Rotate speed recovery method, device and system for double-fed wind power virtual synchronizer

A technology of virtual synchronous machine and doubly-fed wind power, which is applied in the direction of wind power generation, wind engine, wind engine control, etc., can solve the problems of difficulty in realization, secondary drop of fan frequency, high cost, etc., and achieve the goal of improving the problem of secondary drop of frequency Effect

Pending Publication Date: 2018-09-07
NORTH CHINA ELECTRICAL POWER RES INST +3
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  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of serious secondary drop in frequency when the wind turbine exits frequency regulation, high cost, difficult implementation and low reliability of the existing technology...

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  • Rotate speed recovery method, device and system for double-fed wind power virtual synchronizer
  • Rotate speed recovery method, device and system for double-fed wind power virtual synchronizer
  • Rotate speed recovery method, device and system for double-fed wind power virtual synchronizer

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Embodiment Construction

[0030] The embodiment of the present invention provides a speed recovery method, device and system of a doubly-fed wind power virtual synchronous machine.

[0031] 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 creative efforts fall within the protection scope of the present invention.

[0032] Such as Figure 1A and Figure 1B Shown is the simulation diagram of the MPPT speed recovery mode in the prior art, Figure 1A shows the frequency characteristics of the system when a 4% load disturbance occurs in a power grid with DFIG installed capacity accounting for 20%. Figure 1B Two phases of fre...

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Abstract

The invention provides a rotate speed recovery method, device and system for a double-fed wind power virtual synchronizer. The method comprises the following steps: collecting the rotate speed of a fan and judging whether the rotate speed of the fan reaches the lower limiting value or not; when the rotate speed of the fan reaches the lower limiting value, adjusting the output power of the fan to apower fixed value under the circumstance that the rotate speed of the fan is invariable, wherein the power fixed value is calculated from the wind speed when the rotate speed of the fan reaches the lower limiting value and the angular frequency of a wind wheel; keeping the output power invariable, and adjusting the rotate speed of the fan to a tracing rotate speed, wherein the tracing rotate speed is determined according to the power fixed value; and recovering the rotate speed of the fan to the rotate speed of the fan at the steady work point corresponding to the wind speed according to themaximum power point tracing curve.

Description

technical field [0001] The invention relates to the field of doubly-fed wind turbines, in particular to a speed recovery method, device and system of a doubly-fed wind power virtual synchronous machine. Background technique [0002] With the depletion of traditional energy and the aggravation of environmental problems, new energy power generation technologies represented by photovoltaics and wind power are developing rapidly, and double-fed wind turbines account for a considerable proportion of them. Since the doubly-fed wind turbine uses an asynchronous generator, its output power has almost no coupling with the frequency and voltage of the grid, so it is difficult to provide the necessary frequency and voltage support for the grid. As the penetration rate of double-fed wind turbines in the power grid continues to increase, it is urgently required that double-fed wind turbines have the same frequency and voltage regulation capabilities as traditional synchronous generators....

Claims

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Application Information

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IPC IPC(8): F03D7/00
CPCF03D7/00F05B2270/304F05B2270/1033Y02E10/72
Inventor 王晓声田博葛俊宋鹏刘辉崔阳李智孙大卫程雪坤巩宇
Owner NORTH CHINA ELECTRICAL POWER RES INST
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