Equivalent modeling method of doubly-fed wind power plant considering auxiliary frequency modulation service

Abstract

The invention discloses an equivalent modeling method of a doubly-fed wind power plant considering an auxiliary frequency modulation service. The equivalent modeling method is characterized by comprising the following steps: 1, building a detailed model of the doubly-fed wind power plant; 2, randomly generating the input wind speed of the doubly-fed unit; 3, judging the working mode of the doubly-fed unit participating in the auxiliary frequency modulation service; 4, completing cluster division according to the difference of the auxiliary frequency modulation service working mode, and representing a cluster by using an equivalent quantity; and 5, establishing an equivalent model of the doubly-fed wind power plant. According to the method, accurate representation of the working mode when an internal unit of the doubly-fed wind power plant participates in the auxiliary frequency modulation service of the power grid is realized, and the fitting precision of the equivalent model of the doubly-fed wind power plant for the external power characteristics of the wind power plant is improved.

Description

technical field [0001] The invention relates to the stability research field of a wind power grid-connected system, in particular to an equivalent modeling method of a doubly-fed wind farm taking into account auxiliary frequency modulation services. Background technique [0002] Under the guidance of the policy of “developing renewable energy such as wind power and photovoltaics, and improving the consumption level of clean energy”, the grid-connected capacity of new energy power generation in my country will continue to increase, while some thermal power units that also undertake traditional frequency regulation tasks face the risk of shutting down . The rising proportion of new energy and the declining proportion of thermal power will greatly reduce the inertial response of the power system, the ability of primary frequency regulation and secondary frequency regulation, and further increase the frequency regulation pressure on my country's power grid. In order to ensure th...

AI Technical Summary

Problems solved by technology

At present, the research on equivalent modeling methods of doubly-fed wind farms is mostly carried out around the division of coherent clusters and the aggregation classification algorithm. For the extraction of cluster division indicators, the main considerations are the differences in the working section of the wind power characteristic curve, the generator speed The difference of pitch angle, crowbar protection, unloading protection and other actions, did not take into account the influence of auxiliary frequency regulation service on the operating characteristics of doubly-fed wind turbines and the accuracy of coherent group division results

For example, in the auxiliary frequency modulation service mode, the doubly-fed wind turbine will no longer operate in the maximum power point tracking mode, and the difference in speed between the wind turbines will also be reduced, making it difficult to apply the original division method of coherent wind turbines

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