Subsynchronous oscillation suppressing method and device for wind generation set

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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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 method and device for wind turbines to solve the technical problem of subsynchronous oscillation between the wind turbine and the series compensation line

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