EE544 Distribution 1

1
EE544 Distribution 1

• Distribution Feeder Analysis

2
Feeder 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

3
Feeder 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)
4
Feeder Analysis

• Examples will use following Data

Series impedance
Series impedance
5
Feeder 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
6
Feeder Analysis System Admittance Matrix
YOH12 YS
-YOH12
YOH12 YOH23 Yugb25 Yuga24
-YOH12
-Yuga24
-YOH12
-Yugb25
YOH23
-YOH12
Yuga24
-Yuga24
Yugb25
-Yugb25
7
Feeder Analysis System Admittance Matrix
8
Feeder Analysis System Admittance Matrix
1/
1/
1/
1/
-1
Zs
9
Feeder 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
10
Feeder 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
11
Feeder Analysis
Current and power in branch 2-3
12
Feeder Analysis
At source
13
Feeder Analysis - Ladder
14
Feeder Analysis - Ladder
15
Feeder Analysis - Ladder
Close enough
16
Feeder Analysis - Ladder