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Method for dividing coherent stability regions of strong-connection power grids

A technology for stabilizing areas and power grids, applied in the direction of electrical components, circuit devices, AC and DC network circuit layout, etc., can solve problems such as the difficulty of capturing out-of-step centers, and achieve the avoidance of power grid stability damage accidents, huge economic and social benefits, and safety Stable operation and reliable effect

Inactive Publication Date: 2013-09-18
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0020] based on The desynchronization criterion of the system can reflect the change of the lowest voltage in the process of system out of step and can accurately judge whether the system is out of step. This method can automatically adapt to various operating modes of the system and changes in the system structure, and can capture When the out-of-step center appears, but it is difficult to capture the position of the out-of-step center, other auxiliary criteria are needed

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  • Method for dividing coherent stability regions of strong-connection power grids

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Embodiment Construction

[0035] In order to better understand the above technical solutions of the present invention, a further detailed description will be given below in conjunction with the drawings and embodiments.

[0036] Large-scale interconnected power grids generally have multiple decoupling points, and their positions are determined by off-line calculations. Because of the dispersion of decoupling points, the actions of out-of-synchronization decoupling devices installed at these points must be coordinated from the perspective of the entire network. When the system loses synchronization, it is a relatively consistent view to decompose the out-of-synchronization section as soon as possible. When several points are on the out-of-synchronization section, there is a problem of coordination of the device's actions. At present, the coordination and cooperation methods of the unloading devices are all in situ, and there are mainly the following methods:

[0037] (1) For the same station, the doubl...

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Abstract

The invention discloses a method for dividing coherent stability regions of strong-connection power grids, relates to methods for judging the stability of alternating-current and direct-current power grids, and particularly relates to a method for judging and dividing coherent stability regions of strong-connection power grids. The method includes steps of performing EEAC (extent equal area criterion) simulation on faults of the strong-connection power grids and determining potential instability modes; identifying coherent clusters on the basis of power-angle response curves of power generators according to power-angle swing curves of the power generators, dividing each system into two non-null complementary clusters and reflecting the two non-null complementary clusters into corresponding single-machine planes; finding possible instability clusters in subsequence periods according to instability tracks, dividing the disturbed systems into coherent instability regions and the coherent stability regions so that the stability of the systems can be analyzed according to equal area criteria. The power-angle swing curves of the power generators are obtained by means of transient simulation. The method has the advantages that support is provided for configuring out-of-step separation devices and out-of-step separation schemes for third defensive lines of the power systems, accordingly, power grid stability disruption accidents are effectively prevented, and safe and stable running of large-scale power grids is reliably guaranteed.

Description

technical field [0001] The invention relates to a method for judging the stable state of an AC and DC power grid, in particular to a method for judging and dividing a coherent stable area for a strongly connected power grid. Background technique [0002] The practice of large-scale power grid operation shows that some complex faults caused by various factors that are difficult to predict in advance may occur in the power system, and may cause out-of-synchronization between different generator groups. In this case, if the decoupling of out-of-step generating units cannot be realized quickly, it may lead to the expansion of the accident, and even lead to the occurrence of large-scale power outages in the system. In recent years, there have been accidents in many countries that evolved from successive interruptions to blackouts. One of the main reasons is the improper configuration of the third line of defense. Although the probability of these accidents is small, once it happ...

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Application Information

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IPC IPC(8): H02J4/00
Inventor 崔勇林震宇
Owner STATE GRID CORP OF CHINA
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