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Model order reduction feedback control method for direct-drive fan subsynchronous oscillation suppression

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

Active Publication Date: 2020-12-01
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 order reduction feedback control method for direct-drive fan subsynchronous oscillation suppression
  • Model order reduction feedback control method for direct-drive fan subsynchronous oscillation suppression
  • Model order reduction feedback control method for direct-drive fan subsynchronous oscillation suppression

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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 power grid 6, they have little effect on the subsynchronous oscillation. Therefore, 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 ...

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Abstract

The invention relates to a model order reduction feedback control method for direct-driven fan subsynchronous oscillation suppression. The method comprises the following steps: 1, linearizing mathematical models of a direct-driven fan and a controller of the direct-driven fan, and establishing a direct-driven fan small signal model containing all state variables; 2, performing order reduction on the small signal model according to the characteristic value of the complete small signal model, the observability of the state variable and the influence degree on oscillation, and establishing an order reduction model of the direct-driven fan; and 3, designing a feedback controller by utilizing the reduced-order small-signal model of the direct-driven fan. According to the invention, through linearization of mathematical models of the direct-drive fan and the controller thereof, a small signal model of the direct-drive fan containing all state variables is obtained for analysis and calculation. Order reduction is carried out on the small signal model to obtain an order reduction model of the direct drive fan, and convenience is provided for design of a feedback controller. A feedback controller is designed by using a reduced-order direct-drive fan small-signal model, and a good direct-drive fan subsynchronous oscillation suppression effect is achieved.

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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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/381H02J2203/20H02J2300/28
Inventor 李星原张鹏韩晨阳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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