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Dfig Subsynchronous Oscillation Suppression Method Based on Multi-branch Impedance Reshaping

A sub-synchronous oscillation and multi-branch technology, applied in the direction of reducing/preventing power oscillation, single-network parallel feed arrangement, etc., can solve the problems that sub-synchronous oscillation cannot be suppressed, the degree of sub-synchronous oscillation is serious, and the suppression effect is limited. Guaranteed stability and economy, improved suppression effect, strong suppression effect

Active Publication Date: 2022-05-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The first two types of suppression strategies need to add hardware devices to the system, which is not economical in cost
However, the existing subsynchronous damping controller strategy on the control loop of wind turbine converter only adds virtual resistance to the rotor side converter (RSC), and the suppression effect is limited.
Especially for wind power systems with high series compensation degree, the degree of subsynchronous oscillation is relatively serious, and only adding virtual damping in RSC cannot suppress subsynchronous oscillation

Method used

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  • Dfig Subsynchronous Oscillation Suppression Method Based on Multi-branch Impedance Reshaping
  • Dfig Subsynchronous Oscillation Suppression Method Based on Multi-branch Impedance Reshaping
  • Dfig Subsynchronous Oscillation Suppression Method Based on Multi-branch Impedance Reshaping

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Embodiment Construction

[0016] The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only examples, rather than limiting the protection scope of the present invention.

[0017] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

[0018] The structure of double-fed wind power generation system is as follows: figure 1 As shown, including double-fed fan, GSC, RSC, grid-side filter, transformer, transmission line, series compensation capacitor, etc. Based on the original RSC impedance model (such as figure 2 shown), GSC impedance model (such as image 3 Shown) and the equivalent circuit of the impedance model of the doubly-fed wind power generation system established by the DFIG impedance model is as follows Figure 4 As shown, the impedance model is ...

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Abstract

The invention discloses a DFIG subsynchronous oscillation suppression method based on multi-branch impedance remodeling, which includes a filter for filtering the fundamental frequency component of the rotor current and the GSC current, a virtual impedance generating device corresponding to a voltage command for generating a virtual impedance, and the virtual impedance The corresponding voltage command is superimposed with the original voltage set value to obtain a new voltage set value suppressing device; additional virtual impedance is added to the rotor side converter (RSC) and grid side converter (GSC) of the doubly-fed wind turbine Control to change the equivalent impedance of the double-fed wind power generation system, so as to realize the rapid and effective suppression of subsynchronous oscillation, without adding other equipment to ensure the stability and economy of the present invention, and the suppression effect is stronger than the traditional additional damping control , has a suppression effect in the entire sub-same frequency band, which improves the suppression effect.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a DFIG subsynchronous oscillation suppression method based on multi-branch impedance remodeling. Background technique [0002] With the increase of wind power capacity, there have been many subsynchronous oscillations of large-scale wind farm grid-connected systems at home and abroad, resulting in a large area of ​​wind turbines being disconnected from the grid, which has seriously affected the security of the grid. In order to avoid this effect, fast and effective measures are needed to suppress the subsynchronous oscillation. [0003] Existing subsynchronous oscillation suppression strategies for doubly-fed wind generators (DFIG) are mainly divided into three categories: flexible transmission system and its additional additional damping controller, subsynchronous filter, and additional subsynchronous damping on the wind turbine converter control loop. controller....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24
Inventor 刘其辉唐光钰史淳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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