Title :
Performance of a self-commutated BTB system under a single-line-to-ground fault condition
Author :
Hagiwara, Makoto ; Akagi, Hirofumi ; Fujita, Hideaki
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Japan
Abstract :
This paper deals with a self-commutated BTB (back-to-back) system for the purpose of power flow control and/or frequency change in transmission systems. Each BTB unit consists of two sets of 16 three-phase voltage-source converters, and their AC terminals are connected in series with each other via 16 three-phase transformers. Hence, the BTB unit uses totally 192 switching devices capable of achieving gate commutation. This results in a great reduction of voltage and current harmonics without performing PWM control. Simulation results verify the validity of the proposed system configuration and control scheme not only under a normal operating condition but also under a single-line-to-ground fault condition
Keywords :
HVDC power convertors; HVDC power transmission; commutation; harmonics suppression; load flow control; power system faults; power system harmonics; power system interconnection; thyristor convertors; 6 kA; 6 kV; 800 MW; AC terminals; GCT thyristors; HVDC transmission/interconnection systems; current harmonics reduction; frequency change; gate commutation; gate-commutated turn-off thyristors; multi converter; power flow control; self-commutated back-to-back system; single-line-to-ground fault condition; switching devices; three-phase voltage source converters; transmission systems; unit capacitance constant; voltage harmonics reduction; Circuits; HVDC transmission; Power engineering and energy; Power system stability; Pulse width modulation; Pulse width modulation converters; Switching converters; Switching frequency; Thyristors; Voltage control;
Conference_Titel :
Power Conversion Conference, 2002. PCC-Osaka 2002. Proceedings of the
Conference_Location :
Osaka
Print_ISBN :
0-7803-7156-9
DOI :
10.1109/PCC.2002.998130
