Title: EE544 Distribution 1
1EE544 Distribution 1
- Distribution Feeder Analysis
2Feeder Analysis
- Explore modeling and performance of a feeder
Section with various Assumptions - How to look at performance
- Voltage drop
- Unbalance
- Distribution Power Flow
- Analysis of a complete feeder
3Feeder Analysis
- Examples will use following Data
Series impedance
Sequence Matrix assuming transposition ( Not
used in this lecture)
Shunt Capacitive Admittance ( Not used in this
lecture)
4Feeder Analysis
- Examples will use following Data
Series impedance
Series impedance
5Feeder Analysis
287 KVA 0.0.87 pf lag
5
C3 b
1 mi
Sub
C1 5000 C1 5000
2
3
1
C3 a
618 KVA 0.874 pf lag
13800 kV
732 KVA 0.82 pf lag
1 mi
Source impedance j0.005 pu
4
221 KVA 0.9 pf lag
6Feeder Analysis System Admittance Matrix
YOH12 YS
-YOH12
YOH12 YOH23 Yugb25 Yuga24
-YOH12
-Yuga24
-YOH12
-Yugb25
YOH23
-YOH12
Yuga24
-Yuga24
Yugb25
-Yugb25
7Feeder Analysis System Admittance Matrix
8Feeder Analysis System Admittance Matrix
1/
1/
1/
1/
-1
Zs
9Feeder Analysis
VSa/Zs VSb/Zs VSc/Zs -(S2a/V2a).
-(S2b/V2b) I -(S2c/V2c) -(S3a/V3c).
-(S3b/V3a) -(S3c/V3b).
-(S4a/V4a) -(S4a/V4b).
-(S4c/V4c) -(S5a/V5a).
-(S5b/V5b) -(S5c/V5c)
V Z I
10Feeder Analysis
VSa/Zs VSb/Zs VSc/Zs -(S2a/V2a).
-(S2b/V2b) I -(S2c/V2c) -(S3a/V3a).
-(S3b/V3b) -(S3c/V3c).
-(S4a/V4a) 0 0 0.
-(S5b/V5b) 0
V Z I
deg
V
11Feeder Analysis
Current and power in branch 2-3
12Feeder Analysis
At source
13Feeder Analysis - Ladder
14Feeder Analysis - Ladder
15Feeder Analysis - Ladder
Close enough
16Feeder Analysis - Ladder