Title :
DC line protection for VSC-HVDC system
Author :
Ahmed, Waseem ; Manohar, P.
Author_Institution :
S.J. (Gov.) Polytech., Bangalore, India
Abstract :
Voltage source converters based HVDC (VSC-HVDC) systems involving overhead transmission lines are prone to severe over-currents and over-voltages during dc line faults. This necessitates the operation of the system with some kind of protective devices to overcome the effects of dc line faults. Due to uneconomical and non availability of commercial DC circuit breakers the present day VSC-HVDC systems find applications only in back to back and/ or underground cable transmission, power ranging in the order of 400 MW. In the present work, the application of superconducting fault current limiter (SCFCL) along with chopper controlled resistors (CCR) is proposed to overcome the effect of over-voltages and over currents. The VSC-HVDC system is analysed with the high voltage and high current (110 kV, 2.8 kA) resistive SCFCL and the CCR in PSCAD/EMTDC environment. The results of analysis for various ac and dc fault conditions are quite encouraging.
Keywords :
HVDC power convertors; HVDC power transmission; circuit breakers; fault current limiters; overcurrent protection; overvoltage protection; power overhead lines; power transmission faults; power transmission protection; CCR; DC line protection; PSCAD-EMTDC environment; SCFCL; VSC-HVDC system; ac fault conditions; chopper controlled resistors; commercial DC circuit breakers; current 2.8 kA; dc fault conditions; dc line fault effects; overcurrent effect; overhead transmission lines; overvoltage effect; power 400 MW; protective devices; superconducting fault current limiter; underground cable transmission; voltage 110 kV; voltage source converter based HVDC systems; Circuit faults; HVDC transmission; High-temperature superconductors; Power conversion; Resistors; Voltage control; PSCAD/EMTDC; VSC-HVDC; chopper controlled resistors; dc line fault; dynamic analysis; fault recovery; over currents; over voltages; protection; superconducting fault current limiter;
Conference_Titel :
Power Electronics, Drives and Energy Systems (PEDES), 2012 IEEE International Conference on
Conference_Location :
Bengaluru
Print_ISBN :
978-1-4673-4506-4
DOI :
10.1109/PEDES.2012.6484499
