新型电缆贯通供电系统载流机制

张丽艳; 梁世文; 李鑫; 贾瑛; 韩笃硕; 李群湛

doi:10.3969/j.issn.0258-2724.20200057

新型电缆贯通供电系统载流机制

doi: 10.3969/j.issn.0258-2724.20200057

基金项目: 国家自然科学基金项目（51877182）；四川省科技计划资助（2020YJ0011）

详细信息

作者简介:
张丽艳（1979—），女，讲师，博士，研究方向为牵引供电系统分析和电能质量预测，E-mail：xphfy@home.swjtu.edu.cn

中图分类号: TM922
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出版历程
- 收稿日期: 2020-02-21
- 修回日期: 2020-05-31
- 网络出版日期: 2020-08-24
- 刊出日期: 2021-06-15

Current-Carrying Mechanism of New Continuous Cable Traction Power Supply System

摘要

摘要: 新型电缆贯通供电系统能够取消电分相环节，延长供电距离，并有效治理电气化铁路中的电能质量问题. 但电缆牵引网（cable traction network， CTN）包含不同的电压等级，基波电流要首先经过牵引网的各个环节，最终汇聚到列车负载；而列车发射的谐波电流要经过两级渗透，最终返送到公用电网. 为研究电缆贯通供电系统的载流机制，针对CTN的特殊拓扑结构，根据双口网络分析方法，建立了车网耦合系统等值电路；分析了CTN中的电流传输规律；利用仿真模型，研究了CTN中的谐波电流分布与中心变电所（main substation， MSS）的谐波电流含量. 研究结果表明：当系统内有8个短回路时，单车工况下，基波电流主要在列车所在的单侧供电区间传输；机车电流与MSS电流之比小于4 （牵引变压器变比）；MSS谐波电流含量较列车处最多降低了43.5%.
- 中心变电所 /
- 电缆牵引网 /
- 贯通供电 /
- 电气化铁路 /
- 电流分布
Abstract: Continuous cable traction power supply system is free of electrical phase separation and extend power supply distance, dealing with power quality problems effectively. However, cable traction network (CTN) contains different voltage levels, and the fundamental frequency current flows every CTN link before being used by trains. Moreover, the harmonic current transmitted from trains needs to penetrate in two voltage levels before feeding back to utility grid. In order to study current-carrying mechanism in novel continuous cable TPSS, starting from the special topology of CTN, the equivalent circuit of train-CTN coupling system is established according to dual-port network analysis method. Then current transmission rules in CTN are analyzed. Combined with simulation model, the harmonic current distribution in CTN and harmonic current content of main substation (MSS) are studied. When the new system contains eight short sections for one train, the fundamental frequency current is mainly transmitted by the single-sided CTN where the train locates, and the current ratio between load and MSS is less than four (traction transformer ratio). The harmonic current content of MSS decreases by 43.5% compared with harmonic current content at train.
- main substation (MSS) /
- cable traction network (CTN) /
- continuous power supply /
- electric railroads /
- current distribution

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图 1 电缆贯通供电系统结构

Figure 1. Diagram of continuous cable power supply system

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图 2 输电电缆分布参数电路

Figure 2. Distributed parameter circuit of forward-flow cable

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图 3 接触网-钢轨分布参数电路

Figure 3. Distributed parameter circuit of catenary-rail

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图 4 单相牵引变压器等值电路

Figure 4. Equivalent circuit of single-phase traction transformer

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图 5 电缆贯通供电端口连接示意

Figure 5. Port link diagram of continuous cable power supply system

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图 6 电缆贯通供电系统等值电路

Figure 6. Equivalent circuit of continuous cable power supply system

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图 7 牵引工况列车电流与端电压

Figure 7. Train current and port voltage in traction condition

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图 8 牵引工况列车取流情况

Figure 8. Train collecting currents in traction

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图 9 电缆贯通供电系统仿真模型

Figure 9. Simulation model of continuous cable traction power supply system

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图 10 CTN电流分配

Figure 10. Current distribution in cable traction network

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图 11 车网互联系统谐波阻抗

Figure 11. Harmonic impedance of train-network system

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图 12 CRH2谐波电流实测数据

Figure 12. Measured data of CRH2 harmonic current

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图 13 接触网谐波电流

Figure 13. Catenary harmonic current

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图 14 牵引电缆谐波电流

Figure 14. Traction cable harmonic current

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图 15 MSS谐波电流含量

Figure 15. Harmonic current content of MSS

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表 1 各端口电压计算对比

Table 1. Port voltage calculation comparison kV

方法	U_1out	U_2in	U_5in	U_3out	U_5out	U_L
理论	111.20	111.20	111.20	27.36	27.43	25.89
仿真	111.28	111.28	111.28	27.42	27.48	26.33
误差/%	−0.07	−0.07	−0.07	−0.22	−0.18	−1.67

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表 2 各端口电流计算对比

Table 2. Port current calculation comparison A

方法	I_C	I_C1	I_T1	I_t1	I_t2	I_L
理论	209.55	158.19	92.03	368.14	420.15	788.26
仿真	210.99	159.82	91.61	366.40	408.80	775.08
误差/%	−0.68	−1.02	0.46	0.47	2.77	1.70

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表 3 各个短回路牵引电缆参数

Table 3. Parameters of every short section cable

参数	D1	D2	D3	D4	D5	D6	D7	D8
截面积/mm²	400	400	500	630	630	500	400	400
长度/km	29.0	28.4	28.8	29.4	29.2	28.0	29.0	27.4

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表 4 MSS输出电流

Table 4. Output current in MSS

列车位置	P_L/MW	I_MSS/A	I_L/A	k_b
空载		0.70
D5	20.000	192.90	765.20	3.968
D6	20.000	194.70	768.10	3.937
D7	20.000	197.10	775.90	3.937
D8	20.000	200.10	784.90	3.922

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表 5 再生工况时的MSS输出功率

Table 5. MSS output power in regeneration condition

列车位置	P_MSS /MW	Q_MSS /Mvar	MSS输出电压/kV
空载	0.060	0.050	110.00
D8	−9.860	−2.090	110.32
D7	−9.850	−2.070	110.32
D6	−9.860	−2.080	110.32
D5	−9.880	−2.060	110.32

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表 6 多车时MSS输出功率

Table 6. MSS output power with multi-train work

制动列车位置	P_MSS/MW	P_bra/MW	P_L/MW	再生能量利用率/%
无制动	20.480	10.000	20.000
D6	11.580	10.000	20.000	89
D5	11.780	10.000	20.000	87
D4	12.180	10.000	20.000	83
D3	12.480	10.000	20.000	80

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