Simulation and algorithm development of protection scheme in DC traction system

Abstract

This paper presents a simulation model of DC traction system which is based on bilateral power supply mode. The model of two substation rectifiers in one track section has been proposed which is according to practical situation. The modeling was conducted with respect to the variations of the starting-up process and short circuit conditions. By comparing and investigating the simulation results of short circuit current and the train starting current, more effective algorithms such as DDL protection has been proposed. The paper presents the principle and analysis of DDL protection scheme, which shows effectiveness of DDL protection for fault detection and discrimination against train starting currents in the DC transit system.

Simulation and protection algorithm development of sequential tripping in DC traction system

“…The modeling of DC transit system is implemented based on the following principles [5]: (i) The track section is energized by two substations. Each substation has two inlet wires.…”

“…(iv) One train is started from substation B to substation A at 0.04s, the distance between train and substation B is 1500m. The details of modeling of DC train is presented by [5].…”

“…The protection scheme combines current rising rate (di/dt) and current increment (ΔI) functions with different time delays (ΔT) to provide comprehensive protection for the whole track section, the testing results of this protection algorithm is proposed by [6].…”

“…Therefore, the possibility of mis-operation cannot be ruled out with the traditional protection which cannot protect the whole feeder line. A program is written for the protection algorithm which is used to simulate the operation of the relay at substation A and substation B [6]. The performance of the protection algorithm is shown in Fig.…”

Simulation and Protection Scheme analysis of Articulated Neutral Section Insulator in DC Railway System

“…Furthermore, practical situations with train passing neutral section also need to be simulated. Comprehensive model of DC railway system and Simulation and Protection Scheme analysis of Articulated Neutral Section Insulator in DC Railway System L Yu [1] , J H He [1] , Z Q Bo [2] , M X Li [1] , T Yip [2] , A Klimek [2] [1] Beijing Jiaotong University, China [2] AREVA T&D Automation, UK I 978-1-4244-4813-5/10/$25.00 ©2010 IEEE simulation results is proposed by [2]. This paper presents further simulation results of train passing neutral section with discussions on protection algorithms which is used to discriminate the current of train passing neutral section from remote short-circuit current.…”