A sorting and grouping optimization method considering the coherence of the improved system under the connection of wind turbines

Abstract

The invention discloses a decoupling and grouping optimization method considering the coherence of the hoisting system under the connection of wind turbines. Aiming at the problem of complex and changeable system oscillation modes caused by large-scale wind turbine grid connection, a decoupling optimization control considering the connection of wind turbines is proposed Strategy, by selecting a specific location and investing in a fan capacity with appropriate power, it affects the power flow distribution of the system, changes the coherent relationship between nodes, and limits the decision-making range of splitting to a certain area to ensure that the units are not grouped under small disturbances and grouped under large disturbances The sections can be concentrated with a high probability, improving the control ability of the decoupling device. The present invention calculates the eigenvalues ​​and eigenvectors of the system state based on the slow coherence theory, forms a slow coherence correlation matrix, fully reflects the electrical connection of all nodes, and uses the improved intelligent optimization algorithm to build a double-layer programming model. Capacity distribution is used to improve unit coherence and reduce the scope of decision-making for splitting, which is of great significance for maintaining system security and stability.

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...

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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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