Frequency active support strategy based on wind storage system

Abstract

The invention discloses a frequency active support strategy based on a wind storage system, and the strategy is characterized by comprising the following steps of: S1, wind speed partitioning; S2, frequency dead zone correction; S3, unit reactive power compensation; and S4, determination of a cooperative control strategy; the wind speed interval where a draught fan is located is judged according to the running state of the draught fan, and the power of the wind storage system is adjusted to achieve frequency supporting, while the unit characteristics and the energy storage system performance are fully utilized, secondary falling of system frequency caused by draught fan power recovery, load fatigue caused by frequent action of pitch angle mechanical parts and economic loss caused by limited power frequency modulation to grid-connected operation of a wind power plant are avoided.

Description

technical field [0001] The invention relates to the field, in particular to a frequency active support strategy based on a wind storage system. Background technique [0002] Wind turbines control the grid-connected power through power electronic components, so that there is no direct coupling between the rotor speed of the turbine and the grid frequency, resulting in the wind turbines not having the frequency support capability of a synchronous machine. Therefore, in a system with a high proportion of wind power connected, the total inertia of the system will be reduced due to the replacement of traditional synchronous units by wind turbines, threatening the frequency stability of the system. [0003] In the existing technology, in order to solve the frequency stability problem caused by the large-scale wind farm access system, a large number of power control links at home and abroad have added virtual inertia response, that is, the frequency change rate of the system is use...

AI Technical Summary

Problems solved by technology

Its response capability is directly related to the operating state of the wind turbine. The random fluctuation of wind speed makes it impossible for the wind turbine to provide reliable and long-lasting inertia response capability, and the lack or excess of active power generated during the speed recovery process of the wind turbine exiting the frequency support state will also cause system frequency The secondary fluctuation of the wind farm; the reserve capacity of the unit by limiting the power can improve the availability of power to support the frequency fluctuation, but the long-term reserved power will affect the economic benefits of the wind farm, and the release of the reserved power through the pitch angle will not only Causes frequent movement of mechanical parts, which is not conducive to the mechanical friendliness of wind turbines, and mechanical delay may also reduce the time performance of power response

[0004] For example, a "A Method and System for Setting Virtual Inertia Control Parameters of Wind Turbine Units" disclosed in Chinese patent literature, its announcement number: CN113131495A, discloses adjusting virtual inertia parameters to obtain optimal virtual inertia parameters, with low reliability

Images