Electromechanical transient modeling method and electromechanical transient model of direct-drive-type wind turbine generator system

Abstract

The invention relates to an electromechanical transient modeling method and an electromechanical transient model of a wind turbine generator system, in particular to an electromechanical transient modeling method and an electromechanical transient model of a direct-drive-type wind turbine generator system. The modeling method includes the following steps: firstly, a generator-side model of the wind turbine generator system is constructed. Secondly, a direct current and unloading circuit model of the wind turbine generator system is constructed. Thirdly, a grid-side converter and control system model of the wind turbine generator system is constructed. And lastly, a low voltage ride through control model of the wind turbine generator system is constructed. Based on a practical physical device, by means of a reasonable presume, an electromagnetic transient model of the direct-drive-type wind turbine generator system is simplified, and meanwhile, the dynamic process of direct current voltage and low voltage ride through characteristics of the converter are taken into account. The simulation result shows that the simulation curve of the model is consistent with practically detected low voltage ride through curve of the direct-drive-type wind turbine generator system, and the result is accurate and reliable. The electromechanical transient modeling method and the electromechanical transient model of the direct-drive-type wind turbine generator system are used for analyzing influence on transient stability of a power system when a large-size direct-drive-type wind power plant is introduced.

Description

technical field [0001] The invention relates to a modeling method and a transient state model of a wind power generating set, in particular to a direct-drive wind generating set electromechanical transient modeling method and an electromechanical transient model. Background technique [0002] The two most widely used types of fans are doubly-fed fans and direct-drive fans. Compared with doubly-fed fans, direct-drive fans not only have the advantages of being more adaptable to low wind speed, low noise, simple structure, high operating efficiency, and low follow-up maintenance costs, but also the motor-side converter of direct-drive fans can achieve maximum Power tracking control, the grid-side converter can control the DC voltage to be constant, the speed of the direct-drive fan generator has nothing to do with the grid-connected frequency, and the DC unloading circuit can effectively isolate the impact of grid faults on the generator side, so the direct The proportion of d...

AI Technical Summary

Problems solved by technology

The above models are all based on the electromagnetic transient model for modeling and simulation. When used for analysis and calculation of the impact of large-scale wind farm access systems, they are relatively complex, with slow calculation speed and poor numerical convergence.

Images