Transcript Sag Generator Testing

Power quality management for
induction furnace foundry
Mr.Danaisak Tangsakha
Provincial Electricity Authority (PEA)
Thailand
Topic
• Introduction
• Problem & Mitigation Techniques
• Conclusion
Provincial Electricity Authority, Thailand
17 July 2015
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What is “Harmonics
Voltage”?
A sinusoidal voltage with a frequency equal
to an integer multiple of the fundamental
frequency of the supply voltage (EN50160)
Order 3 : 3 × 50 Hz = 150 Hz
Provincial Electricity Authority, Thailand
17 July 2015
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Where is the source of the harmonics?
Other loads
Other loads
Harmonic
current
flow
(a) Power flow at the fundamental frequency
Three-phase
voltage and current
measurements
Motors and all
other linear
loads
PF Correction
Capacitor Banks
Nonlinear Load
Provincial Electricity Authority, Thailand
(b) Harmonic power flow
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Single Line Diagram
PEA System
115 kV
GENERAL
LOAD
GENERAL
LOAD
Provincial Electricity Authority, Thailand
GENERAL
LOAD
GENERAL
LOAD
17 July 2015
INDUCTION
FURNANCE
LOAD
5
INDUCTION FURNANCE
• Induction Furnace inverter 24 pluse
• Ideal harmonic h=p±1 order 23, 25
• 4 unit and Full Load 3 unit (39.80 MW)
Provincial Electricity Authority, Thailand
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INDUCTION FURNANCE
PEA System
115 kV
INDUCTION
FURNANCE
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INDUCTION
FURNANCE
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Load Characteristic
Time plot
10000
10 pm – 9 am
kW
7500
5000
2500
0
TOT P (kW) (max)
16:00
12/07/2009
Sunday
18:00
20:00
22:00
00:00
13/07/2009
Monday
02:00
04:00
06:00
08:00
10:00
Event #12 at 04/07/2009 09:50:11.040
AVrms, BVrms, CVrms Ins tantaneous Sag
TOU rate : Customer Loads operated in off-peak period
Provincial Electricity Authority, Thailand
17 July 2015
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Problem
• Induction Furnace Load THD over limit
Harmonics Standard in Thailand
• Adjacent 22 kV Customers complaints
included flickering lights, UPS alarms,
drive trips, impairment of electronic
equipments
Provincial Electricity Authority, Thailand
17 July 2015
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Total Harmonic Distortion ,THD
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Harmonics Standard in Thailand
Table 1 Harmonics Current Limit (Base 1,000 MVA)
Tolerances 10% or 0.5 A , 2 order
PRC - PQG - 01 / 1998
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Harmonics Standard in Thailand
Table 5-2 limit of Total Harmonic Distortion VoltageTHDv (%)
Point of Common Total Harmonic
Coupling : PCC Distortion Voltage
(kV)
THDv (%)
Individual Harmonic
Distortion Voltage(%)
Odd
Even
0.4
5
4
2
11 and 12
4
3
1.75
22 ,24 and 33
3
2
1
69
2.45
1.63
0.82
115 and above
1.5
1
0.5
PRC - PQG - 01 / 1998
Provincial Electricity Authority, Thailand
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Voltage Fluctuation Standard in Thailand
Point of Common Coupling
: PCC (kV)
Below 115 kV
More than 115 kV
Pst
Plt
1.0
0.8
0.8
0.6
Pst ; Short-Term Severity Values (10 minutes)
Plt : Long-Term Severity Values (2 hours)
PRC - PQG - 02 / 1998
Provincial Electricity Authority, Thailand
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Mitigation Techniques
•
•
•
•
Connect to Network
Monitoring
Harmonic Filter
Simulation
July,2009
Provincial Electricity Authority, Thailand
Sep,2009
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Network Configuration
230/115 kV
230/115 kV
BPA
SPA
115/22 kV
115/22 kV
NPA
NPB
LNS
Provincial Electricity Authority, Thailand
END LINE
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Monitoring With out Harmonics Filter
• Harmonics current at PCC:115kV at Ling Nan
Steel for 1 EAF with out Harmonics Filter
Case
MVA
Base
1
2
Harmonics Order
3
4
5
6
7
8
9
With out Harmonics
- 70.28 5.85 6.33 7.91 6.55 6.6 2.48 0.91 1.22
Filter
With Harmonics Filter
Harmonics Current Limit
1,000 5
4
3
4
2
3
1
1
at Base 1,000 MVA
Ih limit Base on 115kV
1,984 - 9.92 7.99 5.99 7.99 3.99 5.99 2
2
Nakorn Pathom2
Remark
×
×
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Monitoring With out Harmonics Filter
• Harmonics current at PCC:115kV at Ling Nan
Steel for 1 EAF with out Harmonics Filter
Case
MVA
Harmonics Order
Ih rms
Base 10 11 12 13 14 15 16 17 18 19
- 1.04 3.95 0.92 2.98 0.49 0.65 0.73 1.18 0.57 0.97 16.19
-
With out Harmonics Filter
With Harmonics Filter
Harmonics Current Limit at
1,000 1
Base 1,000 MVA
Ih limit Base on 115kV
1,984 2
Nakorn Pathom2
Remark
Provincial Electricity Authority, Thailand
3
1
3
1
1
1
1
1
1
10.34
5.99
2
5.99
2
2
2
2
2
2
20.63
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Harmonic Filter
• Tuned Filter Order 4 and 5
• High pass filter Order 6
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Simulation by DIgSILENT
On Site Tuned Filter
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Harmonic Filter
4th
5th
6th
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Harmonic Filter
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Simulation by DIgSILENT
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Monitoring and Simulation
Case
1
2
-
9.92
7.99
5.99
198.89
1.14
7.70
177.1
0.79
3.69
Ih limit Base on 115kV
Nakhon Pathom2
With Harmonics Filter
Simulation : DigSILENT
Remark
Case
Harmonic Order
3
4
5
6
7
8
9
7.99
3.99
5.99
2
2
1.93
5.20
0.91
1.81
0.45 0.45
0.36
0.03
0.12
0.21
0.83 1.44
16
17
18
19
2
2
Harmonic Order
13
14
15
10
11
12
Ih limit Base on 115kV
Nakhon Pathom2
2
5.99
2
5.99
2
2
2
2
With Harmonics Filter
0.45
2.49
0.45
1.81
0.45
0.45
0.45
0.45
0.45 0.68
Simulation : DigSILENT
Remark
0.07
4.1
0.12
1.39
0.51
0.5
0.6
0.83
1.44 0.33
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Conclusion
• The network configuration in this case reduced
the affect to nearby customers and also improved
voltage level.
• The results of harmonic filters are
dramatically reduced voltage distortion on the 22
kV and not to affect the nearby customer
• Customer run 3 unit from 4 unit because harmonic
filters design for 3 unit.
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Thank you for your attention…
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