Low-frequency oscillation type judgment method and device based on multi-source data fusion

A low-frequency oscillation and data technology, which is applied to measuring devices, circuit devices, and detecting faults according to conductor types, can solve problems such as the inability to quickly determine the type of low-frequency oscillation, and achieve the effect of narrowing the scope of influence

Pending Publication Date: 2021-10-01
JIANGSU ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology only obtains a single PMU measured data from the WAMS system, and fails to comprehensively consider the change of the grid operation mode caused by the switch displacement and the grid damping analysis conclusion given by DSA, so it cannot quickly judge the oscillation type of the low-frequency oscillation and distinguish the forced oscillation or weakly damped oscillation

Method used

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  • Low-frequency oscillation type judgment method and device based on multi-source data fusion

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Experimental program
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Embodiment 1

[0048] This embodiment introduces a method for judging the type of low-frequency oscillation, including:

[0049] Obtain the analysis results of small disturbances and dynamic stability analysis results of expected faults at each section of the power grid;

[0050] Obtain the low-frequency oscillation monitoring information of the power grid to determine whether a low-frequency oscillation event occurs;

[0051] In response to a low frequency oscillation event occurring on the power grid, the following operations are performed:

[0052] Analyzing and obtaining low-frequency oscillation mode data according to the low-frequency oscillation monitoring information;

[0053] Obtain the information on the displacement of the grid switch within the set period before the occurrence of the low-frequency oscillation event;

[0054] Based on the grid switch displacement information and low-frequency oscillation mode data, determine whether there is a switch displacement related to the cu...

Embodiment 1-1

[0058] On the basis of embodiment 1, refer to figure 1 , this embodiment specifically introduces the steps of a method for judging the type of low-frequency oscillation, including the following contents.

[0059] 1. Obtain small disturbance analysis results and expected fault dynamic stability analysis results at each section of the power grid from the DSA system; obtain power grid low-frequency oscillation monitoring information from the WAMS system to determine whether low-frequency oscillation events occur.

[0060] 2. According to the low-frequency oscillation monitoring information of the power grid, when it is determined that a low-frequency oscillation event occurs, the following operations are performed in response to the occurrence of a low-frequency oscillation event in the power grid:

[0061] 3.1. According to the analysis of low-frequency oscillation monitoring information, the current low-frequency oscillation mode data is obtained; the low-frequency oscillation ...

Embodiment 2

[0078] Based on the same inventive concept as Embodiment 1, this embodiment introduces a low-frequency oscillation type judging device, which includes:

[0079] The data acquisition module is configured to acquire the analysis results of small disturbances at each section of the power grid, the results of dynamic stability analysis of expected faults, and the monitoring information of low-frequency oscillation of the power grid;

[0080] And, the low-frequency oscillation type judging module is configured to perform the following operations in response to the occurrence of the low-frequency oscillation event on the power grid when it is determined that the low-frequency oscillation event occurs according to the low-frequency oscillation monitoring information of the power grid:

[0081] Analyzing and obtaining low-frequency oscillation mode data according to the low-frequency oscillation monitoring information;

[0082] Obtain the information on the displacement of the grid sw...

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Abstract

The invention discloses a low-frequency oscillation type judgment method and device, and belongs to the technical field of power grid low-frequency oscillation recognition and control. The method comprises the steps: obtaining a small interference analysis result and an anticipated fault dynamic stability analysis result of each section moment of a power grid; when a low-frequency oscillation event occurs in the power grid, analyzing to obtain low-frequency oscillation mode data, and obtaining power grid switch displacement information related to the event within a set time period before the low-frequency oscillation event occurs; and if no related switch displacement exists, matching the low-frequency oscillation mode data with the small interference analysis result, otherwise, matching the low-frequency oscillation mode data with the equipment anticipated fault dynamic stability analysis result corresponding to the related switch displacement, and if the matching is unsuccessful, determining that the oscillation type is forced oscillation, otherwise, determining that the oscillation type is weak damping oscillation. According to the invention, the oscillation type can be quickly and accurately judged when the low-frequency oscillation occurs in the power grid, so that dispatching operation personnel are helped to take timely and effective countermeasures, and the influence range of low-frequency oscillation events is narrowed.

Description

technical field [0001] The invention relates to the technical field of power grid low-frequency oscillation identification and control, in particular to a low-frequency oscillation type judgment method and device based on multi-source data fusion. Background technique [0002] With the rapid development of the power system, various low-frequency oscillation events occur frequently in the power grid. Forced oscillation and weakly damped low-frequency oscillation are common types of low-frequency oscillation in power grids. Weakly damped low-frequency oscillations are caused by insufficient system damping, which needs to be suppressed by increasing the damping level of the system, such as reducing the power of the tie line, modulating the DC power, and increasing the voltage level of the receiving end grid. Forced oscillations are induced by periodic power disturbances and need to be suppressed by locating the source of the vibration and removing it. Therefore, correctly dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G01R31/08H02J13/00
CPCH02J3/00H02J3/002G01R31/088G01R31/086H02J13/00002H02J13/00001H02J2203/10
Inventor 张琦兵陈颖杰霍雪松徐伟王黎明周海锋苏大威孙泽伦邹德龙
Owner JIANGSU ELECTRIC POWER CO
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