A comprehensive frequency regulation method for power grid based on the frequency regulation capability of doubly-fed wind turbines in wind farms

Abstract

The invention discloses a comprehensive frequency regulation method for power grids based on the frequency regulation capability of double-fed wind turbines in wind farms. Starting from the physical characteristics of DFIG double-fed wind power generators, the concept of wind volume is proposed, and the DFIG in the wind farm is measured by it. The tuning capability of the device. When the frequency deviation of the power grid is less than 0.2Hz, only the DFIG fan with the largest wind volume is used for frequency adjustment alone, so that the frequency deviation can be eliminated quickly; Carry out power task division; in the specific details of individual frequency modulation and multi-machine cooperative frequency modulation, the wind speed factor is also considered, especially when the current wind speed is lower than the rated wind speed, the virtual inertia is adjusted according to the difference adjustment coefficient calculated by the wind speed segment where DFIG is located The method model parameters make the frequency regulation more rapid and stable, and finally realize the goal of stable wind power generation frequency under the conditions of complex wind farms and differentiated units.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for comprehensive frequency regulation of a power grid based on the frequency regulation capability of double-fed wind turbines in a wind farm. Background technique [0002] Doubly-fed Induction Generator (DFIG) is the most widely used wind generator at present. It is a wound-type asynchronous generator directly connected to a fixed-frequency three-phase grid by a stator winding and a two-way back-to-back installed on a rotor winding. IGBT voltage source converter composition. [0003] According to national regulations, the frequency of the power grid system should be controlled within the range of plus or minus 0.2Hz of the rated frequency error for 98% of the time. When the frequency deviation is greater than 0.2Hz, the power grid should take emergency control measures. However, due to the complexity of wind farms and the differences of wind turbines, if a constan...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a comprehensive power grid frequency modulation method based on the frequency modulation capability of doubly-fed wind turbines in wind farms, which solves the problem that the existing ideal DFIG control method cannot be used in complex wind farms and differentiated unit conditions. The problem of providing stable power grid frequency under

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