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DFIG subsynchronous oscillation suppression method based on double-second-order generalized integrator

A technology of subsynchronous oscillation and generalized integrator, applied in reducing/preventing power oscillation, AC network to reduce harmonic/ripple, single network parallel feeding arrangement, etc., can solve subsynchronous oscillation, affect power grid stability, etc. question

Inactive Publication Date: 2021-01-01
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +2
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that adding series compensation capacitors to the existing long-distance power transmission lines to improve the power quality will induce subsynchronous oscillations in the DFIG units of the wind farm and affect the stability of the power grid. DFIG Subsynchronous Oscillation Suppression Method of Integrator

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  • DFIG subsynchronous oscillation suppression method based on double-second-order generalized integrator
  • DFIG subsynchronous oscillation suppression method based on double-second-order generalized integrator
  • DFIG subsynchronous oscillation suppression method based on double-second-order generalized integrator

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Embodiment Construction

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of 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.

[0059] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0060] see image 3 Describe this embodiment, the DFIG subsynchronous oscillation suppression method based on the biquad generalized integrator described in this embodiment, the suppression method includes the following process:

[0061] First, in the process of controlling the rotor converter, ...

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Abstract

The invention discloses a DFIG subsynchronous oscillation suppression method based on a double-second-order generalized integrator, and belongs to the field of doubly-fed wind generator subsynchronousoscillation suppression. The problem that the stability of a power grid is affected due to the fact that subsynchronous oscillation of a DFIG unit of a wind power plant is induced when a series compensation capacitor is added into an existing long-distance power transmission line to improve the electric energy quality is solved. In the control process of the rotor converter, the subsynchronous harmonic component in the stator output voltage Vabc in the process of obtaining the phase theta1 by using the phase-locked loop is filtered by using the phase-locked loop realized by the second-order generalized integrator; a stator current sub-synchronous component suppression ring realized by a quasi-resonance controller is used for generating an estimated value of a sub-synchronous harmonic component in the DFIG rotor side rotor input voltage to counteract the harmonic component in a DFIG rotor side rotor input voltage instruction. The method is mainly used for suppressing the subsynchronousoscillation of the wind power generation system realized by the DFIG.

Description

technical field [0001] The invention belongs to the field of suppressing subsynchronous oscillation of a doubly-fed wind power generator (DFIG). Background technique [0002] The grid-connected penetration rate of new energy power generation has gradually increased, and the grid-connected capacity of wind power has continued to expand. How to improve the grid-connected stability of wind farms and how to improve the stability of the grid are the main issues of the future smart grid. [0003] Usually, wind farms are built in remote areas. Therefore, after the wind energy is converted through electromechanical, a long-distance electric energy transmission is required to output new energy power to the load. In modern power grids, series compensation capacitors are often used in the lines to reduce the influence of inductance effects, thereby improving the power factor of transmission lines. The method of series compensating capacitors tends to cause low-frequency oscillation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/01H02J3/38
CPCH02J3/24H02J3/01H02J3/381H02J2203/20H02J2300/28Y02E10/76Y02E40/40
Inventor 祖光鑫武国良李国强田伟王恩双张星孙东阳
Owner STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST
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