基于大容量SVC的SCOTT变压器电能质量治理方案及应用  

SCOTT Transformer Power Quality Compensation Scheme and Its Application Based on High-Capacity SVC

作　　者：王卫安[1,2] 桂卫华[1] 张定华[1,2] 薛蛟 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083 [2]中国南车集团株洲变流技术国家工程研究中心,湖南株洲412001 [3]中国神华集团神朔铁路分公司,陕西神木719300

出　　处：《铁道学报》2011年第1期31-38,共8页Journal of the China Railway Society

基　　金：国家科技支撑计划(2007BAA12B03);国家高技术研究发展计划(863计划)(2006AA05Z248)

摘　　要：针对斯科特变压器由于运量增大、主变压器的两相工况差异大而造成的电压波动大、功率因数低、谐波和负序电流大的问题,提出在变压器55 kV侧接1个大容量晶闸管控制电抗器支路和3个固定电容补偿支路,其中晶闸管控制电抗器支路和2个固定电容补偿支路安装于重载臂,而另一个固定电容补偿支路安装于轻载臂。结合其拓扑结构,提出以负序电流最小为目标的多约束无功功率优化控制数学模型,并对其控制过程进行详细分析。实际应用表明:该装置解决了重载臂的电能质量问题,使电压跌落从30%减少到11%,功率因数由0.76提高到0.98;并显著减少高压侧的负序电流,提高了变压器的效率和利用率。The power quality of the SCOTT traction substation is deteriorated with increscent loads and distinction of two phase condition,including the poor power factor,big voltage fluctuation,high harmonics and negative sequence current.The adopted solution comprises one large power 55 kV thyristor controlled reactor（TCR） and three fixed capacitors（FC）.The TCR and two FCs were installed in the burden phase while the other FC was installed in the light phase.On the basis of the topology of the compensation system,the mathematical model of real time reactive power optimization control in the traction substation was invented,and the control of TCR was discussed in detail.Power quality indexes before and after the system was put into operation were compared,the voltage depreciation of the burden phase is decreased from 30% to 11%,and the power factor is increased from 0.76 to 0.98.At the same time,the negative sequence current is improved,and the efficiency and utilizable capability of the transformer is promoted.

关 键 词：斯科特变压器 电能质量 静止无功补偿器 电压稳定 晶闸管控制电抗器 

分 类 号：U223.5[交通运输工程—道路与铁道工程]