Method for restraining subsynchronous oscillation caused by grid connection of draught fan based on SVG

A technology of sub-synchronous oscillation and wind turbine, applied in the direction of reducing/preventing power oscillation, wind power generation, AC network circuit, etc., can solve the problems of system collapse, affecting system stability, lasting for a long time, etc., to expand the field and simplify the expansion. handy effect

Active Publication Date: 2015-02-04
辽宁荣信兴业电力技术有限公司 +2
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Problems solved by technology

If the system exhibits low damping characteristics at this frequency, the subsynchronous oscillation will last for a long time, thus affecting the stability of the system to a certain extent; if the system exhibits negative damping characteristics at this frequency, the subsynchronous oscillation current will be continuously amplified , which eventually crashes the system

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  • Method for restraining subsynchronous oscillation caused by grid connection of draught fan based on SVG
  • Method for restraining subsynchronous oscillation caused by grid connection of draught fan based on SVG
  • Method for restraining subsynchronous oscillation caused by grid connection of draught fan based on SVG

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] see Figure 1 to Figure 5 . The invention is based on the SVG method for suppressing the subsynchronous oscillation caused by wind power grid connection, including the measurement of the system current oscillation frequency, the design and correction of the band-pass filter, the SVG current loop control design, and the distributed compensation compensation for the wind power grid connection subsynchronous oscillation Strategy.

[0024] The first step is to measure the characteristic frequency of the grid subsynchronous oscillation current. That is, in the range of 2Hz to 50Hz, measure the current flowing into the power grid of the wind turbine, and perform FFT analysis to obtain all subsynchronous oscillation frequencies, such as figure 1 shown. exist figure 1 In it, it is found that the system has a subsynchronous current component around 40Hz. ...

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Abstract

The invention discloses a method for restraining subsynchronous oscillation caused by grid connection of a draught fan based on SVG. The method includes firstly measuring frequency of subsynchronous oscillating current of a power grid, performing FFT analysis, and thereby obtaining all subsynchronous oscillating frequencies. The difference between the working frequency and the subsynchronous current oscillating frequency of the system is set as the central frequency of a band-pass filter for designing the BPF (Band-Pass Filter). The SVG current loop control design namely includes decoupling under a DQ rotating coordinate system, and enabling subsynchronous oscillating current signals obtained through detecting under the DQ rotating coordinate system to pass through the filter to obtain reactive current commands. The compensation strategy for compensating subsynchronous oscillation caused by grid connection of wind power in a distributed manner namely includes: through the design of distributed SVG compensation points, increasing capacity of the SVG for compensating subsynchronous oscillating current of the power grid, and restraining the problem of subsynchronous oscillation caused by grid connection of wind power at different nodes in a targeted manner.

Description

technical field [0001] The invention relates to a reactive power compensation system of a power grid, in particular to a method for suppressing sub-synchronous oscillation caused when a fan of a wind power plant is connected to the grid. Background technique [0002] At present, in the long-distance large-scale power transmission technology of wind farms, two technologies are mainly used, namely series compensation capacitor technology and DC transmission technology. However, both of these two technologies may cause subsynchronous oscillations in the wind power system, that is, oscillations with a frequency of 2-50 Hz, which will seriously affect the reliability of power transmission and cause a large number of wind turbines to be disconnected. [0003] Subsynchronous oscillations in the grid are usually caused by the resonant frequency of the series capacitor and are amplified by falling near the modal frequency of the generator or near the resonant frequency of the control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/18H02J3/38
CPCH02J3/1814H02J3/24H02J3/386Y02E10/76Y02E40/10
Inventor 郭自勇孙贤大李海生王绪宝杨洋魏斌楚淑玲王飞义王继浩孔祥声杨永飞
Owner 辽宁荣信兴业电力技术有限公司
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