Wind power plant equivalent modeling method based on single-machine equivalence and selection modal analysis

Abstract

The invention discloses a wind power plant equivalent modeling method based on single-machine equivalence and selection modal analysis. The wind power plant equivalent modeling method comprises the following steps: performing single-machine equivalent aggregation on more than one doubly-fed fan in a wind power plant to form a doubly-fed fan; modeling the dynamic mathematical model of the doubly-fed fan of the wind power plant to obtain a full-order mathematical model; enabling the full-order mathematical model to be equivalent to an aggregation model; and performing order reduction on the equivalent doubly-fed fan by selecting an order reduction method of modal analysis, thus solving the problems that in the prior art, a dynamic equivalence method for a wind power plant has some limitations in stability research of a fan grid-connected system, and it cannot be guaranteed that the physical meaning of variables is not changed, and the calculation efficiency is low because only the single-machine equivalent aggregation method is used and the system order is possibly too high, and the like.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a wind farm equivalent modeling method based on single machine equivalent and selection mode analysis. Background technique [0002] Due to the increasing energy shortage and environmental pollution caused by the steady growth of global energy consumption in recent decades, new energy power generation, especially wind power generation, has received more and more attention and played an increasingly important role in the power system. . Due to the randomness of wind energy and the uncertainty of connecting to the grid, the research on the stability of wind turbines connected to the grid has gradually become a focus. In order to study the dynamic characteristics of wind farms connected to the grid, it is of great significance to model wind farms reasonably. The dynamic equivalence method of wind farms is mainly divided into two types according to whether to reta...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a wind farm equivalent modeling method based on stand-alone equivalent and selective modal analysis to solve the dynamic equivalent method of wind farms. For the stability research of wind turbine grid-connected systems, It has some limitations, and there is no guarantee that the physical meaning of the variable will not change; only using the single-machine equivalent aggregation method may still have technical problems such as the system order is too high, resulting in low computational efficiency

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