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Converter control-based doubly-fed induction generator sub-synchronous oscillation suppression method and system

A sub-synchronous oscillation and doubly-fed fan technology, which is applied in the direction of reducing flicker of the AC network, reducing/preventing power oscillation, wind power generation, etc., can solve problems such as the inability to effectively suppress sub-synchronous oscillation, and achieve improved user satisfaction and performance , the effect of suppressing subsynchronous oscillation

Active Publication Date: 2019-10-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a method and system for suppressing subsynchronous oscillation of doubly-fed wind turbines based on converter control, so as to solve the problem that the prior art cannot effectively suppress subsynchronous oscillation

Method used

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  • Converter control-based doubly-fed induction generator sub-synchronous oscillation suppression method and system
  • Converter control-based doubly-fed induction generator sub-synchronous oscillation suppression method and system
  • Converter control-based doubly-fed induction generator sub-synchronous oscillation suppression method and system

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Embodiment 1

[0090] A specific embodiment of the present invention discloses a doubly-fed wind power subsynchronous oscillation suppression method based on converter control, such as figure 1 shown, including the following steps:

[0091] S1. When sub-synchronous oscillation occurs in the DFIG grid-connected system, collect the operating data of the DFIG-connected system;

[0092] S2. According to the response process of the grid-connected system of double-fed wind turbines under grid disturbance and the subsynchronous oscillation divergence mechanism of double-fed wind turbines, the mapping relationship between the dynamic energy variation of the wind turbines and the control parameters of the machine-side converter is obtained, and then the dynamic energy of the wind turbines is obtained The relationship between the aperiodic rate of change of and the operating data;

[0093] S3. With the goal of maximizing the non-periodic change rate of the dynamic energy of the wind turbine, a paramete...

Embodiment 2

[0096] Improvements are made on the basis of Embodiment 1. The operating data of the double-fed fan grid-connected system includes: the effective value I of the induced current on the stator side 0 , the effective value U of the induced voltage on the stator side 0 , Stator self-inductance L s , rotor self-inductance L r , stator and rotor mutual inductance L m , Fan rotor speed ω r , the voltage phasor U of the wind turbine grid-connected point, the current phasor I of the wind turbine grid-connected point, the useful power P of the wind turbine grid-connected point, the reactive power Q of the wind turbine grid-connected point, the power angle δ of the wind turbine, and the fundamental frequency f of the wind turbine grid-connected point.

[0097] Among them, the effective value of the induced current on the stator side I 0 , The effective value of the induced voltage on the stator side U 0 , the two can process the instantaneous value of the voltage and current on the ...

Embodiment 3

[0126] The present invention also provides a doubly-fed fan subsynchronous oscillation suppression system using the method described in Embodiment 1, such as image 3 As shown, it includes a data acquisition module, an energy-parameter relationship module, and a parameter optimization module. Wherein, the output end of the data acquisition module is connected to the input end of the energy-parameter relationship module and the input end one of the parameter optimization module respectively, and the output end of the energy-parameter relationship module is connected to the input end two of the parameter optimization module.

[0127] The data acquisition module is used to collect the operation data of the double-fed wind turbine grid-connected system when subsynchronous oscillation occurs in the double-fed wind turbine grid-connected system, and transmit it to the energy-parameter relationship module and the parameter optimization module.

[0128] The energy-parameter relationsh...

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Abstract

The invention relates to a converter control-based doubly-fed induction generator sub-synchronous oscillation suppression method and belongs to the technical field of doubly-fed induction generators.With the converter control-based doubly-fed induction generator sub-synchronous oscillation suppression method adopted, sub-synchronous oscillation cannot be suppressed in the prior art can be solved.The method comprises the following steps that: when a doubly-fed induction generator grid-connected system undergoes synchronous oscillation, the operating data of the doubly-fed induction generatorgrid-connected system are acquired; a mapping relation between the dynamic energy variable quantities of induction generators and the control parameters of generator-side converters is obtained according to the response process of the doubly-fed induction generators under a power grid disturbance condition and a doubly-fed induction generator sub-synchronous oscillation divergence mechanism, so that the non-periodic change rate of the dynamic energy of the induction generators is obtained; a parameter optimization model is established with maximizing the non-periodic change rate adopted as anobjective, the inner ring control parameters of the generator-side converter of each induction generator in the doubly-fed induction generator grid-connected system are cooperatively optimized, and sub-synchronous oscillation is suppressed. With the converter control-based doubly-fed induction generator sub-synchronous oscillation suppression method of the invention adopted, the parameters of thedoubly-fed induction generators can be optimized and adjusted under a multi-constraint condition, and the generation of sub-synchronous oscillation can be effectively and effectively controlled.

Description

technical field [0001] The invention relates to the technical field of doubly-fed wind turbines, in particular to a method and system for suppressing subsynchronous oscillation of doubly-fed wind turbines based on converter control. Background technique [0002] When subsynchronous oscillation occurs in the traditional doubly-fed wind turbine grid-connected system, passive measures such as "cutting off" are mostly used. With the advancement of technology, Guyuan Wind Farm has adopted the measure of timely exiting series compensation to destroy the oscillation circuit for subsynchronous oscillation. However, this method requires frequent switching and withdrawing of series compensation, which greatly reduces the service life of the equipment. [0003] The oscillation characteristics of double-fed wind turbines are affected by various factors such as wind speed, fan position, and converter control parameters. Since wind speed and fan position are generally regarded as uncontr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/386H02J3/24H02J3/002H02J2203/20Y02E10/76
Inventor 马静张涌新刘静李鹏冲
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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