A wind power grid-connected frequency regulation method and system based on doubly-fed asynchronous wind generators

Abstract

The invention discloses a wind power grid integration frequency modulation method based on a double-fed asynchronous wind driven generator. The wind driven generator is connected with a frequency converter used for controlling the reference torque of the wind driven generator; the method includes the following steps of judging whether or not a rotator of the wind driven generator reaches the ratedrotation speed; if not, adopting an inertia response frequency modulation method; if yes, adopting a one-time frequency modulation method; adopting an active power output mode for changing the wind driven generator to change the rotation speed of the wind driven generator, and achieving frequency modulation of a power grid. The invention further discloses a frequency modulation system which includes the wind driven generator, the frequency converter and a controller, and the controller is internally provided with an inertia response frequency modulation module and a one-time frequency modulation module. According to the method, on the basis of the random volatility of wind speed, a response to a frequency modulation policy is made, the frequency of the power grid recovers fast, the secondary drop of the frequency can be inhibited without relying on hardware energy storage equipment, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to a grid frequency regulation method and system for a wind power grid-connected system. Background technique [0002] In wind power generation technology, the wind power generation system based on doubly fed-induction generation (DFIG) has obvious advantages compared with the traditional constant-speed and constant-frequency wind power generation system based on ordinary asynchronous generators. Gradually become the mainstream model in the wind power market. According to the relevant requirements of wind power grid connection in various countries, wind power participation in system frequency regulation will become an inevitable requirement for future power grid development. [0003] The double-fed wind turbine controls the output of electromagnetic power (including active power and reactive power) through the frequency converter. Due to the decoupling of its mechanical power and system electromagnetic power, and the decoupling o...

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Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a wind power grid-connected frequency modulation method based on doubly-fed asynchronous wind power generators, which solves the technical problem in the prior art that wind turbines fail to participate in system frequency modulation well, and can be achieved without increasing Under the premise of hardware facilities, the active output of wind turbines is changed through software program control to help the system grid frequency return to normal

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