研究目的：我国铁路既有线的很多地方都存在电能质量不高的问题。成因之一就是电网容量较小，负荷中铁路比重过大。因此，改善电气化铁路的电能质量当前函等解决的问题。
研究方法：针对我国宜万线的情况，通过分析我国牵引变电所在无功补偿和谐波治理方面采取的各种方案，得出了适合宜万线的牵引变电所无功补偿方案。
研究结果：宜万线牵引变电所采用可控补偿电抗器方案虽然能自动跟踪系统进行无功补偿，且设备简单、可靠，但存在产生谐波电流、噪音较大、损耗大的缺点。采用晶闸管投切电容器(TSC)方案，变电所需投资180万元。若采用固定滤波器(FC)+晶闸管调节电抗器(TCR)方案，牵引变电所需投资195万元。
研究结论：TSC方案只能提供分级的容性无功率，其分组越多，滤波效果越差。而TCR+FC型的SVC方案是一种比较切实可行的宜万线牵引变电所无功补偿方案。
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
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