 RAW Data Format:
Bus Data and Shunt Data
Fixed Shunt
Shunts in Mvar at 1pu voltage
AC Bus
1 – PQ bus, 2- PV bus,
3- Slack bus
|Vi| in pu
δi in deg.
9
PSS/E 30 RAW Data Format: Load Data
Load
Pi
Qi
10
PSS/E 30 RAW Data Format: Generator Data
Pi
Qi
Qimax Qimin
Pimax Pimin
Generator
11
PSS/E 30 RAW Data Format:
Line Data
Rij
Xij
Bch
Line
12
PSS/E 30 RAW Data Format: Transformer Data
Bus1 Bus2 Ratio XT
Adjustable Transformer
13
Solve Power Flows
•
Change the method and settings
14
15
Edit generation or load at a specific bus
16
Define a sub-system
Save as “Load Center”
for the sub-system on
the CLC region
Save as “Generation” for
the sub-system on 5
dispatched generators
17
Uniform load adjustment on a sub-system
2
1
3
18