M. Ishikawa, T. Hano, and Souichirou (Japan)
Ultra long distance HVDC transmission lines, DC-AC inverter, STATCOM, AC and DC line faults
The objective of the present paper is to study engineering feasibility of ultra long distance HVDC transmission lines (2500 km and 4000 km) to Japan. It has been shown that the loss of the lines ranges from 4 % for 800 kV and 2500 km to 17 % for 500 kV and 4000 km, depending on the voltage used and the line length needed. Usefulness of STATCOM has, then, been studied, where the power flow calculation and the transient stability analysis have been carried out to simulate the transient response of AC voltage after the three-phase ground fault or the DC line fault. It has been shown that STATCOM has an ability to keep the AC voltage high and to send full designed 5.0 GW of DC power. A comparison between the systems with and without STATCOM has shown that the recovered AC voltage after the three-phase ground fault becomes higher, as the node connected with STATCOM is nearer to the inverter. It is also found that the difference between the systems with and without STATCOM becomes small for the DC line fault compared with the AC fault.
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