Papers by Keyword: Electric Locomotive

Abstract: At present, the control system of electric traction motors is widely used in four-regulators collected on thyristors in a bridge rectifier circuit. The feature switching processes in them are needed to introduce an artificial delay of the thyristors opening angle, which reduces the average value of the power factor up to 0.8. The article assesses the effectiveness of the combination of the rectified voltage from the point of view of increasing the energy performance of the band rectifiers for controlling the traction motor freight locomotives operating on alternating current. With this regulation the greatest effect is achieved in the first control zone, under normal conditions when the power factor is particularly low (0.2 ... 0.6). The expected improvement of the average power factor of the first zone will be about 22%, and taking into account the duration of the performance in all working areas, it should be about 5-10%

Abstract: The paper introduces the structure of locomotive energy consumption monitoring system, technical parameters and the method of software design. The system uses electric energy metering chip CS5463, ARM kernel STM32F103R8T6, GPRS wireless communication module and RS485 communication interface to realize the multi-system locomotive AC and DC measurement, remote meter reading and other devices and locomotive communication connection. The liquid crystal display LCD stores the locomotive power information, the current, voltage, power and energy data with their own real-time clock time-sharing data fragmentation such as type test on the system, the system of high precision, strong anti-interference ability, low power consumption, safety etc.

Abstract: Since HXD₃/HXD_3C electric locomotive is put into use, the potential transformer cracks frequently. This paper summarizes several main reasons why HXD₃/HXD_3C electric locomotive potential transformer crack, and also proposes targeted solutions to promote the potential transformer reliability.

Abstract: The operation control of coke oven electric locomotive is an essential component of automatic control of coking manufacture. It is the main problem that coking enterprises should deal with in order to ensure the safety of production. In order to change and improve the actuality of manual driving, low positioning precision, high labor intensity and low producing efficiency, this paper proposes a practical and reliable automatic control scheme of electric locomotive based on successful experiences domestic and oversea.This scheme solves the key problem of electric locomotive automatic control-precision positioning, which containes a three-laser contraposition sensor and a positioning and lightproof piece used to ensure the accuracy of parking position detection, and a segmented deceleration control method used to ensure the automatism of parking brake. According to calculations and analysis, it is shown that the scheme could meet the system precision positioning requirements.

Abstract: This article has developed automatic control operation mode of safety monitor and control system of electric locomotive operation (online mode), it i improves the security and efficiency of electric locomotive servicing work. Operation of the entire system has been simulated in laborator, This has laid a good foundation for the promotion in railway system.

Abstract: To avoid safety hazards in the mine electric locomotive transporting, designed an anti-collision warning system for electric locomotive. The system took MCU AT89C52 as core controller, including ranging module, speed measuring module, display module, warning module and anti-interference design. The system used ultrasonic sensor and incremental rotary encoder respectively to measure distance and velocity, and then obtained the distance and velocity data through MCU AT89C52. Through analyzing these data, the system can alarm and stop the locomotive, and then ensure the safety of locomotive and workers. Therefore, the system has a very good market prospect.

Abstract: The complexity of locomotive onboard devices and their coupling relationship are increasing along with the high-speed development of our nation’s railway vehicle technology. By combining diagnostic technique with expert system and using fault trees and rules, a new monitor and diagnosis method has been proposed on the overall view of railway vehicles to enhance the diagnosis accuracy. This research is supported by the National High Technology Research and Development Program ("863" Program) of China, the result of this research has been statically tested on relevant electric locomotives.

Abstract: The high-speed railway based on electromechanical integration develops rapidly in China in recent years. In order to improve research for electrified railway, a model of AC-DC-AC electric locomotive is established using electro- magnetic transient software PSCAD/EMTDC. In this paper, a single-phase tri-level rectifier of unit power factor and its control strategy of direct transient current control method are introduced at first. And then the working principles of the voltage space vector control strategy of inverter and the vector control strategy of cage motors are analyzed. The inverter and the motors must be as a whole because of the realization of motor vector control based on SVPWM inverter. At last, a model is established and the correctness and effectiveness of the model can be verified by the corresponding theory results. The simulation model is useful for the analysis of low frequency resonance in locomotives. The results will be applied in the research of mechanics and electric coupling in high speed electrified railway.

Abstract: The application of electric power, which acts as a pillar energy and economic artery in modern society, is one of the most important symbols of the level of development and comprehensive national power of a country. Var is a crucial factor for the design and operation of AC power systems, and is closely bound up with the safety, stabilization, and economical operation of power systems. With the development of electrified railway, developing the var compensation strategy vigorously has important senses in theory and practice. In this article, synthetically considering technique and economic leval of power systems in our country, parameters design and verification and specific engineering application of TSF var compensation method are presented. This method is a preferable one for resolving undesirable effect on power systems of electrified railway, especially having dynamic and real time characteristics of var compensation.

Abstract: A safety network system is designed based on PROFIBUS-DP field bus, according to actual servicing work situation and control requirements for electric locomotive servicing work. The system realizes communication between first class master station and third equipment through using PROFIBUS-DP bus protocol. It also realizes interactive operation between slave station and non-contact IC card, meanwhile, slave station and MCU system. In addition, this article has analyzed the multi-task scheduling mechanism and data communication security on monitoring network system in detail as well. Results show that the system has higher application value through entire debugging and testing on network control system.