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Electrified railway external power grid access scheme optimization design method

A technology for electrified railways and external power grids. It is applied in circuit devices, AC network circuits, and multi-phase network asymmetry reduction. It can solve resource waste, external power grid access solutions that are not globally optimal or satisfactory, and cannot guarantee PCC. and other problems, to achieve the effect of saving investment, facilitating calculation and reducing compensation capacity

Active Publication Date: 2019-04-26
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) Only a scheme that has a small impact on the voltage unbalance of PCC can be given, and it cannot guarantee that the voltage unbalance of PCC meets the requirements in GB / T 15543-2008
[0005] (2) The capacity of the negative sequence compensation device that matches the external grid access scheme cannot be given, resulting in the external grid access scheme not being the global optimal or satisfactory solution, resulting in a large waste of resources

Method used

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  • Electrified railway external power grid access scheme optimization design method
  • Electrified railway external power grid access scheme optimization design method
  • Electrified railway external power grid access scheme optimization design method

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Embodiment

[0091] The topological structure of the embodiment in the present invention is as figure 1 shown. Comparing three external power grid access schemes, the combination u of the traction transformer wiring form in each traction substation is shown in Table 2.

[0092] Table 2. Traction transformer wiring combination u

[0093]

[0094] The commutation combination w of each traction substation is shown in Table 3

[0095] Table 3. Alternate Commutation Combination w

[0096]

[0097] The parameters of the three-phase power grid are shown in Table 4.

[0098] Table 4. Three-phase grid parameters

[0099]

[0100] After programming calculation, the calculation results are shown in Table 5.

[0101] Table 5. Calculation results

[0102]

[0103] Table 4 shows the calculation results of three external grid access schemes; according to Table 4, it can be known that the external grid access scheme f(w 2 ,u 2 ) is the global optimal scheme, the capacity of the negativ...

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Abstract

The invention discloses an electrified railway external power grid access scheme optimization design method. The electrified railway external power grid access scheme optimization design method comprises the following steps: data of the loading process of a traction substation and power grid data are obtained; an external power grid access scheme database is built, and a three-phase equivalent model of the traction substation is built; a three-phase power grid-traction power supply system unified model is built, and positive and negative sequence voltage distribution on all buses is solved; the effective apparent power of the traction substation is calculated; the limit value of the unbalance degree of the voltage which is allowed to be injected into a public power grid is pre-evaluated; the capacity of a full-line compensation device is calculated; the objective function of an optimization model is built; constraint conditions of the voltage unbalance degree of all the buses are built; and the optimization model is solved to complete the electrified railway external power grid access scheme optimization design. A reasonable external power grid access scheme can be obtained, and the problems caused by insufficient subjective experience of designers are avoided; and meanwhile, the compensation capacity of the compensation device can be decreased to save the investment.

Description

technical field [0001] The invention relates to the field of optimal design of a traction power supply system, in particular to an optimal design method for an external grid connection scheme of an electrified railway. Background technique [0002] The 25kV power frequency single-phase traction power supply system is the core component of the electrified railway. However, as more and more high-speed railway lines are put into operation, the power quality problems caused by the traction power supply system in the public grid are becoming more and more prominent, especially the problem of voltage imbalance. This problem is particularly prominent in the central and western regions of China where the power grid structure is weak. Therefore, in the design stage of the traction power supply system, it is necessary to focus on how to solve the voltage imbalance problem generated by it, and at the same time meet the requirements of economy. [0003] The external grid connection sc...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCH02J3/26H02J2203/20Y02E40/50
Inventor 陈民武陈垠宇刘元立陈玲谢崇豪张迪雅吕亚博
Owner SOUTHWEST JIAOTONG UNIV
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