A method and device for calculating optimal output of an energy storage system for smoothing wind power fluctuations

Abstract

The invention provides an optimal output calculation method and an optimal output calculation device for an energy storage system for smoothening wind power fluctuation, and is applied to the technical field of wind power generation. The optimal output calculation method includes performing the Fourier transform to ultra-short period wind power prediction curves to acquire a wind power prediction curve spectrogram, determining a cut-off frequency pre-selection interval for first-order low-pass filtering, performing first-order low-pass filtering to the ultra-short period wind power prediction curves to acquire a wind energy storage fluctuation rate prediction curve and a wind energy storage power prediction curve, determining the maximum cut-off frequency meeting the preset wind energy storage fluctuation rate, determining the optimal cut-off frequency selection interval, acquiring an energy storage power curve, calculating charge and discharge efficiency of the energy storage power curve, determining the optimal cut-off frequency, determining the optimal output curve of the energy storage system, and guiding output of the energy storage system according to the optimal output curve of the energy storage system. Optimization of energy status variation of the energy storage system is taken into consideration, and thus the overall implementing process is simple and easy to control, and the optimal output calculation method and the optimal output calculation device have good practicability.

Description

Technical field [0001] The present invention relates to the technical field of wind energy power generation, and specifically, to a method and device for calculating the optimal output of an energy storage system for smoothing wind power fluctuations. Background technique [0002] In recent years, distributed power supply technology based on wind power generation has become the focus of development in the energy field. However, due to the instability, volatility, and intermittent characteristics of wind power, large-scale wind power integration has seriously affected the stable operation of the power grid. Currently, The method of directly adjusting the operating status of the wind turbine or combining pitch and variable speed control is often used to smooth its output power. However, the adjustment ability of this method is very limited and cannot guarantee the continuity and stability of power generation and power supply. In the research to explore solutions, large-scale e...

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Problems solved by technology

[0002] In recent years, distributed power supply technology based on wind power generation has become the focus of development in the energy field. However, due to the characteristics of wind power such as instability, volatility and intermittency, large-scale wind power access has seriously affected the stable operation of the power grid. The method of directly adjusting the operating state of the wind turbine or combining pitch and variable speed control is often used to smooth its output power, but the adjustment ability of this method is very limited, and the continuous and stable power generation and power supply cannot be guaranteed.

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