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A negative sequence compensation device and method for an electrified railway in-phase power supply and transformation system

A technology for electrified railways and substation systems, applied in circuit devices, flexible AC transmission systems, AC networks with the same frequency from different sources, etc. problems such as poor economic indicators, to achieve the effect of superior performance, easy implementation, and reduced electricity consumption

Pending Publication Date: 2018-12-21
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 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; at the same time , since the same substation in the power grid supplies power to multiple traction substations in a radial structure, it will be limited by the length of the radial high-voltage transmission line and the investment, so that the number of traction substations is restricted, which also makes the use of The mileage of the electrified railway that cancels the electric split phase here is limited due to the bilateral connection technology

Method used

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  • A negative sequence compensation device and method for an electrified railway in-phase power supply and transformation system
  • A negative sequence compensation device and method for an electrified railway in-phase power supply and transformation system
  • A negative sequence compensation device and method for an electrified railway in-phase power supply and transformation system

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Embodiment 1

[0032] Such as figure 1 As shown, the embodiment of the present invention provides a negative sequence compensation device for the same-phase power supply and transformation system of electrified railway, and the same-phase power supply and transformation system includes the first traction substation SS 1 , the second traction substation SS 2 , ... and the nth traction substation SS n , n≥2; the first traction substation SS 1 , the second traction substation SS 2 , ... and the nth traction substation SS n are respectively connected to the single-phase high-voltage transmission line HL and the traction network OCS, n≥2; the negative sequence compensation device NCS is installed in the first traction substation SS 1 It includes a three-phase compensation transformer MT, a three-phase reactive power compensator SVG connected to the three-phase compensation transformer MT, and the measurement and control unit MC connected to the three-phase reactive power compensator SVG. In ...

Embodiment 2

[0040] Such as Figure 4 As shown, the embodiment of the present invention provides a negative-sequence compensation method for the same-phase power supply and transformation system of electrified railway using the negative-sequence compensation device described in the second embodiment above, wherein, the allowable negative-sequence capacity of the substation busbar is set as S d , the load power factor of the traction network is 1, and the negative sequence compensation method includes steps as follows:

[0041] The controller CD according to the voltage transformer PT and the first current transformer CT at time t 1 Measured voltage and current to calculate the first active power S 1 (t), according to the voltage transformer PT and the second current transformer CT at time t 2 Measured voltage and current to calculate the second active power S 2 (t);

[0042] The controller CD further calculates the first active power S 1 (t) and the second active power S 2 (t) The s...

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Abstract

The invention discloses a negative sequence compensation device and method of an electrified railway in-phase power supply and transformation system, belonging to the technical field of electrified railway power supply. The in-phase power supply substation system comprises a first traction substation, a second traction substation,... and an n-th traction substation, n >= 2; The first traction substation, the second traction substation,... and the nth traction substation are respectively connected with the single-phase high-voltage transmission line and the traction network; The negative sequence compensation device is installed in the first traction substation and comprises a three-phase compensation transformer, a three-phase reactive power compensator connected with the three-phase compensation transformer and a measurement and control unit connected with the three-phase reactive power compensator. The invention can effectively solve the technical problem that the active power flow of the traction substation group is not changed, and the negative sequence centralized compensation of the traction substation group is solved through the reactive power flow control.

Description

technical field [0001] The invention relates to the technical field of AC electrified railway power supply, in particular to the negative-sequence centralized compensation technology of the same-phase power supply and transformation system with single-phase high-voltage transmission lines. 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 separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/06
CPCH02J3/06H02J3/1821Y02E40/10
Inventor 李群湛
Owner SOUTHWEST JIAOTONG UNIV
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