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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 29th November, 2013
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Presentation Overview
1 HVDC - Next Dimension 2 HVDC Projects 3 Fault Analysis of HVDC System
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HVDC-Next Dimension 1954 1980 FUTURE Current Link HVDC System
LCC HVDC 1954 VSC HVDC 1980 MULTITERMINAL HVDC FUTURE Current Link HVDC System Voltage Link HVDC System Total 200,000MW HVDC Transmission Capacity in operation or under construction 170 Projects around the world ABB: 90 Projects, 120,000MW HVDC Light Technology Siemens: HVDC Plus Technology
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HVDC Projects HVDC Projects in Europe (ABB)
East West Interconnector (HVDC Light)2013, connecting Ireland and Wales Link between Ireland and Wales Power rating: 500MW AC Voltage: 400 kV DC Voltage:± 200kV DC Underground cable: 2*75 km DC Submarine cable: 2*186 km
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Fault Analysis of HVDC Systems
HVDC system subjected to DC Line Fault HVDC system subjected to AC line fault at Rectifier & Inverter side Single line to ground fault (SLG) Line to line fault (LL) Double line to ground fault (DLG) Triple line to fault (3L) Line to ground fault Line to line fault
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Faults in HVDC System AC Faults DC Faults
DC Current increases to 2.2 p.u. AC Faults DC Current DC Voltage DC Voltage falls to zero at the rectifier
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Fault Identification in HVDC System
abc to dq0 transformation Computes the direct axis, quadratic axis and zero sequence quantities in a two-axis rotating reference frame for a three-phase sinusoidal signal Known as Park transformation
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abc to dq0 transform in DC and AC fault of HVDC
Peak Magnitude of DQ under DC faults Parameter Distance (km) DQ magnitude Normal Operation 12.38 DC Fault 50 26.58 100 27.48 150 28.09 200 28.18 250 28.40
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abc to dq0 transform (conti.)
Peak Magnitude of DQ values under AC faults at Rectifier side 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
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Wavelet Transform Mathematical Technique
2. Analysing signals simultaneously in time and frequency
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Wavelet transform in DC and AC fault of HVDC
DC faults at 150 km, 250 km Absolute maximum value of five levels wavelet coefficients of dc line current for dc fault at various fault distances DC Fault Normal Operation 50 km 100 km 150 200 250 Km Max. value of wavelet coefficients in five level 0.09 0.18 0.28 0.67 0.78 0.83
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Wavelet transform (cont.)
SLG and LL Fault Absolute maximum value of five levels wavelet coefficients of dc current for various ac fault at rectifier side AC Fault at Rectifier side Normal Operation SLG LL DLG LLL Maximum coefficients 0.09 0.35 0.43 0.25 0.41
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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.
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Thank you
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