Disconnecting and grouping optimization method for improving consistency of system under fan access

Abstract

The invention discloses a disconnecting and grouping optimization method for improving consistency of a system under fan access. According to the invention, based on the problem of complex and changeable system oscillation mode caused by large-scale fan grid connection, a disconnecting and grouping optimization control strategy considering fan access is provided; by selecting a specific place, inputting a fan capacity with proper power, influencing system power flow distribution situation and changing the consistency relation between nodes, a disconnecting decision range is limited in a certain area, so that it is ensured that a unit is not grouped under small disturbance, the grouping section can be centralized at a large probability under large disturbance, and the control capacity of splitting disconnecting device is improved; based on a slow consistency theory calculation system state characteristic value and a characteristic vector, a slow consistency correlation matrix is formed,so that electrical connection of all nodes is comprehensively reflected; and a double-layer planning model is built through an improved intelligent optimization algorithm, and the consistency of theunit is improved by planning fan access points and access capacity distribution, so that the purpose of narrowing the disconnecting decision range is achieved, and the method has important significance in maintaining safety and stability of the system.

Description

technical field [0001] The invention relates to the technical field of synchronous adjustment and analysis of electric power systems, in particular to a method for splitting and grouping optimization considering the coherence of the lifting system under the connection of wind turbines. Background technique [0002] In recent years, in response to the need to promote the energy transformation strategy, new energy power generation technologies represented by wind power and photovoltaics have received more and more attention. In the development process of many new energy industries, wind power has become the mainstay of the global energy industry due to its mature technology, zero pollution to the environment, and wide application range. While large-scale wind power grid integration brings green energy, it also causes many problems such as new voltage and frequency transient stability. As the last line of defense, decoupling is of great significance when out-of-step oscillation...

AI Technical Summary

Problems solved by technology

Some studies have further considered the equivalent of the wind turbine access as the system contraction admittance matrix to analyze the impact on the splitting, and proposed an online coherent identification strategy, but the problem of non-convergence of the splitting strategy under multiple faults in the large power grid has not yet been solved.

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