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Critical oscillation wind speed-based adaptive frequency modulation control system and method for doubly-fed wind generator

A doubly-fed fan and control system technology, applied in the control system, generator control circuit, control generator, etc., can solve the problem of weakening the frequency modulation capability of the system, reduce the risk of system oscillation instability, avoid system oscillation instability, Improve the effect of frequency modulation ability and power support ability

Active Publication Date: 2022-01-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

At present, in order to obtain the maximum energy utilization rate, various types of wind turbine grid-connected converters adopt a power regulation method independent of the grid, resulting in no coupling relationship between the rotor speed and the system frequency, and the moment of inertia of the wind turbine is zero. input will obviously weaken the FM capability of the system

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  • Critical oscillation wind speed-based adaptive frequency modulation control system and method for doubly-fed wind generator
  • Critical oscillation wind speed-based adaptive frequency modulation control system and method for doubly-fed wind generator
  • Critical oscillation wind speed-based adaptive frequency modulation control system and method for doubly-fed wind generator

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Embodiment Construction

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0051] The purpose of the present invention is to provide a doubly-fed wind turbine adaptive frequency modulation control system and method based on the critical oscillation wind speed. By detecting the operating state of the system, based on the relationship between the actual operating wind speed and the critical oscillation wind speed, the virtual synchronous generator control Reasonably switch between droop control and system oscillation, and improve the in...

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Abstract

The invention discloses a critical oscillation wind speed-based adaptive frequency modulation control system and method for a doubly-fed wind generator. The system comprises the steps: enabling a doubly-fed wind generator set DFIG1 to adapt to the frequency modulation demands at different operation wind speeds through the adaptive switching of a virtual synchronous generator and a droop control strategy; and specifically, according to control parameters of the system, establishing a small signal model of the wind generator system under virtual synchronous control, calculating the critical oscillation wind speed of the system, and reasonable switching between virtual synchronous machine control and droop control by comparing the actual operation wind speed with the critical oscillation wind speed of the system. According to the critical oscillation wind speed-based adaptive frequency modulation control system and method for the doubly-fed wind generator, the double-fed fan can adapt to different wind speeds, and the frequency modulation effect is improved on the premise that the oscillation instability risk of the system is reduced.

Description

technical field [0001] The invention relates to the technical field of power generation system control, in particular to an adaptive frequency modulation control system and method for double-fed wind turbines based on critical oscillation wind speed. Background technique [0002] With the large-scale integration of a high proportion of renewable energy, the impact of the integration of large wind turbines on the transient characteristics of the system has received extensive attention. At present, in order to obtain the maximum energy utilization rate, various forms of wind turbine grid-connected converters adopt a power regulation method independent of the grid, which leads to the decoupling of the power control of the converter from the grid frequency, and the doubly fed wind turbine (Doubly fed Induction Generator (DFIG) has become the mainstream model in the wind power market due to its advantages of high wind energy conversion efficiency, simple grid connection, and low ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/38H02J3/24H02P9/00H02P101/15
CPCH02J3/48H02J3/381H02J3/241H02P9/007H02J2203/20H02J2300/28H02P2101/15
Inventor 李永刚贺梦娟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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