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Method of Identifying Negatively Damped Low-Frequency Oscillations Based on Integral Algorithm Based on Moment Decomposition

A low-frequency oscillation, negative damping technology, applied in the direction of reducing/preventing power oscillation, controlling generators through magnetic field changes, etc., can solve problems such as malfunction of the disturbance source positioning system

Active Publication Date: 2014-10-22
CHINA ELECTRIC POWER RES INST +1
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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 of Identifying Negatively Damped Low-Frequency Oscillations Based on Integral Algorithm Based on Moment Decomposition
  • Method of Identifying Negatively Damped Low-Frequency Oscillations Based on Integral Algorithm Based on Moment Decomposition
  • Method of Identifying Negatively Damped Low-Frequency Oscillations Based on Integral Algorithm Based on Moment Decomposition

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Embodiment Construction

[0042] In the following, the method for implementing the identification of the negative damping low-frequency oscillation problem caused by the generator excitation control system based on the torque decomposition according to the present invention will be further described in detail with reference to the accompanying drawings.

[0043] Such as figure 1 As shown, according to the Heffron-Philips model, the mathematical model of the synchronous generator can be obtained as follows:

[0044] ΔM e =ΔM e1 +ΔM e2 =K 1 Δδ+K 2 ΔE′ q (1)

[0045] Δ E q ′ = K 3 1 + T d 0 ′ K 3 s Δ E fd - K 3 K 4 1 + T d 0 ′ K 3 s Δδ - - - ( 2 )

[0046] ΔU t =K 5 Δδ+K 6 ΔE′ q (3)

[0047] Δδ = ω 0 T j s 2 ( Δ M m - Δ M e ) - - - ( 4 )

[0048] It can be seen from formula (1) that ΔM e A component of is propor...

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Abstract

The invention belongs to the field of power systems, in particular relates to a method for distinguishing negative damping low frequency oscillation caused by a power generator excitation control system on the basis of moment decomposition integral algorithm. The method comprises the steps of: calculating a power generator transient state potential bias deltaE'q and determining a power generator speed bias delta omega, wherein the power generator speed bias delta omega is obtained through calculation according to a frequency of a potential EQ in a power generator, and whether damp provided by an excitation system of the unit is positive or negative relative to some oscillation mode in an Internet power grid is judged through calculating an integral value of the power generator transient state potential bias deltaE'q and the power generator speed bias delta omega. The method is convenient for measurement and is accurate, and can simply and clearly distinguish which oscillation mode of some power generator excitation control system provides a positive damp or negative damp so that measures are rapidly taken for inhibiting low frequency oscillation.

Description

Technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for identifying a negatively damped low-frequency oscillation caused by a generator excitation system by an integral algorithm based on torque decomposition. 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 detection are the development trend of low-frequency oscillation suppression at home and abroad. At home and abroad, some attempts have been made to use the wide-area signal of the WAMS system to monitor low-frequency oscillations. Domestic systems with low-frequency oscillation online monitoring and early warning functions have also been developed. However, the research field of disturbance source positioning at home and abroad is in its infancy, and a complete and accurate positioning system from the fleet level to the unit ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02P9/14
Inventor 李文锋李莹周孝信刘增煌陶向宇王官宏何凤军赵红光
Owner CHINA ELECTRIC POWER RES INST
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