Method for Identifying Negatively Damped Low-Frequency Oscillations Based on Torque Decomposition Method

A technology of low-frequency oscillation and decomposition method, applied in the direction of reducing/preventing power oscillation, frequency measurement device, fault location, etc., can solve problems such as disturbance source location system misoperation, and achieve the goal of improving damping level, suppressing oscillation, and suppressing low-frequency oscillation Effect

Active Publication Date: 2016-01-20
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
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Problems solved by technology

Since the power system is a dynamically balanced system, it is also difficult to distinguish the normal power fluctuation and avoid the malfunction of the disturbance source location system

Method used

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  • Method for Identifying Negatively Damped Low-Frequency Oscillations Based on Torque Decomposition Method
  • Method for Identifying Negatively Damped Low-Frequency Oscillations Based on Torque Decomposition Method
  • Method for Identifying Negatively Damped Low-Frequency Oscillations Based on Torque Decomposition Method

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Embodiment Construction

[0039] The implementation method of the invention based on torque decomposition to identify the problem of negative damping low-frequency oscillation caused by the generator excitation control system will be further described in detail below in conjunction with the accompanying drawings.

[0040] Such as figure 1 As shown, according to the Heffron-Philips model, the mathematical model of the synchronous generator can be obtained as follows:

[0041] ΔM e =ΔM e1 +ΔM e2 =K 1 Δδ+K 2 ΔE' q (9)

[0042] Δ E q ′ = K 3 1 + T d 0 ′ K 3 s Δ E fd - K ...

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Abstract

The invention belongs to the field of electric power systems, and in particular relates to a realization method for identifying the problem of negative damping low-frequency oscillation caused by a generator excitation control system based on a torque decomposition method. The implementation method includes the calculation of the generator subtransient potential E'q and the determination of the generator speed deviation Δω, wherein the generator speed deviation Δω is calculated and obtained according to the frequency of the generator internal potential EQ, and by comparing the generator subtransient potential ΔE ′q and the phase relationship of the generator speed deviation Δω, it can be judged whether the excitation system of the unit provides positive or negative damping for a certain oscillation mode in the interconnected grid. This method is easy to measure and accurate, and can simply and clearly identify the generator excitation control system that provides negative damping for a certain negative damping oscillation mode, so as to quickly suppress low-frequency oscillations, which is the first in China.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for identifying negative-damped low-frequency oscillations caused by a generator excitation system based on a torque decomposition method. Background technique [0002] The problem of negatively damped low-frequency oscillation is a technical problem faced by power grids at home and abroad. Active control and instant identification are the development trend of low-frequency oscillation suppression at home and abroad. At home and abroad, some attempts have been made to monitor low-frequency oscillations using the wide-area signal of the WAMS system. China has also developed an online monitoring and early warning system for low-frequency oscillations, but the field of disturbance source location research is still in its infancy at home and abroad, and no complete and accurate positioning system has been realized from the fleet level to the unit control system leve...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R23/02
CPCH02J3/24
Inventor 李莹李文锋陈磊陶向宇王官宏刘增煌何凤军濮钧赵红光
Owner CHINA ELECTRIC POWER RES INST
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