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Half-wavelength AC transmission (HWACT) is an ultra-long distance AC transmission technology, whose electrical distance is close to half-wavelength at the system power frequency. Due to the excellent transmission capacity, stability control device must be installed in HWACT system. But the characteristics of the voltage and current of half -wavelength transmission line under fault condition are different from the characteristics of the ordinary short line. Its distributed-parameter characteristics are notable. So it is necessary to study the adaptability of the fault trip criterion for traditional lines to the HWACT lines. Simulation of the transmission line under fault condition was conducted in this paper based on the Bergeron model and adaptive analysis of fault trip criterion in stability control device for half-wavelength line was given. The results show that the fault trip criterion for traditional lines can’t be well applied to half-wavelength line. New fault trip criterion needs to be proposed to keep the safe operation of half-wavelength transmission line.

Adaptive Simulation of Fault Trip Criterion in Stability Control Device for Half-Wavelength Line