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Method for identifying negative damping low-frequency oscillation based on force moment decomposition method

A low-frequency oscillation and negative damping technology, 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

Active Publication Date: 2012-08-15
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
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  • Application Information

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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 negative damping low-frequency oscillation based on force moment decomposition method
  • Method for identifying negative damping low-frequency oscillation based on force moment decomposition method
  • Method for identifying negative damping low-frequency oscillation based on force moment 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 filed of electric systems, in particular relating to a realizing method of identifying negative damping low-frequency oscillation which is caused by a generator excitation control system, based on a force moment decomposition method. The realizing method comprises the following steps of: calculating subtranient electric potential E'q of a generator and determining velocity deviation delta omega of the generator, wherein the velocity deviation delta omega of the generator is calculated according to frequency of inner electric potential EQ of the generator; and judging whether damping provided by the excitation system of a machine group for a certain oscillation mode in an interconnected power grid is positive or negative by comparing phase relation of the subtranient electric potential delta E'q of the generator and the velocity deviation delta omega of the generator. The realizing method disclosed by the invention is convenient to measure, is accurate, can simply and clearly identify the generator excitation control system which provides the negative damping for a certain negative damping oscillation mode so as to quickly inhibit low-frequency oscillation. The method is a pioneering at home.

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...

Claims

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Application Information

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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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