Dimension reduction modeling analysis method of doubly-fed wind generator

Abstract

The invention discloses a dimension reduction modeling analysis method of a doubly-fed wind generator. According to the dimension reduction modeling method, the influence of factors such as rotor current inner loop control, a phase-locked loop, power transmission line impedance and alternating-current weak power grid voltage is comprehensively considered, so that an established model can accurately analyzes the small signal stability of the doubly-fed wind generator under complex working conditions such as power grid voltage drop; a fast action time scale subsystem is simplified, the dimensionality reduction of the doubly-fed wind generator system model is realized, and the analysis difficulty of a doubly-fed wind generator state space model is greatly reduced; in the linearization processof a high-dimensional nonlinear model, non-state variables in a linearization model are removed step by step by flexibly applying the electrical relationship among variables, and finally a doubly-fedwind generator small signal state space model is established. Compared with a 12-dimensional model, the built model has the advantages that the dimensionality of the model is reduced by 1 / 3, and therefore, the simplicity and convenience of stability analysis and design of a doubly-fed wind generator grid-connected system are effectively improved.

Description

technical field [0001] The invention belongs to the modeling field of double-fed wind power generators, and specifically proposes a dimension reduction modeling analysis method of double-fed wind power generators. Background technique [0002] Since the beginning of the 21st century, with the traditional fossil energy crisis and the resulting environmental pollution on the brink and frequent occurrence, the development and utilization of new energy has become the only way to maintain the sustainable development of human society. Among them, wind power generation, after nearly two decades of practical testing, has become recognized as the most promising form of new energy for commercial development. As the largest consumer and producer of wind power installed capacity in the world, China has good wind energy resource conditions, vast and sufficient land resource conditions, a relatively mature wind power industry foundation, a widely distributed and technologically advanced p...

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Problems solved by technology

However, the existing models generally have the problem that the dimension is too high and it is not easy to be practically applied.

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