Abstract
The randomness and volatility of wind energy bring great challenges to wind power grid-connected. The hybrid energy storage technology based on electrolysis cell hydrogen production and super capacitor has become an effective way to stabilize wind power fluctuations. Based on the establishment of the grid-type wind-hydrogen coupling system working characteristic constraint and the minimum initial investment cost of the hybrid energy storage system, an alkaline electrolytic cell-super capacitor hybrid storage based on low-pass filtering-fluctuation observation is proposed. The method can be configured, and a hybrid energy storage coordinated control strategy based on the super capacitor SOC (state of charge) is developed. The case study results show that the hybrid energy storage system configuration method and control strategy proposed in this paper are effective, which can reduce the fluctuation of wind power grid-connected power to meet the grid connection standard.
Highlights
Wind power is the main form of utilization of renewable energy
In view of this, based on the study of the wind hydrogen coupling system and the actual external characteristics of the alkaline electrolyzer, the configuration method and process of the electrolyzer super capacitor hybrid energy storage system are established based on the low-pass filter volatility observation method, and the optimal coordination control strategy is formulated
According to the determined filter coefficient, the theoretical power absorption curve of the super capacitor is obtained, and the capacity is configured according to the boundary conditions of the super capacitor, and the power of the electrolytic cell is configured considering the coordinated control strategy of hybrid energy storage
Summary
Wind power is the main form of utilization of renewable energy. Its rapid and large-scale development makes it difficult for grids to absorb wind power and the problem of abandoning wind power is getting worse. In reference [9], based on the analysis of the spectrum characteristics of wind power, the wavelet packet decomposition technology is used to decompose it into low-frequency grid connected part and high-frequency part, and the probability density function of fluctuating power is fitted by Fourier approximation to obtain the expected energy storage capacity configuration and optimize the energy storage capacity. In view of this, based on the study of the wind hydrogen coupling system and the actual external characteristics of the alkaline electrolyzer, the configuration method and process of the electrolyzer super capacitor hybrid energy storage system are established based on the low-pass filter volatility observation method, and the optimal coordination control strategy is formulated. The effectiveness of the configuration method and control strategy is verified by the case simulation
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