Equivalent calculation method for large-scale wind power plant of parallel structure

Abstract

The invention belongs to the technical field of wind power plant analysis and calculation, and particularly relates to an equivalent calculation method for a large-scale wind power plant of a parallelstructure. The method comprises the steps: establishing a wind power plant linearized state space model for the wind power plant of the parallel structure formed by M wind power generators; performing equivalent transformation on the state variables of the wind power plant, and similarly transforming a linearized state space matrix of the wind power plant into a block diagonal matrix; decouplingthe linearized state space model of the wind power plant in a manner: M-1 subsystems is formed by connecting a wind driven generator to an infinite bus via a line, and the M-th subsystem is formed byconnecting a wind driven generator into an external power system through a correction network; according to the linearization model of the M-th subsystem, reversely deducing a nonlinear model of the M-th subsystem to obtain a single-machine equivalent model of the wind power plant; dividing the M-th subsystem into two interconnection systems, namely a wind power plant part and an external power part, and solving the interface state variables of the interconnection systems and the dynamic process of the wind power plant.

Description

technical field [0001] The invention belongs to the technical field of analysis and calculation of wind farms, and in particular relates to an equivalent calculation method for large-scale wind farms with a parallel structure. Background technique [0002] In recent years, my country's wind power industry has developed rapidly, and the installed capacity of wind power ranks first in the world. With the expansion of the scale of wind farms, a large wind farm may contain hundreds or even thousands of wind turbines. Using a detailed model to conduct model analysis and simulation analysis on the small disturbance stability of the wind farm itself and the grid-connected system of the wind farm requires a lot of calculations, and even "curse of dimensionality" may occur. Therefore, when analyzing the small-disturbance stability of wind farms, a single-machine or multi-machine equivalent model is often used, and one or several equivalent wind turbines represent the entire wind far...

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Problems solved by technology

Therefore, its applicability in the study of the dynamics and stability of wind farm grid-connected systems also needs to be improved.

In addition, neither the single-machine equivalent method nor the multi-machine equivalent method can reflect the influence of the scale of the wind farm and the power network parameters in the wind farm on the small-disturbance stability of the wind farm, and it is difficult to provide comprehensive information for wind farm planning from the perspective of small-disturbance stability. Guiding suggestions

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