Wind power station subsynchronous resonance suppression method and system

A resonance suppression, wind farm technology, applied in the field of power system, can solve problems such as poor economy, complex reconstruction, fan damage, etc., to achieve the effect of improving stability and suppressing subsynchronous resonance

Active Publication Date: 2017-09-19
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

In 2009, a wind farm in Texas, USA, due to a fault in the power transmission system, part of the line was cut off, which increased the series compensation from 50% to 75%, resulting in subsynchronous oscillations in the wind farm, resulting in damage to a large number of wind turbines
However, these methods are complex and economical

Method used

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  • Wind power station subsynchronous resonance suppression method and system
  • Wind power station subsynchronous resonance suppression method and system
  • Wind power station subsynchronous resonance suppression method and system

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Embodiment Construction

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0040] The subsynchronous resonance suppression method and subsynchronous resonance suppression system of a wind farm according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0041] figure 1 It is a flowchart of a subsynchronous resonance suppression method for a wind farm according to an embodiment of the present invention.

[0042] Before explaining this method, combine the figure 2 As shown, the wind farm at least includes: multiple wind turbines, multiple transfor...

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Abstract

The invention discloses a wind power station subsynchronous resonance suppression method and system, the wind power station at least comprises: a plurality of wind turbines, a plurality of transformers and wind power station lines, the wind power station is characterized in that: acquiring voltage signals and current signals of wind power station lines, resistance and inductance of the plurality of wind turbines, resistance and inductance of the plurality of transformers, resistance and inductance of the wind power station lines and current signals actually outputted from the subsynchronous suppression system to a power grid; performing filtering processing on voltage signals and current signals of the wind power station lines, obtaining subsynchronous frequency signals, according to the subsynchronous frequency signals, the resistance and the inductance of the plurality of wind turbines, the resistance and the inductance of the plurality of transformers and the resistance and the inductance of the wind power station lines, obtaining wind power station closed loop transfer functions, and according to the current signals actually outputted from the subsynchronous suppression system to a power grid, optimizing the attenuation rate of the closed loop transfer functions under different zero points through optimizing parameters. According to the invention, the stability of the wind power station can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a subsynchronous resonance suppression method and system for a wind farm. Background technique [0002] When wind farms are connected to systems with fixed series compensation capacitors, there may be a risk of inducing subsynchronous resonance (SSR). In recent years, there have been many accidents related to fan subsynchronous oscillation at home and abroad. In 2009, a wind farm in Texas, USA, due to a fault in the power transmission system, part of the line was cut off, which increased the series compensation from 50% to 75%, resulting in subsynchronous oscillations in the wind farm, resulting in damage to a large number of wind turbines . [0003] In related technologies, the method of suppressing the subsynchronous resonance of the wind farm is mainly to change the internal control system of the wind turbine, and increase the damping of the electromagnetic torque of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386Y02E10/76
Inventor 谢小荣张旭
Owner TSINGHUA UNIV
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