摘要
为了研究高速动车组作为大功率单相非线性负荷引起的电力系统三相电流不平衡问题,通过对V/v接线牵引变压器负序电流的分析,引入随机过程,建立了牵引变电所负荷和负序电流概率模型。利用统计推断解析和模拟负序电流的概率分布,并进行了仿真分析,得出了V/v接线方式高速铁路牵引供电系统的负序电流与功率因数的影响关系和电流不平衡度的主要分布情况。结果表明,该牵引变电所负荷和负序电流概率模型,具有较强的适应性和适用性,能够比较真实地模拟高速铁路的运行特性和负序电流分布情况。
To research the unbalanced three-phase current caused by high-speed train when it is operating as a singlephase nonlinear load with large power,the traction substation load and negative phase sequence current probability model is established based on the analysis of V/v connection transformer negative phase sequence current and stochastic process using statistical inference to analysis and simulate the negative sequence current probability distribution.The simulation result gives the relation between negative sequence current and the power factor and the distribution of the unbalanced current of the high-speed traction substation system under V/v connection. The results show that the probability model of traction substation load and negative sequence current is with strong adaptability and suitability. It can reflect accurately the operation characteristic and negative sequence current distribution of high speed railway.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2015年第6期56-61,共6页
Proceedings of the CSU-EPSA
基金
国家自然科学基金资助项目(51177139)
关键词
高速铁路
牵引供电系统
负序
随机过程
概率模型
high-speed railway
traction supply system
negative phase sequence
stochastic processes
probability mode
