Distributed secondary frequency modulation control method considering energy storage

Abstract

The invention discloses a distributed secondary frequency modulation control method considering energy storage, and belongs to the technical field of power grid secondary frequency modulation power generation. An inferiority index function based on the charge and discharge power offset and the state of charge offset is established for the condition of secondary frequency modulation having participation of energy storage, and the inferiority index function based on the power offset is established for the condition of secondary frequency modulation having participation of the conventional motorset. The consistency variable of a frequency modulation power supply is determined by the partial derivative of the inferiority index function relative to the power offset, and then the secondary frequency modulation demand quantity is allocated according to the proportion of the maximum power offset of the frequency modulation power supply relative to the total frequency modulation power of the system. Minimization of the power offset and the state of charge offset acts as the consistency variable of the target iterative update frequency modulation power supply, and the rapidity of energy storage frequency modulation response is fully utilized so that accurate tracking of the system ACE signal can be realized, the power grid frequency modulation capacity can be enhanced and the system robustness can be enhanced.

Description

technical field [0001] The invention discloses a distributed secondary frequency regulation control method considering energy storage, and belongs to the technical field of power generation related to secondary frequency regulation of power grids. Background technique [0002] In order to promote the optimization and upgrading of the energy industry and achieve clean and low-carbon development, in recent years, my country has vigorously developed clean energy, wind power and photovoltaics have achieved leapfrog development, and the proportion of new energy installed capacity is increasing day by day. However, with the rapid development of clean energy, the grid connection of fluctuating intermittent new energy causes the inertia of the regional power grid to decrease, the frequency modulation capacity is insufficient, and frequency instability is caused. Therefore, the frequency modulation capacity of traditional power sources has been difficult to meet the frequency modulati...

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Problems solved by technology

[0010] The purpose of the present invention is to address the above-mentioned shortcomings of the background technology, and to provide a distributed secondary frequency modulation control method that takes energy storage into account. The minimization of the displacement reduces the operating loss of the equipment and increases the service life of the FM power supply while improving the robustness of the system. It solves the problem that the existing secondary frequency regulation scheme that takes energy storage into account does not fully utilize the energy storage and quickly respond to the frequency regulation requirements. capacity and technical issues that cannot guarantee the remaining charge and discharge capacity of energy storage

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