光伏接入铁路牵引供电系统谐振特性分析  

Resonance Characteristics Analysis of Photovoltaic Integration into Railway Traction Power Supply System

作　　者：秦浩庭 钟帆 QIN Haoting;ZHONG Fan(Energy Planning Institute of Southwest Electric Power Design Institute Co.,Ltd.,Chengdu 610056,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]中国电力工程顾问集团西南电力设计院有限公司能源规划研究院,成都610056 [2]西南交通大学电气工程学院,成都611756

出　　处：《铁道标准设计》2024年第12期169-175,共7页Railway Standard Design

基　　金：国家自然科学基金项目(51877182)。

摘　　要：针对光伏接入牵引供电系统后可能存在的谐振风险,对加入光伏发电系统的牵引供电系统谐振特性进行研究。采用阻抗分析法及传递函数分析法对接入光伏的牵引供电系统建立谐波阻抗模型,采用频率扫描仿真研究光伏系统背靠背变流器中控制参数、滤波参数对牵引供电系统谐振的影响,发现潜在谐振风险。研究得出:光伏发电系统的接入将使牵引供电系统的阻抗频率特性发生改变,导致谐振点数量增加,同时光伏系统中的控制参数K_(p2)对第一、二谐振的阻抗幅值具有强负向影响,而对谐振频率的影响较弱,K_(r)对谐振无明显影响,滤波参数L_(1)、L_(2)、C均对第一、二谐振的谐振频率呈强负向影响,对第二谐振的阻抗幅值呈强正向影响,L_(1)对第一谐振的阻抗幅值呈强正向影响,而L_(2)、C对第一谐振阻抗幅值的影响与L_(1)相反。因此,以转移谐振频率或降低阻抗幅值为目的对以上参数进行合理设计,可以预防谐振事故的发生。This study investigates the resonance characteristics of the traction power supply system regarding the potential resonance risks when photovoltaic(PV)power generation systems are integrated.Firstly,a harmonic impedance model of the traction power supply system with integrated PV was established using impedance analysis and transfer function methods.Frequency scan simulations were then conducted to examine the effects of control and filter parameters in the back-to-back converters of the PV systems on the resonance in the traction power supply system,revealing potential resonance risks.The study concluded that the integration of photovoltaic systems changed the impedance frequency characteristics of the traction power system,increasing the number of resonance points.Specifically,the control parameter K_(p2) in the photovoltaic system had a strong negative impact on the impedance amplitude of the first and second resonances,while exerting a weaker impact on the resonance frequency.The parameter K_(r) showed no obvious influence on resonance.Meanwhile,filter parameters L_(1),L_(2),and C strongly negatively affected the resonance frequencies of both the first and second resonances,while positively influencing the impedance amplitude of the second resonance.The parameter L_(1) had a strong positive influence on the impedance amplitude of the first resonance,while L_(2) and C had opposite effects.Therefore,a reasonable design of the above parameters aiming at shifting resonance frequencies or reducing impedance amplitudes can help prevent resonance incidents.

关 键 词：铁路 牵引供电系统 光伏发电系统 背靠背变流器 频率扫描仿真 谐振特性 

分 类 号：U223.1[交通运输工程—道路与铁道工程] TM922.3[电气工程—电力电子与电力传动]