Power coordinated control strategy of flywheel energy storage array for wind power smoothing

doi:10.19799/j.cnki.2095-4239.2021.0421

Abstract

Abstract:

Wind energy output often shows randomness and fluctuation, making it difficult to adjust the frequency of the power grid. In this study, wind energy is smoothed by flywheel energy storage to reduce its power fluctuation and improve its grid-connection ability. First, a power coordinated control method is proposed to ensure that the power value allocated to each unit does not exceed its rated power and that the state of charge (SOC) of each unit converges to the same value. Simultaneously, the layered and grouped control method for the energy storage array is adopted to ensure the accuracy of power regulation and the energy storage system's response speed. Then, we develop a power-following control model for the flywheel energy storage unit and a power-following control model for the flywheel energy storage array. The feasibility and superiority of the proposed coordinated control technique are verified through charge and discharge simulations of a group of flywheel energy storage units. Finally, a flywheel energy storage array is used to compensate for the high frequency components of wind energy in real time, thereby smoothing out wind energy output power fluctuations. The 2 MW flywheel energy storage array is used to supplement 10 MW wind energy. The 2 MW flywheel energy storage array is composed of eight 250 kW/50 kW·h flywheel energy storage units, whereas the 10 MW wind energy system is composed of five 2 MW wind turbines. Finally, the flywheel energy storage is used to compensate for the high frequency components of wind energy in real time, thereby smoothing out the fluctuation in wind energy output power. The 2 MW flywheel energy storage array is used to supplement the wind farm's 10 MW capacity. The 2 MW flywheel energy storage array is composed of eight 250 kW/50 (kW·h) flywheel energy storage units, whereas the 10 MW wind energy system is composed of five 2 MW wind turbines. The flywheel energy storage array is modeled using simulation software, and the simulation data for 200 min of wind generation is used. The simulations verify the feasibility of the proposed control strategy and hierarchical grouping control method, as well as the fact that flywheel energy storage matched to wind energy can significantly reduce the fluctuation of wind power and satisfy the requirements of the national standards (GB/T 19963—2011).

Key words: wind power smoothing, flywheel energy storage array, power coordinated control strategy

CLC Number:

TK 89

Yulong CHEN, Xin WU, Wei TENG, Yibing LIU. Power coordinated control strategy of flywheel energy storage array for wind power smoothing[J]. Energy Storage Science and Technology, 2022, 11(2): 600-608.

Figures/Tables 12

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参数	数值	参数	数值
额定功率P₀/kW	250	额定转速n_{_base}/(r/min)	3600
额定电压U/V	380	额定频率F1_base/Hz	120
最低运行转速n_{_min}/(r/min)	3600	电机极对数n_p	2
最高运行转速n_{_max}/(r/min)	11500	额定转矩Te_{_base}/ Nm	663
储能量 E_n/(kW·h)	50	转子总转动惯量 J/(kg·m²)	250

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