Step-down negative resistance converter
A converter and step-down technology, which is applied in the field of step-down negative resistance converters, can solve the problems of reducing the integrity and reliability of urban rail transit, high current flow of trains, and shortening power supply distance, etc., so as to reduce costs and Effects of volume, loss reduction, thermal design and heat sink volume reduction
Active Publication Date: 2021-12-28
BEIJING JIAOTONG UNIV
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Problems solved by technology
[0005] 1. Control measures such as changing the power supply voltage of the traction network, shortening the power supply distance, adding special return rails and adding drainage networks are only applicable to new lines
[0006] 2. The use of cathodic protection for easily corroded parts will increase the demand for additional equipment and reduce the integrity and reliability of urban rail transit, which is undoubtedly contrary to urban rail transit whose main purpose is safety and stability
Obviously, the polarity of the output voltage of the negative resistance converter here is changed according to the direction of the train current (traction or braking), but no matter what the polarity of the output voltage of the negative resistance converter is, there is a large train current flowing The problem
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[0077] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0078] Such as figure 1 As shown, it is the invention patent "a system for reducing the rail potential of subway trains" (publication number is: CN108297741 B) image 3 (a), the negative resistance converter is applied to the existing DC traction power supply system of subway rail transit, and the described system for reducing the potential of the subway train track includes: return line 5, negative resistance converter 6 (i.e. figure 1 In the negative resistance converter 6a and negative resistance converter 6b) and several switching units 7 (ie figure 1 In the switch unit 7a, switch unit 7b, ..., switc...
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The invention belongs to the technical field of electrified rail transit, and relates to a step-down negative resistance converter. The circuit is composed of a non-isolated step-down conversion module and a non-isolated negative resistance conversion module. The non-isolated step-down conversion module is used for reducing and converting the voltage of a direct-current traction substation into an intermediate voltage; the non-isolated negative resistance conversion module converts the intermediate voltage into an output voltage, then the intermediate voltage and the output voltage are superposed to serve as the voltage drop of two output connecting ends of the step-down negative resistance converter, and the negative resistance characteristic is obtained according to the relation between the voltage drop and current flowing through the two output connecting ends of the step-down negative resistance converter. The step-down type negative resistance converter does not need an isolation transformer, and train current only has on-state voltage drop of one switch in the non-isolation negative resistance conversion module, so the size reduction and thermal design of the step-down type negative resistance converter are facilitated.
Description
technical field [0001] The invention belongs to the technical field of electrified rail transit, in particular to the technical field of urban rail transit and power electronic converters, and relates to a step-down negative resistance converter, in particular to a step-down type for reducing rail potential and stray current corrosion. Negative resistance converter. Background technique [0002] Urban rail transit has been recognized and favored by the transportation of major cities for its efficient carrying capacity, convenient commuting experience and extremely low exhaust emissions. It is one of the effective ways to promote the sustainable development of cities. However, in urban rail transit, the problems of stray current and track potential caused by the incomplete insulation of the running rail to the ground cannot be ignored. Therefore, the treatment plan for stray current and track potential of urban rail transit has always been concerned. [0003] At present, the...
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IPC IPC(8): H02M3/04H02M3/06H02M3/10B60M5/02
CPCH02M3/04H02M3/06H02M3/10B60M5/02
Inventor 郑琼林杨晓峰赵治钧王淼陈茂鲁顾靖达游小杰刘建强
Owner BEIJING JIAOTONG UNIV