The Analysis About The Characteristics Of Locomotive Transformer And Converter System

There is a history of 150 years from the German manufacturing first electric locomotive to now, China has also produced the first electric locomotive in 1958. Electrified railway traction power supply network can be divided into DC and AC. Electric locomotive, which also can be divided into "DC/DC", "AC/DC" and "AC-DC-AC". DC power supply voltage is 1.5kV and 3kV, AC voltage is 15 kV, 20 kV, 25kV/16.67 Hz, 50 Hz, 60 Hz. Foreign even exist double system which is supplied by DC and AC power system. The development of the has been a long period of time, before the beginning of twentieth Century, the speed of electric locomotive is rarely more than 200 km, with the opening of the Shinkansen in Japan in 1964, ushered in the high-speed rail system, at speeds of up to 400~500km. High speed railway in China had a rapid development in the past 10 years, currently is the state which has the longest operating mileage of GaoTie.With the development of railway electrification, especially for High-speed Rail, there are many issues worthy of further study. In this paper mainly analyse the main transformer of electric locomotive and traction system. Firstly,briefly introduced the development situation at home and abroad in recent years. Then, deeply analyzing the calculation of the short-circuit impedance of multi winding locomotive transformer, deducing the calculation formula of short circuit impedance which is based on the equivalent circuit of inductance matrix; At the same time analyzing the calculation of port impedance, the calculation formula is given, also discussing the influence of related parameters. In addition, analyzed the output waveform of rectifier, inverter for single winding and double winding transformer based on the MATLAB simulation, the influence of circuit and PWM parameters on the harmonic content is discussed in detail. Finally, in view of the electric locomotive system is a typical harmonic source load, this paper analyzed the performance of the equipment which is under the influence of harmonic, including the main transformer copper loss, iron loss, efficiency, also the waveform distortion of system voltage; At the same time, this paper give a brief review of the harmonic control of electrified railway system.