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Method for improving system damping and modeling based on double-fed fan rapid active power modulation

A technology of active power and doubly-fed wind turbines, applied in the field of power systems, can solve problems such as differential algebraic equations without mathematical models, complex converter control systems, and reactive power coupling.

Pending Publication Date: 2020-04-07
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for improving system damping and modeling based on fast active power modulation of doubly-fed wind turbines, so as to solve the stability research of the wind turbine grid-connected system in the prior art but there is a control system with a converter Complex and active and reactive coupling; there are technical problems such as the lack of a complete mathematical model and the defects of giving a detailed system of differential algebraic equations

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  • Method for improving system damping and modeling based on double-fed fan rapid active power modulation
  • Method for improving system damping and modeling based on double-fed fan rapid active power modulation
  • Method for improving system damping and modeling based on double-fed fan rapid active power modulation

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Embodiment Construction

[0048]A method for improving system damping and modeling based on fast active power modulation of doubly-fed wind turbines. In this method, the incremental Δω of generator angular velocity is selected as the input signal of damping control on the basis of traditional double-closed-loop control structure of wind turbines, and the increase of DFIG rotor power The quantity ΔP is added to the active power control loop of the doubly-fed fan as an output signal, which effectively improves the damping of the system and improves the dynamic behavior of the system.

[0049] A method for improving system damping by rapidly modulating the active output of a doubly-fed fan, characterized in that the analysis method includes the following steps:

[0050] (A) The dynamic mathematical model modeling of double-fed fan single-unit infinite system includes wind turbine model, transmission system model, induction generator model, and converter model.

[0051] ① The relationship between the wind ...

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Abstract

The invention discloses a method for improving system damping and modeling based on double-fed fan rapid active power modulation. According to the method for improving the system damping, on the basisof an existing fan double-closed-loop control structure, the increment [delta][omega] of the angular speed of a generator is selected as an input signal of damping control, the increment [delta]P ofthe rotor power of a DFIG serves as an output signal and is added to a double-fed draught fan active power control loop to improve the damping of a system, and the dynamic behavior of the system is improved; the problems that in the prior art, the stability of a fan grid-connected system is researched, but a control system of a converter is complex and active and reactive coupling exists are solved; and the technical problems that a complete mathematical model does not exist, and a detailed differential algebraic equation set of the system is given exist.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a method for improving system damping and modeling based on fast active power modulation of a double-fed fan. Background technique [0002] As the penetration rate of wind power continues to increase, the access mode of wind power has changed from the original small-capacity distributed access to centralized large-scale access. Therefore, it is necessary to study the impact of a large number of wind turbines on the grid stability. When the proportion of wind energy in the system is large, its dynamic impact on the power system cannot be ignored. Therefore, it is of great significance to study the damping controller of the wind turbine to improve the stability of the power system. At present, wind turbines suppress the low-frequency oscillation of the power system mainly by adding damping controllers in the active power loop and reactive power loop. Many schol...

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/24H02P21/26H02P21/28
CPCH02J3/48H02J3/24H02P21/26H02P21/28Y02E10/76
Inventor 古庭赟徐长宝林呈辉吕黔苏高吉普伍华伟李军牛唯张俊玮肖小兵范强赵轩陈相吉徐梅梅龙秋风张历幸明勇汪明媚孟令雯顾威祝健杨李博文
Owner GUIZHOU POWER GRID CO LTD
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