摘要
针对树形双边贯通牵引供电系统负序导致的电力系统侧公共连接点处三相电压不平衡问题,提出在树形双边贯通牵引供电系统中加装由降压变压器、潮流控制器(PFC)和控制器组成的补偿装置进行功率转移的负序补偿方案;在建立采用PFC的贯通型牵引供电系统拓扑结构和数学模型的基础上,设计合理的约束参数和控制策略,通过控制补偿装置改变电力系统侧功率分布,从而实现负序补偿;采用MATLAB/Simulink仿真试验平台,分析补偿装置所需容量随负序补偿程度的变化规律,并计算最小化负序补偿容量,对补偿方案进行验证。结果表明:基于功率转移的负序补偿方案能够灵活调节公共连接点处负序功率和无功功率含量;可将公共连接点处三相电压不平衡度的最大值降低至4%,95%统计值降低至2%,满足了国家标准,从而验证了基于功率转移负序补偿方案的有效性。
In order to solve the problem of three-phase voltage unbalance at the point of common coupling on the power system side caused by the negative sequence of tree bilateral interconnected power supply system,this paper proposes a negative sequence compensation scheme for power transfer by installing a compensation device composed of the step-down transformer,the power flow controller(PFC)and the controller in the tree bilateral interconnected power supply system.On the basis of establishing the topology and mathematical model of the interconnected traction power supply system using PFC,reasonable constraint parameters and control strategies are designed to control the compensation device to change the power distribution on the power system side to achieve negative sequence compensation.The MATLAB/Simulink simulation test platform is used to analyze the variation law of the required capacity of the compensation device with the degree of the negative sequence compensation,and the minimum negative sequence compensation capacity is calculated to verify the compensation scheme.The results show that the negative sequence compensation scheme based on power transfer can flexibly adjust the negative sequence power and reactive power content at the point of common coupling.The maximum value of three-phase voltage unbalance at the point of common coupling can be reduced to 4%,and 95%statistical value can be reduced to 2%,which meets the national standard and verifies the effectiveness of the negative sequence compensation scheme based on power transfer.
作者
郭旭刚
GUO Xugang(Locomotive and Car Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2024年第1期155-161,共7页
China Railway Science
基金
国家自然科学基金资助项目(52027810)
中国铁道科学研究院集团有限公司院基金课题(2023YJ030)。
关键词
牵引供电系统
贯通供电
负序补偿
无功补偿
潮流控制器
Traction power supply system
Interconnected power supply
Negative sequence compensation
Reactive power compensation
Power flow controller
