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

A technology of sub-synchronous resonance and doubly-fed fans, applied in the direction of harmonic reduction device, control electromechanical transmission device, circuit device, etc., can solve the problems of increasing hardware equipment, increasing complexity and equipment cost, etc., and achieve the purpose of suppressing sub-synchronous resonance Effect

Inactive Publication Date: 2018-04-17
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, a controllable series compensation device must be added, and hardware equipment needs to be correspondingly added to the existing line, which increases the complexity and equipment cost of the existing line improvement.

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] According to the control strategy and hardware composition of the doubly-fed converter, you can choose to add a damping control strategy in the rotor-side converter, and you can also choose to add a damping control strategy in the stator-side converter. For example, it can be determined whether to add a damping control strategy to the rotor-side converter or to add a damping control strategy to the stator-side converter according to the hardware composition or control strategy of the doubly-fed converter produced by different manufacturers.

[0017] Figure 1a It is a flowchart of a method for suppressing subsynchronous resonance through a stator-side converter of a doubly-fed fan provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation where an additional controller is added to the converter on the stator side of the doubly-fed fan to suppress subsynchronous resonance. The method can be implemented by a device for suppressing su...

Embodiment 2

[0071] figure 2 It is another control strategy diagram of the double-fed fan stator side converter in the second embodiment of the present invention. The technical solution of this embodiment is based on the above embodiments, preferably, the additional controller may include a band-pass filtering module and a phase shifting module.

[0072] Band-pass filtering module: determine a corresponding band-pass filter according to the sub-synchronous resonance frequency, and extract a sub-synchronous component corresponding to the sub-synchronous resonance frequency from the rotational speed signal through the band-pass filter.

[0073] Wherein, the band-pass filter module is a second-order synchronous band-pass filter, and the transfer function of the band-pass filter is:

[0074]

[0075] Among them, ω c is the characteristic angular frequency of the bandpass filter, ω c =2πf ssr , f ssr is the subsynchronous resonance frequency; ξ is the damping ratio of the band-pass fil...

Embodiment 3

[0082] image 3 It is a structural schematic diagram of a device for suppressing subsynchronous resonance through a stator-side converter of a doubly-fed fan in Embodiment 3 of the present invention. The control device of the stator side converter of the double-fed fan includes:

[0083] A signal determination unit 310, configured to determine the rotational speed signal and the subsynchronous resonance frequency of the doubly-fed fan rotor;

[0084] An additional controller determination unit 320, configured to determine an additional controller according to the amplitude-frequency characteristics and phase-frequency characteristics of the relational expression between the electromagnetic torque variation and the rotational speed variation, wherein the additional controller includes a band-pass filter module and a phase-shifting module;

[0085] An additional control signal determining unit 330, configured to obtain an additional control signal by multiplying the rotational...

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Abstract

The invention discloses a method and a device for suppressing subsynchronous resonance through a doubly-fed fan stator side converter. The method comprises the steps as follows: a rotating speed signal and a subsynchronous resonance frequency of a doubly-fed fan rotor are obtained; an additional controller is determined according to the amplitude-frequency characteristics and the phase-frequency characteristics of the relationships of an electromagnetic torque variation and a rotating speed variation; the additional controller comprises a band-pass filter module and a phase-shift module; an additional control signal is obtained by multiplying a rotating speed signal with a transfer function of the additional controller to obtain an additional control signal; the additional control signal is injected into the stator side converter and is superposed to an output signal of the stator side converter to generate an additional torque of suppressing the subsynchronous resonance; 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] The invention relates to the technical field of electric power system control, in particular to a method and device for suppressing subsynchronous resonance through a converter on the stator side of a doubly-fed fan. Background technique [0002] Series capacitance compensation can significantly improve line transmission capacity and transient stability, and can be applied in long-distance wind power transmission, but there is also the risk of inducing subsynchronous resonance (SubSynchrous Resonance, English abbreviation for SSR). [0003] The SSR problem of wind farms has received extensive attention from academia and industry. Numerous studies have shown that DFIGs are more likely to cause SSR problems than other types of units. The SSR instability is caused by the interaction between the doubly-fed wind turbine, the control system of the power electronic converter, and the series-compensated transmission line. The existing solution is to add a co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/38H02P21/28
CPCH02J3/01H02J3/386Y02E10/76Y02E40/40
Inventor 董晓亮
Owner 国家电网有限公司华北分部