Analysis method of low-frequency oscillation node contribution factor based on wide field measuring information

Abstract

The invention belongs to the technical field of the on-line detection and analysis of electric power system low-frequency oscillation. The invention provides a method for quantitatively evaluating the contribution degree of an electric generating set associated with a node participating in the oscillation of certain mode to the oscillation power of the mode in a power system, only based on the information of Wide Area Measurement System. In the method, a concept of node contribution factor is first proposed based on injection active oscillatory power, and then according to the amplitude of injection active oscillatory power and the relative phase position among active oscillatory power curves under certain frequency mode, an analysis and calculation method is provided corresponding to the node contribution factor of the frequency mode, and the homology and grouping of the node are realized at the same time. The method is applicable to a system without an electromagnetic ring net and consideration for losses and can also be used for an actual electric power system which has the above characteristics through simplification.

Description

technical field [0001] The invention belongs to the technical field of on-line detection and analysis of low-frequency oscillations in electric power systems, and more specifically relates to on-line modal analysis of low-frequency oscillations in electric power systems using information from a wide-area measurement system. Background technique [0002] When low-frequency oscillation occurs in the power system, in order to understand and take measures to suppress the oscillation, operators need to know the modal information of the low-frequency oscillation in addition to the frequency, amplitude and damping ratio of the oscillation. The degree of participation of the unit associated with each node in the oscillation is one of the most important low-frequency oscillation modal information. For these modal information, the previous methods are obtained by solving the eigenvalues ​​and eigenvectors of the system state matrix through a small disturbance analysis program based on...

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Problems solved by technology

[0005] Aiming at the problem that the existing wide-area measurement system (WAMS) cannot use real-time data to quantitatively measure the degree of participation or contribution of the unit associated with the node in the low-frequency oscillation, the present invention provides a quantitatively based on the information of the wide-area measurement system It is an analysis method to measure the contribution degree of the generating units associated with the nodes participating in the oscillation of a certain mode to the oscillation power of the power grid

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