Wind power fluctuation suppression method of hybrid energy storage wind power generation system

Abstract

The invention discloses a wind power fluctuation suppression method of a hybrid energy storage wind power generation system, and belongs to the field of wind power fluctuation control technologies of a hybrid energy storage system. The method comprises the steps of: acquiring the output power of a wind power plant at a moment t as well as the output power of the hybrid energy storage wind power generation system at a previous moment (t-1); performing empirical mode decomposition operation on the output power of the wind power plant at the moment t to obtain n intrinsic mode function components and one remainder term; calculating the output power of a hybrid energy storage sub-system at the moment t; determining the charging-discharging priorities of a battery and a super capacitor at the moment t; calculating the output powers of both the battery and the super capacitor at the moment t; respectively controlling the battery and the super capacitor to output powers according to the output powers of both the battery and the super capacitor at the moment t; and repeating the above steps when entering the next moment (t+1). The wind power fluctuation suppression method provided by the invention solves the problem of output delay of a conventional filter algorithm, and overcomes the disadvantages that a single energy storage medium is poor in fluctuation suppression capability and short in service life.

Description

technical field [0001] The invention belongs to the technical field of wind power fluctuation control of a hybrid energy storage system, and in particular relates to a method for suppressing wind power fluctuation of a hybrid energy storage type wind power generation system. Background technique [0002] Wind power has become the third largest power source in my country, but the inherent intermittent volatility of wind power makes its large-scale grid connection endanger the safety and stability of power grid operation, and poses great challenges to power grid frequency regulation and reserve capacity planning. The combination of large-scale energy storage and large-capacity wind power generation systems is a necessary trend for the development of renewable energy. [0003] Common energy storage devices can be divided into power type and energy type energy storage devices. Energy-based energy storage systems (such as batteries) have high energy density, but slow response sp...

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Problems solved by technology

[0006] The object of the present invention is to propose a method for suppressing wind power fluctuations of a hybrid energy storage type wind power generation system to solve the power output lag existing in the prior art when smoothing the wind power fluctuations of a power and energy hybrid energy storage type wind power system, This leads to the disadvantage of requiring a large energy storage capacity, and the problem that the respective characteristics of the hybrid energy storage device cannot be fully utilized when distributing power

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