Title :
A new control method preventing transformer DC magnetization for voltage source self-commutated converters
Author :
Nakajima, Tatsuhito ; Suzuki, Kenichi ; Yajima, Masashi ; Kawakami, Noriko ; Tanomura, Dyi-Rong ; Irokawa, Shoichi
Author_Institution :
Tokyo Electr. Power Co. Inc., Yokohama, Japan
fDate :
7/1/1996 12:00:00 AM
Abstract :
A DC component contained in an output of a voltage source self-commutated converter causes a converter transformer to be DC-magnetized, in the worst case causing an overcurrent due to saturation. We experienced the DC-magnetization of the converter transformer of a 50 MVA self-commutated SVC installed in the Shinshinano Substation of Tokyo Electric Power Company when system disturbances occurred by energizing of an adjacent large capacity transformer. After analysing the problem, a novel DC magnetization prevention control was developed that makes a fast flux correction according to the voltage DC component detected in the converter output. This method was applied to the 50 MVA self-commutated SVC and produced satisfactory operation results
Keywords :
commutation; magnetic flux; magnetic variables control; magnetisation; power convertors; power transformers; static VAr compensators; substations; 50 MVA; Shinshinano Substation; Tokyo Electric Power Company; control method; converter transformer; fast flux correction; overcurrent; saturation; self-commutated SVC; transformer DC magnetization prevention; voltage source self-commutated converters; Circuit faults; Magnetic analysis; Magnetic flux; Power system faults; Power system harmonics; Saturation magnetization; Static VAr compensators; Substations; Thyristors; Voltage control;
Journal_Title :
Power Delivery, IEEE Transactions on
