Subsynchronous oscillation suppressing method and device for wind generation set

A subsynchronous oscillation, wind turbine technology, applied in circuit devices, wind power generation, reducing/preventing power oscillation, etc., to achieve the effect of easy engineering transformation, no hardware circuit transformation cost, and suppression of subsynchronous oscillation

Active Publication Date: 2018-06-22
NORTH CHINA ELECTRICAL POWER RES INST +3
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Problems solved by technology

[0004] In order to overcome the defects of the above-mentioned prior art, the present invention proposes a subsynchronous oscillation suppression meth

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  • Subsynchronous oscillation suppressing method and device for wind generation set
  • Subsynchronous oscillation suppressing method and device for wind generation set
  • Subsynchronous oscillation suppressing method and device for wind generation set

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[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present invention.

[0045] figure 1 It is a schematic diagram of the connection of wind turbines connected to the grid via series compensation lines, such as figure 1 As shown, the converter controller controls the converter, and transmits the electric energy generated by the doubly-fed induction generator 1 to the power grid 6 through the transformer 4 and the series compensation line 5. The converter controller includes the machine-side controller 21 and The grid-si...

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Abstract

The invention provides a subsynchronous oscillation suppressing method and device for a wind generation set. The subsynchronous oscillation suppressing method includes: acquiring a stator current signal of a wind generation set in a synchronous rotation coordinate system, and calculating the subsynchronous oscillation frequency according to the stator current signal; querying and acquiring a phaseangle deviation ratio, a phase deviation time constant, and a proportionality coefficient which are corresponding to the subsynchronous oscillation frequency according to a phase angle deviation table, a proportionality coefficient table, and the subsynchronous oscillation frequency; generating a subsynchronous oscillation control signal according to the phase angle deviation ratio, the phase deviation time constant, the proportionality coefficient, and the stator current signal; and inputting the subsynchronous oscillation control signal to a basic network side control inner loop of the windgeneration set. In a special implementation aspect, an original detection and computing performance of a network side converter in a dual-fed set is utilized, subsynchronous oscillation is suppressedthrough a software control strategy upgrading, the cost of hardware loop reconstruction can be avoided, and engineering reconstruction is facilitated.

Description

technical field [0001] The invention relates to the field of new energy power generation, in particular to a subsynchronous oscillation suppression method and device for wind turbines. Background technique [0002] When the series compensation degree between the wind turbine and the series compensation line is high, electrical resonance with a frequency lower than the rated frequency may be generated in the line due to disturbance. If the natural torsional vibration frequency of a certain shafting of the generator is complementary to the electrical resonance frequency, a Torsional vibration amplification, that is, subsynchronous resonance (Subsynchronous Resonance, SSR) damages the shafting of the generator, thereby endangering the operation of the power grid. Subsynchronous oscillations between wind power and series-compensated lines have occurred in many areas at home and abroad, such as Texas in the United States and northern Hebei and Northeast China. However, subsynchr...

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386Y02E10/76
Inventor 李蕴红刘辉宁文元吴林林洪丹过亮孙素娟
Owner NORTH CHINA ELECTRICAL POWER RES INST
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