基于混合牵引供电系统的短路稳态计算及保护分析*

doi:10.11985/2022.02.014

摘要/Abstract

摘要：

针对24脉波整流机组和逆变能馈装置并联耦合的混合牵引供电系统,研究其直流侧短路故障发生时的电流特性,并制定相应的直流侧短路保护整定参数。首先计算了整流机组和能馈装置单独短路情况下的等效参数,并根据叠加定理研究混合牵引供电系统的直流侧短路特性。然后对牵引供电系统继电保护类型及保护整定设计原则进行介绍分析。搭建含逆变能馈装置的混合牵引供电系统仿真模型,对含逆变能馈装置的直流牵引供电系统直流侧近、远端短路进行仿真,验证等效计算结果,根据仿真电流波形设定适合混合牵引供电系统的保护整定参数,判断不同短路距离时启用的保护类型,确定混合牵引供电系统能正确切断电路,保障城市轨道交通系统的安全运行。

关键词: 混合牵引供电, 外特性曲线, 逆变能馈装置, 系统短路仿真, 短路保护

Abstract:

For the hybrid traction power supply system with parallel coupling of 24 pulse rectifier unit and inverter energy feed device, the current characteristics of DC side short-circuit fault are studied, and the corresponding DC side short-circuit protection setting parameters are formulated. First, the equivalent parameters of rectifier unit and energy feed device are calculated, and the DC side short-circuit characteristics of hybrid traction power supply system are studied according to the superposition theorem. Then the relay protection types and protection setting design principles of traction power supply system are introduced and analyzed. The simulation model of hybrid traction power supply system with inverter energy feed device is built to simulate the short circuit at the near and far ends of DC side of DC traction power supply system with inverter energy feed device, and the equivalent calculation results are verified. The protection setting parameters of the hybrid traction power supply system are set according to the simulated current waveform, and the protection types enabled at different short-circuit distances are judged. It is determined that the hybrid traction power supply system can cut off the circuit correctly to ensure the safe operation of urban rail transit system.

Key words: Hybrid traction power supply, external characteristic curve, inverter energy feeding device, short circuit simulation of system, short circuit protection

中图分类号:

U224

成庶, 周天娇, 向超群. 基于混合牵引供电系统的短路稳态计算及保护分析^*[J]. 电气工程学报, 2022, 17(2): 122-130.

CHENG Shu, ZHOU Tianjiao, XIANG Chaoqun. Short Circuit Steady State Calculation and Protection Analysis Based on Hybrid Traction Power Supply System[J]. Journal of Electrical Engineering, 2022, 17(2): 122-130.

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参数	数值
穿越阻抗x_k/Ω	0.040 5
半穿越阻抗x_b/Ω	0.065 8
系统短路电抗x_s/Ω	0.023 2
换相电抗x_c/Ω	0.089 0
耦合系数k	0.431 5
空载电压U_d0/V	1 650

等效区间	等效电压$U_{eq1}^{’}$/V	等效内阻$R_{ eq1}^{’}$/Ω	负载电流范围/A
一	1 650	0.021 3	0<I_d<5 200
二	1 711	0.033 2	5 200< I_d <10 180
三	1 848	0.046 6	10 180< I_d <20 140
四	2 141	0.061 1	20 140< I_d <24 625
五	3 438	0.113 8	24 624< I_d

参数	数值
变压器阻抗X_T/Ω	0.024
交流电感等效阻抗X_l/Ω	0.039 3
交流电源系统阻抗X_s/Ω	0.016 7
交流侧总阻抗X_p/Ω	0.08
空载电压V_d0/V	1 350

等效区间	等效电压U_eq2/V	等效内阻R_eq2/V	负载电流范围/A
一	1 350	0.076 3	0<I_d<4 419
二	1 598	0.132 3	4 419< I_d <7 654
三	2 338	0.229 0	7 654< I_d

短路点距离/km	短路电流/A	计算值/A	仿真值/A	误差(%)
0.04	I_d	39 193	38 610	1.5
	I_ru	29 391	29 405	-0.04
	I_ef	9 802	9 250	1.4
2	I_d	11 218	10 880	3.0
	I_ru	10 945	10 450	4.4
	I_ef	273	430	-1.4