Research method for analyzing subsynchronous oscillation characteristics of direct-drive fan based on admittance

A sub-synchronous oscillation and wind turbine technology, applied in wind power generation, AC network circuits, electrical components, etc., can solve problems such as unsuitable wind turbine parallel operation model

Inactive Publication Date: 2019-08-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, the impedance analysis method generally establishes the impedance model of a single or multiple flexible AC transmission system (FACTS) equipment in series, which is not suitable for the model of multiple FACTS equipment or multiple wind turbines running in parallel.

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  • Research method for analyzing subsynchronous oscillation characteristics of direct-drive fan based on admittance
  • Research method for analyzing subsynchronous oscillation characteristics of direct-drive fan based on admittance
  • Research method for analyzing subsynchronous oscillation characteristics of direct-drive fan based on admittance

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[0091] In order to make the objectives, advantages and technical solutions of the present invention more clear, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0092] Such as figure 1 As shown, a research method based on the ...

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Abstract

The invention discloses a research method for analyzing subsynchronous oscillation characteristics of a direct-drive fan based on admittance. A direct-drive fan network side converter mainly comprisesa current controller, an outer ring voltage controller and a phase-locked loop controller. The method comprises the following steps of: the step 1, establishing an admittance model of a current controller; the step 2: on the basis of the step 1, establishing an outer loop voltage controller model, and correcting an admittance model; the step 3: based on the steps 1 and 2, establishing a phase-locked loop controller model to obtain a final direct-drive fan admittance model; the step 4: based on the step 3, evaluating the risk of the direct-drive fan generating sub-synchronous oscillation by utilizing the dissipative property of the admittance matrix; the step 5: establishing a power grid side input impedance matrix; and the step 6: based on the steps 3 and 5, predicting the grid connectionstability of the direct-drive fan by utilizing the stability criterion of the impedance matrix infinite-norm.

Description

technical field [0001] The invention relates to the technical field of power system power generation and transmission, in particular to the study of the subsynchronous oscillation phenomenon of a direct-drive fan based on an admittance analysis method. Background technique [0002] National power companies have increasingly high requirements for the reliability of wind power generation. In recent years, with the large-scale access of clean energy represented by wind energy, the sub / sub-synchronous oscillation (SSO) problem caused by it has seriously threatened the safe and stable operation of the power system. In recent years, such incidents have been frequently reported at home and abroad. In 2009, a wind farm in Texas reported for the first time that the interaction between wind power and transmission network caused subsynchronous oscillation. Since 2011, similar subsynchronous resonances have occurred many times in the Guyuan region of North China. On July 1, 2015, a la...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386H02J2203/20Y02E10/76
Inventor 徐衍会滕先浩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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