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Comprehensive frequency modulation control method for wind power plant

A control method and wind farm technology, applied in wind power generation, single-network parallel feed arrangement, etc., can solve the problems of weakening the frequency regulation ability of traditional thermal power and hydropower units, the lack of frequency regulation function of new energy units, and the increase of the proportion of new energy units, etc.

Active Publication Date: 2020-06-19
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

As the penetration rate of new energy in the power grid gradually increases, the proportion of new energy units has also increased significantly, weakening the frequency regulation capabilities of traditional thermal power and hydropower units, while new energy units lack effective frequency regulation functions, which is not conducive to the frequency stability of the system sex
[0003] At present, the research on frequency modulation control of wind turbines can be roughly divided into two categories: wind farm level and wind turbine level. Control at the wind farm level mainly distributes active power to each wind turbine, including control input selection, allocation calculation methods, communication transmission and other issues. , there are also studies on the use of additional energy storage systems with frequency modulation. The control at the fan level mainly improves the control algorithm of a single fan, including virtual inertia control, droop control, pitch angle frequency modulation control, etc., to optimize the active power of the fan; but related In the research, there are few studies and analyzes on the impact of wind speed differences on the frequency modulation function, which is not conducive to fully utilizing the frequency modulation function of each wind turbine and the entire wind farm
[0004] The distribution control at the wind farm level is difficult to consider the influence of the wind speed difference of each fan at the fan level and the frequency difference at the connection bus of the fan due to communication problems, so it is difficult to achieve differential distribution control of a single fan in a specific situation. The structure and parameter optimization did not take into account the influence of other wind turbines in the wind farm. When the frequency modulation functions of the wind turbines in a large-scale wind farm are started at the same time or very close to each other, it will cause large disturbances, which is not conducive to the stable operation of the grid.

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[0034] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention provides a comprehensive frequency modulation control method for a wind power plant. The method comprises: according to the rotating speed-power curve of the fan at different wind speeds, setting object function thereof, obtaining the maximum value of the target function; determining rotating speed limit values of the fan at different wind speeds; forming rotation speed limiting intervals of different wind speeds, merging the rotation speed limiting intervals into comprehensive frequency modulation control, performing reciprocal operation of weighted average on the wind speed, frequency difference and frequency change rate of a fan to obtain frequency modulation action delay of each fan, and staggering frequency modulation action time of each fan in a wind power plant throughmatching of a time sequence of the frequency modulation action delay of the fan. According to the comprehensive frequency modulation control method, the wind speed difference and relative independence of each fan are considered, each fan is matched according to the time sequence, the frequency modulation action time of each fan of the large-scale wind power plant is staggered, the time sequence matching among the fans of the wind power plant is realized, and greater transient disturbance caused by simultaneous action is avoided.

Description

technical field [0001] The invention relates to the field of power system control, in particular to a comprehensive frequency modulation control method for a wind farm. Background technique [0002] The traditional power system realizes the system frequency regulation function through the cooperation of the unit's primary frequency regulation and secondary frequency regulation. As the penetration rate of new energy in the power grid gradually increases, the proportion of new energy units has also increased significantly, weakening the frequency regulation capabilities of traditional thermal power and hydropower units, while new energy units lack effective frequency regulation functions, which is not conducive to the frequency stability of the system sex. [0003] At present, the research on frequency modulation control of wind turbines can be roughly divided into two categories: wind farm level and wind turbine level. Control at the wind farm level mainly distributes active...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/48
CPCH02J3/48Y02E10/76
Inventor 向川杨蕾何鑫奚鑫泽何廷一
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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