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Model-reduced-order feedback control method for subsynchronous oscillation suppression of direct-drive wind turbines

A subsynchronous oscillation and model reduction technology, applied in the direction of reducing/preventing power oscillation, AC network circuits, electrical components, etc., can solve problems such as controller design and verification difficulties, and achieve a good subsynchronous oscillation suppression effect

Active Publication Date: 2021-11-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

This brings great difficulties to controller design and verification

Method used

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  • Model-reduced-order feedback control method for subsynchronous oscillation suppression of direct-drive wind turbines
  • Model-reduced-order feedback control method for subsynchronous oscillation suppression of direct-drive wind turbines
  • Model-reduced-order feedback control method for subsynchronous oscillation suppression of direct-drive wind turbines

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Embodiment Construction

[0117] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0118] 1. Establishment of linearization model of direct drive fan

[0119] Such as figure 1 The shown direct-drive wind power generating set includes a wind turbine 1, a permanent magnet synchronous motor 2, a rotor-side converter 3, a grid-side converter 4, a grid-side converter controller, a filter circuit 5, and the like.

[0120] Since the wind turbine 1, the permanent magnet synchronous motor 2 and the rotor-side converter 3 are isolated from the AC grid 6, they have little effect on the subsynchronous oscillation, so a DC current source is used to replace these parts. The simplified circuit diagram of the direct drive fan is as follows figure 2 shown. Among them, the current magnitude of the DC current source I dc Represents the fan output level, in addition to the DC capacitor C d , the DC voltage is U dc , the output voltage U of the AC side of...

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Abstract

The invention relates to a model-reduced-order feedback control method for subsynchronous oscillation suppression of a direct-drive fan, including 1. linearizing the mathematical model of the direct-drive fan and its controller, and establishing a small-signal model of the direct-drive fan including all state variables . 2. According to the eigenvalues ​​of the complete small-signal model, the observability of the state variables, and the degree of influence on the oscillation, the small-signal model is reduced to establish a reduced-order model of the direct-drive fan. 3. Using the reduced-order direct-drive fan small-signal model, design a feedback controller. The present invention obtains the small-signal model of the direct-drive fan including all state variables through the linearization of the mathematical model of the direct-drive fan and its controller for analysis and calculation; reduces the order of the small-signal model to obtain the reduced-order of the direct-drive fan The model provides convenience for the design of the feedback controller; using the reduced-order small-signal model of the direct-drive fan, the feedback controller is designed, which achieves a good subsynchronous oscillation suppression effect of the direct-drive fan.

Description

technical field [0001] The invention relates to a control method applied to the suppression of subsynchronous oscillation of a direct-drive fan, in particular to a feedback control method based on a reduced-order model applied to the analysis of subsynchronous oscillation. Background technique [0002] In recent years, wind power has developed rapidly and has become an important part of green new energy. The phenomenon of active power oscillation whose oscillation frequency is much greater than 2Hz and less than 50Hz in the power system is called subsynchronous oscillation, which is one of the important research topics of the power system. With the increase of installed capacity of wind power generation, the subsynchronous oscillation problem of wind power generation has gradually attracted attention. In 2011, a wind farm located in North China experienced multiple synchronous oscillations, and its oscillation frequency varied within a wide range. In 2015, a large wind far...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/381H02J2203/20H02J2300/28
Inventor 张鹏韩晨阳李星原
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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