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Emergency control method for improving transient angle stability of single-channel interconnected power grid

An interconnected power grid and emergency control technology, applied in the direction of reducing/preventing power oscillation, can solve problems such as transient power angle instability of the power grid, and achieve the effect of improving the ability to resist serious faults and reducing the risk of transient instability.

Active Publication Date: 2018-09-28
NANJING NARI GROUP CORP +2
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, provide an emergency control method for improving the stability of the transient power angle of the single-channel interconnected power grid, and solve the problem of transient power angle instability in the power grid caused by high-power disturbance events in the prior art technical issues

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  • Emergency control method for improving transient angle stability of single-channel interconnected power grid
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  • Emergency control method for improving transient angle stability of single-channel interconnected power grid

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0039] As shown in the figure, it is a flow chart of the method of the present invention, which specifically includes the following steps:

[0040] Step 1: Arrange according to the operation mode of the power system to obtain key parameter information

[0041] Determine the section of the long-distance AC cross-regional transmission channel in the UHV interconnected grid, and obtain the inertia constants of the regional grids at both ends of the section. The inertia constant of the regional grid A is denoted as J 1 , the inertia constant of regional power grid B is denoted as J 2 ; The damping ratio of the dominant oscillation mode between the regional grids on both sides is denoted as ζ; the ...

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Abstract

The invention discloses an emergency control method for improving transient angle stability of a single-channel interconnected power grid. According to the power fluctuation track characteristics, therisk of transient angle instability is identified through comparing the relation between maximum transient power of a section of an extra-high voltage tie line, theoretical quasi-steady-state power and a first swinging peak value of the theoretical power in a transient process of large-scale power transfer, and a corresponding emergency control strategy is provided, so that a probability of powergrid instability after a fault is reduced, the safety stability of the power grid is improved, and a decision support is provided for an emergency control strategy of an electric power system.

Description

technical field [0001] The invention relates to an emergency control method for improving the transient power angle stability of a single-channel interconnected power grid, which belongs to the technical field of electric power automation. Background technique [0002] Regional grid interconnection has become a major way of modern power system development. With the Changzhi-Nanyang-Jingmen UHV demonstration project put into operation, the two major regional power grids in North China and Central my country have formed an interconnected power system through the UHV AC connection line. For the AC synchronous power grid using AC interconnection, a large disturbance in a certain area will not only have an impact on the stability of the regional power grid, but will also have an impact on the stability of other regional power grids through inter-regional tie lines. In severe cases, it may even It will lead to out-of-step oscillation and decoupling of the regional power grid. ...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 吴雪莲刘福锁李兆伟李威薛峰黄慧王玉朱玲张红丽谭真胡阳郄朝晖张子龙张倩赵彦丽
Owner NANJING NARI GROUP CORP
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