Optimal control method for wind farm energy storage lithium battery based on unit inertial energy storage

Abstract

The invention discloses a wind farm energy storage lithium-ion electricity optimizing control method based on set inertial energy storage, and relates to a wind farm hybrid energy storage system combined mode and a capacity control method thereof. The wind farm energy storage lithium-ion electricity optimizing control method based on set inertial energy storage is characterized by comprising the following steps that (1) wind farm prediction capture power in a traditional control mode is calculated according to a wind farm prediction wind speed; (2) fast Fourier transform is conducted on the wind farm prediction power, so that a wind electricity power spectral characteristic curve, an output power high-frequency signal and an output power low-frequency signal are obtained; (3) the high-frequency component for restraining active output power of a set is stored through inertial kinetic energy of the set itself when wind farm output power undergoes primary smoothing; (4) a lithium battery is used for energy storage so that a smoothing task to the low-frequency component of wind farm output power waves can be achieved; (5) an evaluation index is established, and wind farm lithium battery capacity is controlled in an optimizing mode. According to the technical scheme, electric energy quality and energy storage economic benefits can be improved, and the service life of batteries is prolonged.

Description

technical field [0001] The invention belongs to the technical field of wind farm active power control, and in particular relates to an energy storage system operation control method. Background technique [0002] Wind power generation is an important way to solve environmental pollution and energy crisis. It is the strategic focus of my country's realization of "structural adjustment and transformation promotion" and the main direction of developing low-carbon economy. It is also the focus of my country's energy development. However, the randomness and intermittent nature of wind energy lead to the fluctuation of wind power, which brings challenges in wind power quality and accommodation. The energy storage system can absorb and release energy according to the control strategy, and it is an available means to smooth the output power of wind power. [0003] The energy storage methods that can be used in wind farms mainly include chemical battery energy storage, flywheel ener...

AI Technical Summary

Problems solved by technology

Use the inertial kinetic energy storage of the unit itself to suppress the high-frequency components between 0.01 and 1Hz and the peak value in a short time, and at the same time provide an optimal control method for wind farm energy storage lithium batteries based on inertial energy storage. Lithium battery energy storage smooths low-frequency fluctuations in power (10 -5 ~0.01Hz), this method comprehensively considers the economic benefits of the energy storage system, the life of the lithium battery, and the target of power smoothing, etc., and solves the problems of frequent charge-discharge transitions and overcharge and over-discharge working states during the battery energy storage operation. the adverse impact of

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