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Fault Analysis in HVDC Systems Using Signal Processing Techniques. Benish Paily School of Electrical and Electronic Engineering You Supervisors’ Names Here Dr. Malabika Basu Dr. Michael Conlon 29 th November, 2013. Presentation Overview. HVDC-Next Dimension. Current Link HVDC System - PowerPoint PPT Presentation
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Fault Analysis in HVDC Systems Using Signal Processing Techniques
Benish PailySchool of Electrical and Electronic Engineering
You Supervisors’ Names Here
Dr. Malabika BasuDr. Michael Conlon
29th November, 2013
Presentation Overview
2
1 • HVDC - Next Dimension
2• HVDC Projects
3• Fault Analysis of HVDC System
HVDC-Next Dimension
3
• LCC HVDC
1954
• VSC HVDC1980 • MULTITERMINA
L HVDC
FUTURE
Total 200,000MW HVDC Transmission Capacity in operation or under construction170 Projects around the world
ABB: 90 Projects, 120,000MWHVDC Light Technology
Siemens: HVDC Plus Technology
1. Current Link HVDC System2. Voltage Link HVDC System
HVDC Projects
4
HVDC Projects in Europe (ABB)
East West Interconnector (HVDC Light)2013, connecting Ireland and Wales
1. Link between Ireland and Wales2. Power rating: 500MW3. AC Voltage: 400 kV4. DC Voltage:± 200kV5. DC Underground cable: 2*75 km6. DC Submarine cable: 2*186 km
Fault Analysis of HVDC Systems
5
HVDC system subjected to DC Line Fault
1. Line to ground fault
2. Line to line fault
HVDC system subjected toAC line fault at Rectifier & Inverter side
1. Single line to ground fault (SLG)
2. Line to line fault (LL)
3. Double line to ground fault (DLG)
4. Triple line to fault (3L)
Faults in HVDC System
6
DC FaultsDC Current increases to 2.2 p.u.
DC Voltage falls to zero at the rectifier
AC FaultsDC Current
DC Voltage
Fault Identification in HVDC System
abc to dq0 transformation1. Computes the direct axis, quadratic axis and
zero sequence quantities in a two-axis rotating reference frame for a three-phase sinusoidal signal
2. Known as Park transformation
7
abc to dq0 transform in DC and AC fault of HVDC
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Parameter Distance (km) DQ magnitude
Normal Operation 0 12.38
DC Fault50 26.58
100 27.48
150 28.09
200 28.18
250 28.40
PEAK MAGNITUDE OF DQ UNDER DC FAULTS
abc to dq0 transform (conti.)
10
AC Faults at Rectifier side Peak Magnitude of dq in unit
No Fault 12.38
Single line to ground fault 99.23
Line to line fault 150.60
Double line to ground fault 144.96
Triple line to ground fault 223.18
PEAK MAGNITUDE OF DQ VALUES UNDER AC FAULTS AT RECTIFIER SIDE
Wavelet Transform
11
1. Mathematical Technique2. Analysing signals simultaneously in time and frequency
Wavelet transform in DC and AC fault of HVDC
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Absolute maximum value of five levels wavelet coefficients of dc line current for dc fault at various fault distances
DC Fault NormalOperation
50 km 100km
150km
200km
250Km
Max. value of waveletcoefficients in five level
0.09 0.18 0.28 0.67 0.78 0.83
DC faults at 150 km, 250 km
Wavelet transform (cont.)
13
Absolute maximum value of five levels wavelet coefficients of dc current for various ac fault at rectifier side
AC Fault atRectifier side
Normal Operation
SLG LL DLG LLL
Maximum coefficients
0.090.35 0.43 0.25 0.41
SLG and LL Fault
Conclusions• 1. Fault Identification in HVDC system is a challenging process
because it should be accurate and fast• 2. abc to dq0 and wavelet transform can be applied to fault
identification• 3. In fault identification abc to dq0 transform performed very well
but the accuracy of fault distance estimation was poor.• 4. Wavelet transform is considered as a powerful signal processing
tool for transient analysis of signal• 5. Wavelet transformation effectively proved that it can detect the
abrupt changes of the signal indicative of a fault.
13
Thank you