Short Circuit Steady State Calculation and Protection Analysis Based on Hybrid Traction Power Supply System

doi:10.11985/2022.02.014

Abstract

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

CLC Number:

U224

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.

Figures/Tables 19

References 24

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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