Traction power supply system and method for converting two-phase symmetrical alternating current into single-phase alternating current
A traction power supply system, single-phase AC technology, applied in control systems, conversion equipment that can be converted to DC without intermediate conversion, electric components, etc., can solve the problems of three-phase unbalance, low cost, and achieve high reliability. , the effect of low cost and simple structure
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0022] This embodiment provides a traction power supply system that converts two-phase symmetrical alternating current into single-phase alternating current, such as figure 1 As shown, it includes a Scott transformer 100 and an AC phase-changing motor 101 for converting two-phase symmetrical AC into single-phase AC;
[0023] The output end of the Scott transformer 100 is electrically connected to the input end of the AC phase-changing motor 101 for converting the two-phase symmetrical alternating current into a single-phase alternating current, and is used to convert the 330kV, 220kV or 110kV three-phase alternating current from the public grid into 13.75kV two-phase symmetrical alternating current;
[0024] The AC phase-changing motor 101 for converting two-phase symmetrical alternating current into single-phase alternating current is used to transform 13.75kV two-phase symmetrical alternating current into 27.5kV single-phase alternating current and output the catenary.
[0...
Embodiment 2
[0030] This embodiment provides a method of using the two-phase symmetrical AC described in Embodiment 1 to convert the single-phase AC into a traction power supply system, specifically:
[0031] Scott transformer converts 330kV, 220kV or 110kV three-phase AC from the public grid into 13.75kV two-phase symmetrical AC;
[0032] The two-phase symmetrical alternating current into single-phase alternating current AC phase-changing motor transforms the 13.75kV two-phase symmetrical alternating current into a 27.5kV single-phase alternating current output catenary.
[0033] In the above method, no matter how the single-phase traction load changes randomly, the load current on the input side of the AC variable-phase motor of the two-phase symmetrical AC to single-phase AC is always kept symmetrical, thereby ensuring the three-phase current on the input side of the Scott transformer Symmetrical, there is no negative sequence current in the traction power supply system.
[0034] The p...
Embodiment 3
[0038] This embodiment provides application examples for Embodiment 1 and Embodiment 2.
[0039] The three-phase power supply A, B, and C provided by the public grid are input to the Scott transformer, and the Scott transformer transforms the three-phase power supply into a two-phase symmetrical alternating current U T and U M , the effective values of the two are equal, U T Advance U M 90°. The two-phase symmetrical AC to single-phase AC phase-changing motor is connected to the secondary side of the Scott transformer, and the input power is U T and U M , the secondary winding of the AC phase changing motor will be U T Phase shift backward 45°, U M Shift the phase forward by 45°, and the AC phase-changing motor outputs a single-phase power supply as U D ; D Than U T After 45°, than U M Leading 45°, as attached figure 2 shown. Single-phase power supply U D output to catenary, when an electric locomotive passes by, the output current I D , the input current of ...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More