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Negative sequence compensation control device, system and method of traction substation group

A technology for traction substations and compensation systems, applied in circuit devices, flexible AC transmission systems, reactive power adjustment/elimination/compensation, etc., can solve problems such as high technical difficulty, poor network loss economic indicators, and impracticability. Achieve the effects of advanced technology, reduced electricity consumption, and simplified overall structure

Active Publication Date: 2018-11-30
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that when the scale of the traction substation group is larger, the scale of the active power flow that needs to be changed is larger, the electrical distance is longer, the technical difficulty is greater, and the economic index of network loss is worse, or even impossible

Method used

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  • Negative sequence compensation control device, system and method of traction substation group
  • Negative sequence compensation control device, system and method of traction substation group
  • Negative sequence compensation control device, system and method of traction substation group

Examples

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Embodiment 1

[0041] Such as figure 1 and figure 2 As shown, Embodiment 1 of the present invention provides a negative sequence compensation measurement and control device for a traction substation group, and the traction substation group includes the first traction substation SS 1 , the second traction substation SS 2 , ... and the nth traction substation SS n , wherein the negative sequence compensation measurement and control device MC includes the first traction substation SS 1 The first current transformer CT 1 and the first voltage transformer PT 1 , the second traction substation SS 2 The second current transformer CT 2 and the second voltage transformer PT 2 ,..., the i-th traction substation SS i The i-th current transformer CT i and the i-th voltage transformer PT i , and the nth traction substation SS n The nth current transformer CT n and the nth voltage transformer PT n , the optical fiber network FO and the controller PS; the input terminal of the controller PS i...

Embodiment 2

[0044] Such as image 3 and Figure 4 As shown, Embodiment 2 of the present invention provides a negative sequence compensation system for a traction substation group, and the traction substation group includes the first traction substation SS 1 , the second traction substation SS 2 , ... and the nth traction substation SS n , the negative sequence compensation system NCS is installed in the first traction substation SS of the traction substation group 1 Among them, the negative sequence compensation system NCS includes a three-phase transformer MT for transmitting negative sequence power, a three-phase reactive power compensation device SVG for generating negative sequence components, and a negative sequence compensation measurement and control device MC; the three-phase The secondary side of the transformer MT is connected to the three-phase reactive power compensation device SVG.

[0045] In the embodiment of the present invention, the first traction substation SS 1 A ...

Embodiment 3

[0051] Such as Figure 5 As shown, the third embodiment of the present invention provides a negative-sequence compensation method for traction substation groups, wherein the allowable negative-sequence capacity of substation busbars is set to be S d , the load power factor of the traction network is 1, and the negative sequence compensation method includes steps as follows:

[0052] The controller PS according to the first traction substation SS at time t 1 The first current transformer CT 1 and the first voltage transformer PT 1 , the second traction substation SS 2 The second current transformer CT 2 and the second voltage transformer PT 2 , ..., and the nth traction substation SS n The nth current transformer CT n and the nth voltage transformer PT n The current and voltage measured at the same time are respectively calculated to correspond to the first traction feeder F 1 The first active power S 1 (t), the second traction feeder F 2 The second active power S 2...

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Abstract

The invention provides a negative sequence compensation control device, system and method of a traction substation group. The negative sequence compensation control device comprises n current transformers and n voltage transformers of n traction substations in the traction substation group, a fiber network and a controller, wherein an input end of the controller is connected with a first current transformer and a first voltage transformer of a first traction substation and then is connected with the current transformers and the voltage transformers of other (n-1) traction substations by the fiber network, and an output end of the controller is connected with a control end of a three-phase passive power compensation device. By the negative sequence compensation control device, the equipmentproblem of concentrated compensation of dispersed negative sequences generated by each traction substrate and the technical problem of real-time compensation can be effectively solved without changing active power flow of a traction network of the traction substation group.

Description

technical field [0001] The invention relates to the field of AC electrified railway power supply, in particular to a negative sequence compensation measurement and control device, system and method for a traction substation group. Background technique [0002] Electrified railways generally adopt the single-phase power frequency AC system powered by the public power system. In order to make the single-phase traction load be distributed as balanced as possible in the three-phase power system, the electrified railway often adopts the scheme of rotating phase sequence and separate phase and partition power supply. The adjacent power supply areas at the phase-splitting partitions are separated by phase-splitting insulators to form electrical phase-splitting, referred to as phase-splitting. The electric phase separation link is the weakest link in the entire traction power supply system, and the excessive phase separation of trains has become the bottleneck of traction power supp...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCH02J3/1821Y02E40/10
Inventor 李群湛
Owner SOUTHWEST JIAOTONG UNIV
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