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Method and device for determining short-circuit ratio of new energy field station

A determination method and new energy technology, applied in the direction of reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve problems such as weak power grid strength and prominent stability problems of new energy power generation systems

Pending Publication Date: 2021-03-19
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the large-scale use of new energy power generation in remote areas far from the load center, the strength of the power grid is weak, and the stability of the new energy power generation system is prominent

Method used

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  • Method and device for determining short-circuit ratio of new energy field station
  • Method and device for determining short-circuit ratio of new energy field station
  • Method and device for determining short-circuit ratio of new energy field station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Such as image 3 As shown, the method for determining the short circuit ratio proposed by the present invention includes:

[0088] Determine the short-circuit capacity of the bus side in the collection station according to the short-circuit capacity of the connection point of the collection station;

[0089] Determine the short-circuit capacity of each new energy station grid-connected point in the collection station according to the short-circuit capacity of the busbar side in the collection station;

[0090] Determine the short-circuit ratio of each new energy station in the collection station according to the short-circuit capacity of each new energy station in the collection station;

[0091] Wherein, the short-circuit capacity of the busbar side in the collection station includes: the short-circuit capacity of the high-voltage busbar side, the short-circuit capacity of the medium-voltage busbar side and the short-circuit capacity of the low-voltage busbar side.

...

Embodiment 2

[0151] Such as Figure 6a As shown, the parallel connection between the collection stations, taking the collection station 2 as an example:

[0152] The rated capacity of 220 / 500kV step-up transformer in junction station 2 is 1500MW, then according to Figure 6a With the line length and line parameters marked in , the line impedance of junction station 2 can be obtained as:

[0153] Z=56.1Ω, Z H,L =16.67Ω, Z 1 =6.32Ω, Z 2 = 0.22Ω, Z 3 =6.93Ω, Z 4 =5.63Ω, Z 5 = 1.99Ω;

[0154] Line parameters: 500kV transmission line model is LGJK-4*630mm 2 , the typical value of impedance is 0.275Ω / km, and the model of 220kV transmission line is LGJ-400mm 2 , the typical value of impedance is 0.433Ω / km;

[0155] Determine the short-circuit capacity in junction 2:

[0156] Such as Figure 6b As shown, given S C 0 =1650, then

[0157] Determine the short-circuit capacity of the wind farm 1, wind farm 2, wind farm 3, wind farm 4 and wind farm 5 grid connection points in the collec...

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Abstract

The invention relates to a method and device for determining the short-circuit ratio of a new energy field station. The method comprises the steps: determining the short-circuit capacity of a bus sidein a gathering station according to the short-circuit capacity of a grid-connected point of the gathering station; determining the short-circuit capacity of each new energy field station grid-connected point in the gathering station according to the short-circuit capacity of the bus side in the gathering station; and determining a short-circuit ratio of each new energy field station in the gathering station according to the short-circuit capacity of each new energy field station grid-connected point in the gathering station. According to the invention, the obtained short-circuit ratio of thenew energy field station is more accurate, and accurate support can be provided for new energy grid-connection oscillation evaluation and new energy planning management.

Description

technical field [0001] The invention relates to the field of new energy technology, in particular to a method and device for determining the short-circuit ratio of a new energy station. Background technique [0002] Due to the large-scale use of new energy power generation in remote areas far from the load center, the strength of the power grid is weak, and the stability of the new energy power generation system is prominent. New energy grid-connected oscillation is the main factor affecting the stability problem. Its essence is the instability problem caused by the interaction between the new energy station and the weak grid. The weaker the grid connected to the new energy station, the possibility of oscillation Therefore, the assessment of the strength of the power grid is one of the key contents of the oscillation risk assessment of the new energy grid-connected system. [0003] In power system analysis, the strength of the power grid is usually described by the short-ci...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24
Inventor 刘纯汪海蛟何国庆王伟胜李光辉曲春辉孙文文李洋孙艳霞张兴
Owner CHINA ELECTRIC POWER RES INST
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