Research And Design On Generalization Of Railway Vehicle Auxiliary Power Supply

In2004, the Ministry of Railways establinshed the general principles for railway technical equipments as follows:the introduction of advanced technology, joint design and production, build China brand. Opened the vigorous development of modernization and localization of technical equipments. Subsequently, China has introduced high-speed EMU, HXD series Electric Locomotive,new-type Metro Vehicles,etc. from Alstom, Bombardier, Siemens and other foreign famous manufacturers of railway technical equipment. Vehicle auxiliary power system as an important technical equipment, has reached a certain level of modernization, however, because of produced by different manufacturers, each vehicle auxiliary power system implementations vary, and application flexibility is poor, need for auxiliary power equipments achieve unification and standardization in the localization process.In this paper, starting from the main components of the Railway Vehicle auxiliar y powe supply, summarized the implementations of the Three-phase AC auxiliary po wer supply and the DC110V auxiliary power supply, illustrated the great differences between these implementations and their advantages and disadvantages. Compared to the auxiliary power supply with AC input, the auxiliary power supply with DC inpu t has following advantages:no need auxiliary winding of traction transformer, not int erfere with the primary winding of traction, can maintain the input DC voltage when short-term loss of power from network side by micro-braking technology (usually not more than one minute). Therefore, this paper focused on some Railway vehicles w hich has auxiliary power supply with DC input, include CRH1, HXD2, Metro with c entralized power supply auxiliary power system (DC1500V).Summarized and analyzed the main application requirements of auxiliary power supply of the above-mentioned vehicles, proposed an auxiliary power supply scheme applicable to each of the abov e-mentioned vehicles. In this scheme, auxiliary power supply achieved by integration of a series of standard inverter modules. Subsequently, selected the main circuit top ology for each standard module by comparing existing converter topologies,and introd uced the technology of DC/DC modules in parallel. For the"DC/DC-600-8" standard module, completed the related physical design of main circuit, driver circuit, internal control power supply circuit, sampling circuit, control software etc. By the physical experiment, the result expresses that the physical module implements converter characteristics of the selected topology and95%efficiency in rated operating conditions, and can working at the required constant voltage, constant current mode, overall achieved the desired performance, verified the realizability of the "DC/DC-600-8" module.Finally, summarized the physical design prosess of "DC/DC-600-8" module, analyzed the realizability of other standard modules, illustrated the feasibility of the proposed auxiliary power supply scheme on the basis of the existing components and technologies.