Conference Proceeding

Mode of short-circuit state operation in 24-pulse uncontrolled bridge rectifier

Sch. of Electron., Southwest Jiaotong Univ., Chengdu, China
12/2009; DOI:10.1109/ICEMS.2009.5382955 pp.1 - 5 In proceeding of: Electrical Machines and Systems, 2009. ICEMS 2009. International Conference on
Source: IEEE Xplore

ABSTRACT Electrical Supply Substations (ESS) in modern railway DC systems are widely equipped with 24-pulse rectifiers, because such a converter provides a good promise between dc-side voltage ripple and ac-side current harmonic content. Accurate determination of transient dc-side short-circuit current is important for design of protection devices and power equipment. Firstly, the mode of short-circuit operation in 24-pulse converter is analyzed; then, the general method to calculate the short-circuit current is obtained by combining both the impedance calculation and short-circuit current formula in short-circuit state; finally, this method is simulated to compare with the transient and steady-state short-circuit currents with its own parameters of the transformer in Matlab. The figure shows that two curves are overlapping, so it proves that the method in this paper is correct.

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Keywords

24-pulse converter
 
24-pulse rectifiers
 
ac-side current harmonic content
 
Accurate determination
 
dc-side voltage ripple
 
Electrical Supply Substations
 
good promise
 
impedance calculation
 
Matlab
 
modern railway DC systems
 
own parameters
 
power equipment
 
protection devices
 
steady-state short-circuit currents
 
transient
 
transient dc-side short-circuit current