Method for constructing wind power plant frequency domain equivalent model

Abstract

The invention provides a method for constructing a wind power plant frequency domain equivalent model. The wind speed at a certain point in a wind power plant space is used as an input quantity, the total active power of a wind power plant is used as an output quantity, the overall frequency domain equivalent model of the wind power plant is built, the model is divided into a positive wind speed channel and a negative wind speed channel, the positive wind speed channel represents and meters the energy transformational relation of the wind power plant after time-lag, wake flow, a tower shadow, wind shear and other space influence factors, and the negative wind speed channel represents the total cut-down function of each wind power generation set pitch angle controller in the wind power plant on excess wind power. The method avoids the difficulty of accurately building the models of the time-slag, the wake flow, the tower shadow, the wind shear and other space influence factors of the wind power plant in a time domain, and the influence of various space influence factors and the wind power generation set pitch angle controllers on the wind power plant energy transformation function is accurately metered in the equivalent model obtained through measured data in a frequency spectrum mode.

Description

technical field [0001] The invention relates to the field of power system modeling, in particular to an equivalent modeling method for wind farms that can take into account various spatial influencing factors. Background technique [0002] Due to the intermittent and random nature of wind energy, the centralized access of large-scale wind power has brought various safety and stability and operation control issues to the power system, mainly including scheduling, peak regulation and backup, power quality, transient and dynamic stability, etc. In this series of problems, except for the transient stability problem where the wind speed change is not considered due to the short observation time, the rest of the problems need to take into account the fluctuation of wind power. The generation of wind power is the result of the joint action of wind and wind farms, and the fluctuation characteristics of wind power are determined by the two. Therefore, to obtain accurate wind farm po...

AI Technical Summary

Problems solved by technology

Due to the complexity of the environment and spatial distribution of wind farms, the spatial relationship between each wind turbine and its surrounding turbines requires a large number of parameters to describe. It is very difficult to establish a detailed model that accurately describes the wind propagation inside the wind farm.

Therefore, there is still a lack of simple and accurate methods to calculate the power fluctuations of the entire wind farm based on the change curve of the "first wind speed" of the wind farm.

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