Subsynchronous oscillation suppression method and system for direct drive wind farm

A sub-synchronous oscillation, wind farm technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve problems such as instability, failure to synergistically optimize performance, etc.

Active Publication Date: 2019-10-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a direct-drive wind farm subsynchronous oscillation suppression method and its system to solve the problem of unstable performance caused by the failure of the existing technology to coordinate optimization of all wind turbine parameters inside the wind farm. question

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  • Subsynchronous oscillation suppression method and system for direct drive wind farm
  • Subsynchronous oscillation suppression method and system for direct drive wind farm
  • Subsynchronous oscillation suppression method and system for direct drive wind farm

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Embodiment 1

[0118] A specific embodiment of the present invention discloses a method for suppressing subsynchronous oscillations of direct drive wind farms, such as figure 1 shown, including the following steps:

[0119] S1. Collect the operation data of the grid-connected system of the direct drive wind farm under the grid disturbance;

[0120] S2. According to the response process of the direct-drive wind farm grid-connected system under the grid disturbance and the sub-synchronous oscillation divergence mechanism of the direct-drive wind farm, the quantitative criterion of subsynchronous oscillation is obtained, and the quantitative criterion of subsynchronous oscillation is judged according to the above-mentioned operating data, and the judgment is made. Whether subsynchronous oscillation occurs;

[0121] S3. If it is determined that subsynchronous oscillation occurs, a multi-objective multi-constraint minimum optimization model is established, and the phase-locked loop and converter...

Embodiment 2

[0124] Optimizing on the basis of Example 1, the operating data of the grid-connected system of the direct drive wind farm includes: the voltage phasor U at the outlet of the fan, the useful work P at the outlet of the fan, the reactive work Q at the outlet of the fan, and the voltage phasor U at the outlet of the fan The phase angle δ.

[0125] PLL and converter PI parameters include: PLL proportional gain coefficient K p , Integral gain coefficient K i , grid-side converter current inner loop proportional gain coefficient K p1 , Integral gain coefficient K i1 .

[0126] Preferably, in step S2, the determination of whether subsynchronous oscillation occurs further includes the following steps:

[0127] S21. According to the response process of the direct-drive wind farm grid-connected system under grid disturbance and the subsynchronous oscillation divergence mechanism of the direct-drive wind farm, the amplitude criterion and phase angle criterion for subsynchronous osci...

Embodiment 3

[0177] The present invention also provides a direct-drive wind farm subsynchronous oscillation suppression system using the method described in Embodiment 1, such as image 3 As shown, the system includes a data acquisition module, a damping analysis module, and a parameter optimization module. Wherein, the output terminal of the data acquisition module is respectively connected with the input terminal one of the damping analysis module and the input terminal one of the parameter optimization module, and the output terminal of the damping analysis module is connected with the second input terminal of the parameter optimization module.

[0178] The data acquisition module is used to collect the operation data of the direct-drive wind farm grid-connected system under the grid disturbance, and transmit the obtained operation data to the damping analysis module and the parameter optimization module respectively.

[0179] The damping analysis module is used to obtain the subsynchro...

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Abstract

The invention relates to a subsynchronous oscillation suppression method and system for a direct drive wind farm, belongs to the technical field of a wind power grid connected and solves a problem ofunstable performance due to cooperation optimization of all the fan parameters of a wind farm in the prior art. The method comprises steps that operating data of a grid-connected system of the direct-drive wind farm under grid disturbance are collected; subsynchronous oscillation quantification criterion is obtained according to the response process of the grid-connected system of the direct-drivewind farm under grid disturbance and the subsynchronous oscillation divergence mechanism of the direct drive wind farm, the subsynchronous oscillation quantization criterion is determined based on the above operating data, whether or not sub-synchronous oscillation occurs is determined, if yes, a multi-target multi-constraint minimum optimization model is established, a phase-locked loop and converter PI parameters in the grid-connected system of the direct drive wind farm are collaboratively optimized, and subsynchronous oscillation suppression is performed. The method is advantaged in thatcooperation optimization of all the fans in the wind farm is achieved, and subsynchronous oscillation is effectively suppressed.

Description

technical field [0001] The invention relates to the technical field of wind power grid connection, in particular to a method and system for suppressing subsynchronous oscillations of direct-driven wind farms. Background technique [0002] With the continuous expansion of the scale and density of wind power access, subsynchronous oscillation problems related to wind farms in the power system have become more and more frequent, and have even seriously threatened the safe and stable operation of the power system, becoming an important factor restricting the development of wind power. . At present, it is necessary to find an effective suppression measure to solve the stability problem caused by the integration of wind power system into the power system. [0003] Since the occurrence of subsynchronous oscillation in Texas double-fed wind farm attracted attention in 2009, scholars at home and abroad have proposed a variety of suppression measures for subsynchronous oscillation, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/386H02J3/24H02J2203/20Y02E10/76
Inventor 马静吴羽翀杨更宇汪乐天
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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