Hybrid energy storage system and wind power generation power smooth control method

Abstract

The invention discloses a hybrid energy storage system and a wind power generation power smooth control method. Firstly, a frequency spectrum of a wind power signal is obtained through a quick Fourier method, and amplitude-frequency characteristics of wind output power are analyzed; then, wind power is decomposed in multiple scales through an empirical mode decomposition method and then reconstructed into wind farm expected grid-connection power and high-frequency, mediate-frequency and low-frequency wind power fluctuation power; the power is distributed according to the capacity of a super-capacitor Soc, correspondingly adjusted and absorbs high-frequency, mediate-frequency and low-frequency fluctuation signal power through the super-capacitor, a storage battery and stored compressed air energy; when the output power of a wind farm is smaller than an expected grid-connection power signal, a hybrid energy storage system composed of the super-capacitor, the storage battery and an CAES is controlled to discharge through a model algorithm; when the output power of the wind farm is larger than expected grid-connection power, the hybrid energy storage system composed of the super-capacitor, the storage battery and the CAES is controlled to charge through the model algorithm. The hybrid energy storage system and the wind power generation power smooth control method improve safety and economic efficiency of grid-connection operation.

Description

technical field [0001] The invention belongs to the technical field of wind-storage combined power generation, and in particular relates to a hybrid energy storage system and a wind power generation power smoothing control method. Background technique [0002] With the depletion of energy and the increasing demand for energy, renewable energy has been widely favored by people, among which wind power has attracted more attention because of its green and sustainable characteristics. However, due to the volatility and randomness of wind power itself, large-scale wind power grid integration will bring a series of technical difficulties to the safe and stable operation of the power system, such as voltage fluctuations, voltage deviations, and harmonics. In order to improve the grid-connected operation capability of wind farms, more and more researchers use energy storage technology to regulate the output power of wind turbines to maximize the benefits of wind farms. When stabili...

AI Technical Summary

Problems solved by technology

For the energy allocation strategy based on low-pass filter, the output power of energy storage has a certain lag compared with the output power of wind power, which leads to a large range of energy adjustment of the energy storage system and a long adjustment period.

Moreover, the selection of the filter time constant depends heavily on experience.

Therefore, with the large-scale grid connection of wind power, traditional control methods can no longer meet the requirements in some aspects. In order to maximize the utility of energy storage systems, multi-strategy and advanced control will be the focus of future development.

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