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Distribution Feeder Voltage Regulation and Control

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... Utilization Voltage = 115 volts. Maximum Utilization ... Minimum Utilization Voltage = 107 volts. ANSI Range A Critical Voltages. Voltage Drop Assumptions ... – PowerPoint PPT presentation

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Title: Distribution Feeder Voltage Regulation and Control


1
Distribution Feeder Voltage Regulation and Control
  • W. H. Kersting
  • Milsoft Utility Solutions

2
Purpose of This Paper
  • Present ANSI Voltage Standards
  • Present Step Voltage Regulator
  • What it is
  • Control Settings
  • Model
  • IEEE 13 Node Test Feeder
  • Steps in regulating voltage on the test feeder

3
The ANSI Voltage Standards
  • Range A
  • Nominal Utilization Voltage 115 volts
  • Maximum Utilization Voltage 126 volts
  • Minimum Service Voltage 114 volts
  • Minimum Utilization Voltage 110 volts
  • Range B
  • Nominal Utilization Voltage 115 volts
  • Maximum Utilization Voltage 127 volts
  • Minimum Service Voltage 110 volts
  • Minimum Utilization Voltage 107 volts

4
ANSI Range A Critical Voltages
5
Voltage Drop Assumptions
  • 1 Volt drop on the service drop
  • 2 Volt drop on the secondary
  • 3 Volt drop through the transformer
  • Minimum Voltage at the Transformer Primary
    Terminals will be 120 volts

6
Voltage Profiles
7
Step Voltage Regulator
8
Type B Step Voltage Regulator
9
The Step-Voltage Regulator Model
10
Three Phase Voltage Regulator Model
11
Model Matrix
12
Compensator Circuit
13
Control Panel
14
Control Circuit
15
Regulator Control Settings
  • Voltage Level voltage to hold at the regulation
    point
  • R and X setting (volts) Equivalent impedance
    from the regulator to the regulation point
  • Time Delay time after a tap change required
    before the tap is changed
  • Bandwidth allowed deviation from the set
    voltage level

16
Compensator Impedance
17
Equivalent Line Impedance
18
Bandwidth
19
IEEE 13 Node Test Feeder(Modified)
20
Modifications
  • Line 4-12 changed to phases B-C
  • Transformer 6-7 changed to Ungrounded Wye Delta
  • Load at Node 7 converted to Delta-PQ
  • Load at Node 8 converted to Delta-PQ
  • Load at Node 14 changed to phase B with constant
    Z load
  • Load added at Node 5 300 j145.3 kVA

21
Step 1
  • Select regulation point to be Node 4
  • Run power-flow with source set to 126 volts
  • Display Voltage Profile
  • Compute compensator impedance

22
Step 1 Voltage Profile
23
Voltages and Currents from Power-Flow Run
24
Compensator R and X Settting
25
Full Load with Regs, no Caps
26
Observations
  • Regulator taps
  • Phase a 11
  • Phase b 12
  • Phase c 15
  • Concern about high voltage at Node 2
  • Need to add shunt capacitors

27
Shunt Capacitors
  • Source reactive power
  • Phase A 765 kvar
  • Phase B 809 kvar
  • Phase C 1105 kvar
  • Install shunt capacitors
  • Node 3 100 kvar per phases a,b,c
  • Node 4 600 kvar per phases a,b,c
  • Node 13 150 kvar on phase c

28
Full Load with Regs and Caps
29
Observations
  • Regulator taps
  • Phase a 5
  • Phase b 6
  • Phase c 7
  • Notice good voltage balance
  • All voltages between 120 and 122 volts at Node 4

30
50 Load with all Capacitors
31
50 Load with 900 kvar at Node 4 switched off
32
10 Load Growth with original caps
33
10 Load Growth100 kvar per phase added at node 4
34
Questions?
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