摘要
电铁动车牵引负荷采用单相工频交流27.5 kV供电,接入电网后会严重影响电网电能质量,增加电能损耗。为此,提出一种根据机车运行变化利用投切电感改进参数匹配、达到改善电能质量的方法。首先基于Y/>/接线平衡变压器模型,运用二端口网络的T形等效电路类比平衡变压器副边电路拓扑结构,提出LC补偿和LL补偿2种方案;继而以满足平衡变压器模型输出边两相电压和电流分别正交的特性为约束,推导出补偿元件参数取值计算公式;最后在MATLAB/Simulink软件平台上搭建了10 kV/27.5 kV牵引供电系统模型,分析机车驶出供电段过程中实际功率从额定功率S变化到0时电网侧电压不平衡度。仿真结果证实了所提方法的有效性和实用性。
The electric railway adopts single-phase power frequency AC 27.5 kV for supplying the traction load,which may seriously affect the power quality of the power grid and increase power loss when it is connected to the power grid.This paper proposes to use the switching inductance to improve parameter matching and power quality according to running changes of the locomotive.Firstly,based on the Y/>/connected balance transformer model,it uses the T-type equivalent circuit of the two-port network to analogy the topology of the secondary circuit of the balance transformer and proposes two compensation strategies including LC compensation and LL compensation.To satisfy the requirement that the two-phase voltage and current are orthogonal respectively,the calculation formulas of the compensation component parameters are deduced.Finally,it builds a 10 kV/27.5 kV traction power supply system model on the MATLAB/Simulink software platform to analyze grid-side voltage unbalance degrees when the locomotive power changes from the rated power S to 0.The simulation results verify validity and practicability of the proposed method.
作者
肖彦娟
丁坚勇
张华志
朱炳翔
吕文利
XIAO Yanjuan;DING Jianyong;ZHANG Huazhi;ZHU Bingxiang;L Wenli(School of Electrical Engineering and Automation,Wuhan University,Wuhan,Hubei 430072,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan,Hubei 430063,China)
出处
《广东电力》
2020年第7期57-63,共7页
Guangdong Electric Power
基金
铁道部科技研究开发计划项目(2017K057)
国家自然科学基金项目(51977156)。
关键词
平衡变压器
LC补偿
LL补偿
牵引供电
参数匹配
电能质量
balance transformer
LC compensation
LL compensation
traction power supply
parameter matching
power quality
