Centralized battery energy storage power station frequency modulation control strategy based on dynamic grouping technology

Abstract

The invention discloses a centralized battery energy storage power station frequency modulation control strategy based on a dynamic grouping technology. The method comprises the following steps: constructing an evaluation index system of a dynamic grouping technology, and designing a fitness function of an adaptive longhorn beetle algorithm; constructing a self-adaptive step length formula of the self-adaptive beetle antennae optimization algorithm; applying a self-adaptive longhorn beetle algorithm, and optimizing a forced updating threshold value of a dynamic grouping technology; determining an automatic update period of the dynamic grouping technology; grouping battery units, determining frequency modulation power instructions of three battery packs in an energy storage power station by applying a dynamic grouping technology, further determining a frequency modulation instruction of each battery unit, and enabling the battery units to respond. The self-adaptive beetle antennae optimization algorithm is used for searching and forcibly updating the threshold value, the charge state range of the battery unit after the response is finished is reduced, and the schedulable potential of the energy storage power station in the next scheduling period is improved; the action frequency of the energy storage system is reduced, and the operation economy of the energy storage system is improved.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a frequency modulation control strategy for a centralized battery energy storage power station. [0002] technical background [0003] As of the end of 2020, the cumulative installed capacity of energy storage projects in China was 35.6GW, accounting for 18.6% of the total global market size, a year-on-year increase of 9.8%, an increase of 6.2 percentage points over the same period in 2019. At the same time, wind power, photovoltaic and other renewable energy sources are connected to the grid on a large scale, and their intermittent and uncertain output characteristics have brought great pressure to the frequency regulation of the power system. [0004] Lithium-ion batteries are widely used in power system frequency modulation due to their advantages of large capacity, high operating voltage, wide allowable operating temperature range, and long cycle life. At the same time, centraliz...

AI Technical Summary

Problems solved by technology

However, if the battery energy storage system does not adopt a reasonable control strategy, it will cause the battery unit to move irregularly, and it is not conducive to the completion of the frequency modulation task.

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