Abstract：Research purpose: The quality of electric power is not high in many places on existing railway lines in China. One of reasons for it is that the capacity of electric network is low and railway consumes power overlarge. Therefore, improving the quality of electric power for electrified railway is presses for solution at the moment.
Research method: Through the analysis of all kinds of schemes made for reactive-load compensation and harmonic treatment to traction substation in China, the suitable reactive-load compensation scheme is present to the traction substations of Yichang-wanzhou Railway Line according to the real situation of the line.
Research result: If the scheme of controllable compensation reactor is adopted on Yichang-Wanzhou Railway Line, although it can automatically trace the system and make compensation with simple devices and high reliability, but it makes harmonic current, large noise and great loss. If the scheme of crystal shutter tube turnover capacitor (TSC) is adopted, it needs investment of 1.8 million Yuan to substation. If the scheme of fixed filter (FC) plus crystal shutter tube adjustable reactor (TCR), it needs investment of 1.95 million Yuan to substation.
Research conclusion: TSC Scheme only can give step capacity reactive power and more groups, lower filtering effect. SVC Scheme of TCR plus FC is a suitable scheme of reactive-load compensation for traction substation of Yichang-Wanzhou Railway Line
2006, Vol. 23 
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