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Method and device for suppressing subsynchronous resonance through doubly-fed fan rotor side converter

A rotor-side converter and subsynchronous resonance technology is applied in harmonic reduction devices, control electromechanical transmission devices, circuit devices, etc., which can solve the problems of low utilization rate of power electronic converters and increased equipment investment costs.

Inactive Publication Date: 2016-07-20
国家电网有限公司华北分部 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this way, high-power power electronic converters must be added, and corresponding hardware equipment needs to be added to the existing lines. There is a problem of increasing equipment investment costs and the utilization rate of the increased power electronic converters is not high.

Method used

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  • Method and device for suppressing subsynchronous resonance through doubly-fed fan rotor side converter
  • Method and device for suppressing subsynchronous resonance through doubly-fed fan rotor side converter
  • Method and device for suppressing subsynchronous resonance through doubly-fed fan rotor side converter

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Experimental program
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Effect test

Embodiment 1

[0023] Due to the different hardware structures and controller strategies of DFIG converters produced by different manufacturers for DFIGs. For DFIGs with certain hardware structures, it is suitable to add additional damping strategies to the rotor-side converters; correspondingly, for other DFIGs with different hardware structures, it is suitable to add additional damping strategies to in the stator side converter. Therefore, according to the characteristics of different doubly-fed converters, it is possible to choose whether to add a damping control strategy to the rotor-side converter or to add a damping control strategy to the stator-side converter.

[0024] Figure 1a It is a flow chart of the method for suppressing subsynchronous resonance through the converter on the rotor side of the DFIG in Embodiment 1 of the present invention. This embodiment is applicable to adjusting the control strategy of the converter on the rotor side of the DFIG to suppress subsynchronous res...

Embodiment 2

[0047] Figure 2a It is a strategy diagram of additional damping control in a rotor-side converter in Embodiment 2 of the present invention. The technical solution of this embodiment is based on the above embodiments, preferably, the additional controller may include a band-stop filter module, a band-pass filter module and a phase-shift module.

[0048] Calculate the relationship between the above-mentioned electromagnetic torque variation and rotational speed variation G Tersc The pole of It can be seen that the amplitude gain of the relational expression is ω at the angular frequency s -ω r near the maximum value (peak). However, this frequency is not subsynchronously resonant, so an additional controller includes the characteristic angular frequency ω s -ω r The band-stop filter block to minimize the amplitude gain at this frequency. The damping ratio ξ of the band-stop filter module 1 =0.5~1, and the larger the value of the damping ratio, the more the speed signal...

Embodiment 3

[0062] image 3 It is a structural schematic diagram of a device for suppressing subsynchronous resonance through a rotor-side converter of a doubly-fed fan in Embodiment 3 of the present invention. The control device of the rotor-side converter includes:

[0063] A signal acquisition unit 310, configured to acquire a rotational speed signal and a subsynchronous resonance frequency of the wind turbine rotor;

[0064] The additional control variable determination unit 320 is configured to determine an additional controller according to the amplitude-frequency characteristics and phase-frequency characteristics of the relationship between the rotational speed variation and the electromagnetic torque variation, and obtain the additional control quantity by processing the rotational speed signal through the additional controller , wherein the additional controller includes a band-stop filter module, a band-pass filter module and a phase-shift module;

[0065] The additional torq...

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PUM

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Abstract

The invention discloses a method and a device for suppressing subsynchronous resonance through a doubly-fed fan rotor side converter. The method comprises the steps as follows: a rotating speed signal and a subsynchronous resonance frequency of a wind generator rotor are obtained; an additional controller is determined according to the amplitude-frequency characteristics and the phase-frequency characteristics of the relationships of a rotating speed variation and an electromagnetic torque variation; the rotating speed signal is processed through the additional controller to obtain an additional controlled quantity; the additional controller comprises a band-stop filter module, a band-pass filter module and a phase-shift module; the additional controlled quantity is injected into the rotor side converter and is superposed to an original controlled quantity to generate an additional torque; and the phase difference between the additional torque and the rotating speed variation is within a range of 90-270 degrees, so that the target of suppressing the subsynchronous resonance in a doubly-fed fan series compensation transmission system is achieved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power system control, and in particular to a method and device for suppressing subsynchronous resonance through a double-fed fan rotor-side converter. Background technique [0002] Wind energy, as a renewable energy source, has been vigorously developed all over the world due to its mature technology. However, areas with rich wind resources are often far away from the load center. In order to solve the problem of wind power transmission, the transmission capacity of the line needs to be increased, and series capacitor compensation devices are often installed in long-distance high-voltage transmission lines. However, improper series capacitance compensation of transmission lines may induce subsynchronous resonance SSR (SubSynchrousResonance). [0003] The SSR problem of wind farms has received extensive attention from academia and industry. Numerous studies have shown that DFIGs are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38H02P21/26
CPCH02J3/01H02J3/386Y02E10/76Y02E40/40
Inventor 董晓亮
Owner 国家电网有限公司华北分部
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