Method for extracting frequency dynamic spatial and temporal distribution characteristic information of power system

Abstract

The invention discloses a method for extracting frequency dynamic spatial and temporal distribution characteristic information of a power system. The method comprises the following steps: decomposing power grid frequency dynamic data measured by a power system wide area measurement system by utilizing a complex empirical orthogonal function analysis method, extracting standing wave components and traveling wave components in the frequency dynamic change process, calculating the transmission speed of frequency dynamics in the power grid, thereby obtaining related information characterizing frequency dynamic spatial and temporal distribution characteristics of the power system. The method disclosed by the invention is applied to the actual power grid, the dynamic change characteristics of the disturbed power grid frequency are analyzed, the traveling wave component and the standing wave component in the power grid frequency dynamics process can be effectively extracted, the transmission characteristic of disturbance in the power grid can be analyzed on line by performing real-time analysis on measured data of the power system wide area measurement system, valid decision information is provided for scheduling personnel, and the method has an excellent practical value and application prospect.

Description

technical field [0001] The invention belongs to the field of electric power system frequency stability, in particular to a method for extracting information related to the dynamic time-space distribution characteristics of electric power system frequency. Background technique [0002] The interconnection between regional power grids makes the power system form a large-scale power grid with large spatial span, strong transmission capacity and complementarity. Large-scale interconnected power grids can take advantage of power complementarity between power grids and improve the anti-interference ability of power grids to a certain extent. However, as the complexity of the grid structure increases, the uncertainty of the system also increases. When a large-scale power grid suffers from large disturbances, the balance between the generation and consumption of active power in the system is out of balance, and the energy carried by the unbalanced power is unevenly distributed in t...

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Problems solved by technology

[0004] Relevant scholars at home and abroad have made some progress in the study of frequency dynamic characteristics, but the current research on the mechanism of power grid frequency dynamic temporal and spatial distribution characteristics still needs further exploration.

The proposal of the electromechanical wave theory provides a new method for understanding the electromechanical dynamics of the power system, and interprets the basic characteristics and influencing factors of the disturbance energy in the power grid in an analytical form. Certain assumptions are made, such as assuming the consistency, uniformity and continuity of the grid structure parameters, so there may be certain errors in the analysis results using the continuous model

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