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Power system low-frequency oscillation monitoring method adopting improved Prony algorithm

A low-frequency oscillation and power system technology, applied in the direction of reducing/preventing power oscillation, electrical components, circuit devices, etc., can solve problems such as poor monitoring accuracy, and achieve the effect of eliminating adverse effects

Pending Publication Date: 2022-04-19
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor monitoring accuracy when using commonly used signal analysis methods to analyze and control low-frequency oscillations, and propose a method for monitoring low-frequency oscillations in power systems using improved Prony algorithms

Method used

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  • Power system low-frequency oscillation monitoring method adopting improved Prony algorithm
  • Power system low-frequency oscillation monitoring method adopting improved Prony algorithm
  • Power system low-frequency oscillation monitoring method adopting improved Prony algorithm

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specific Embodiment approach 1

[0016] Specific implementation mode one: combine Figure 1 to Figure 5 To illustrate this embodiment, a method for monitoring low-frequency oscillation of a power system using an improved Prony algorithm described in this embodiment includes the following steps:

[0017] Step 1. Analyze the mechanism of low-frequency oscillation in the power system, and determine the relationship between low-frequency oscillation and damping in the power system;

[0018] Step 2, based on the relationship between low-frequency oscillation and damping in the power system obtained in step 1, establish a Prony algorithm mathematical model;

[0019] Step 3, improve the Prony algorithm mathematical model established in step 2, and use the improved Prony algorithm mathematical model to calculate each characteristic quantity of the low-frequency oscillation;

[0020] Step 4: Applying the characteristic quantities of the low-frequency oscillation calculated in step 3 to actual operation to complete th...

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Abstract

The invention discloses a power system low-frequency oscillation monitoring method adopting an improved Prony algorithm, relates to a power system low-frequency oscillation monitoring technology, and aims to solve the problem of poor monitoring precision when low-frequency oscillation is analyzed and controlled by using a common signal analysis method. According to the method, a low-frequency oscillation mechanism in the power system is analyzed, and the relation between low-frequency oscillation and damping in the power system is determined; establishing a Prony algorithm mathematical model based on the relationship between low-frequency oscillation and damping in the power system; the established Prony algorithm mathematical model is improved, and the improved Prony algorithm mathematical model is utilized to calculate each characteristic quantity of low-frequency oscillation; and applying each calculated characteristic quantity of the low-frequency oscillation to actual operation to complete monitoring of the low-frequency oscillation of the power system. The beneficial effect is that the monitoring precision is high.

Description

technical field [0001] The invention relates to a low-frequency oscillation monitoring technology of a power system. Background technique [0002] During the transient process of small disturbances in the power system, the phenomenon that the rotor of the generator occasionally swings back and forth relative to the synchronous magnetic field, and the oscillation frequency is relatively low, generally between 0.1-2.5Hz, is called low-frequency oscillation, also known as It is power oscillation; if the oscillation process exhibits damping, the oscillation amplitude will gradually weaken as time goes by, and finally restore stability; if in some specific circuit combinations, the motor, excitation winding and machinery in the system The positive damping of the aspect cannot offset the negative damping produced by the system, so that the system generally presents the characteristics of low damping or negative damping, and the oscillation will continue or even gradually intensify...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/00
CPCH02J3/241H02J3/00H02J2203/20
Inventor 刘智洋宋杭选刘进郑君陆杭雷雪婷
Owner STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST
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