摘要
川藏线属于典型复杂电气化铁路,薄弱外部电网和大量长大坡道使得牵引供电系统面临正反向潮流冲击、电能质量恶化、再生制动能量回收难等严峻挑战。为充分利用川藏线太阳能资源、减轻外部电网压力、改善牵引侧电能质量及回收再生制动能量,提出一种适应复杂电气化铁路的牵引用光伏发电系统及其综合优化控制方法。首先,结合川藏线路特性,理论分析系统整体能量控制模式及电能质量优化补偿原理;然后,针对系统综合优化控制方法,分别在系统层设计考虑相间制动能量转移的综合能量管理策略,在器件层建立含电能质量指标约束的背靠背变流器补偿模型,并给出基于粒子群算法的补偿功率计算方法;最后,基于典型工况及实测算例,从综合能源利用及转移情况、电能质量改善效果、背靠背变流器容量利用率等方面进行对比分析与验证。结果表明:所提方法能够达到有效消纳光伏电能、实现相间制动能量合理优化利用、改善牵引侧无功负序等多重功能;在提高变流器容量利用率的同时,实现牵引用光伏设备多功能集约一体化的目的。
Sichuan-Tibet Railway is a typical complex electrified railway with weak external power grid and a large number of long ramps, which makes traction power supply system(TPSS) face severe challenges, such as the impact of stochastic power flow, the deterioration of power quality and the difficulty of regenerative braking energy(RBE) recovery. In order to use the solar energy of Sichuan-Tibet Railway, relieve the pressure of external power grid, improve power quality and recover RBE, a comprehensive optimization control method for traction photovoltaic(PV) power generation system was proposed. Firstly, the system energy control mode and compensation principle were analyzed theoretically. Then, the energy management strategy considering braking energy transfer was designed in the system layer. Meanwhile, the compensation model of back-to-back converter with power quality index constraints was established and corresponding compensation power calculation method based on particle swarm optimization algorithm was given in the device layer. Finally, based on typical conditions and field cases, the comparative analysis and verification were carried out from these aspects: comprehensive energy utilization, power quality improvement, and capacity utilization of converters. The results show that the proposed method can effectively absorb PV energy, utilize interphase braking energy, and improve negative sequence/reactive power on traction side. Furthermore, the capacity utilization ratio of the converters was improved and the purpose of multi-function integration of traction PV equipment was also implemented.
作者
邓文丽
戴朝华
张涵博
张丽
李密
吴志宇
DENG Wenli;DAI Chaohua;ZHANG Hanbo;ZHANG Li;LI Mi;WU Zhiyu(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第18期5849-5864,共16页
Proceedings of the CSEE
基金
国家自然科学基金项目(51307144)
四川省科技计划项目(20YYJC4428)。
关键词
牵引供电系统
光伏发电系统
优化运行控制
能量管理
川藏铁路
traction power supply system(TPSS)
photovoltaic(PV)generation system
optimization operation control
energy management
Sichuan-Tibet railway
