Method and system for identifying negative weak damping unit of power system

A technology of power system and identification method, which is applied in the field of identification method and system of negative and weakly damped units in power system, and can solve problems such as ultra-low frequency oscillation

Pending Publication Date: 2022-04-08
国家电网有限公司西南分部
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Problems solved by technology

When the power grid is dominated by hydropower, the negative damping effect will dominate, and it is easier to cause ultra-low frequency oscillations. Therefore, there is an urgent need for a method for identifying negative and weakly damped units in the power system under the condition of high proportion of hydropower.

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  • Method and system for identifying negative weak damping unit of power system
  • Method and system for identifying negative weak damping unit of power system
  • Method and system for identifying negative weak damping unit of power system

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Embodiment Construction

[0055] Specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0056] The invention provides a method and system for identifying negative and weakly damped units in a power system;

[0057] Such as figure 1 As shown, on the one hand, a method for identifying negative and weakly damped units in a power system includes the following steps:

[0058] S1. Collect abnormal data of units in the power system and perform preprocessing to obtain oscillation signals of each generator;

[0059] Preferab...

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Abstract

The invention discloses a negative weak damping unit identification method and system for a power system, and the method comprises the steps: collecting abnormal data of a unit in the power system, carrying out the preprocessing, obtaining an oscillation signal of each generator, carrying out the mode decomposition, obtaining a discrete time sequence parameter of each oscillation signal, and carrying out the recognition of the unit; according to the method, a damping torque analysis method is utilized to obtain a damping torque coefficient of each generator in each oscillation mode according to discrete time sequence parameters of each oscillation signal, and the negative and weak damping unit of the power system is identified in combination with the damping torque coefficients. Under the condition of low-frequency oscillation or ultralow-frequency oscillation, a unit causing oscillation is found by identifying negative damping or weak damping in a power system, so that an ultralow-frequency oscillation strategy is effectively formulated.

Description

technical field [0001] The invention relates to the field of identification of negative and weak damping units in a power system with a high proportion of hydropower, in particular to a method and system for identifying negative and weak damping units in a power system. Background technique [0002] At present, the high proportion of hydropower has become the main feature of Southwest Power Grid. In recent years, the phenomenon of ultra-low frequency oscillation caused by hydropower in Southwest Power Grid has become more and more frequent, which greatly increases the risk of system disconnection. In order to ensure the safe and stable operation of the power grid, it is necessary to quickly suppress the ultra-low frequency oscillation after it appears, and the accurate identification of the negative damping unit is the prerequisite for formulating an effective suppression strategy for the ultra-low frequency oscillation. [0003] The analysis of previous oscillation acciden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
Inventor 余锐何飞汤凡张宇栋蒋航刘佳钰刘柏私
Owner 国家电网有限公司西南分部
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