Flywheel energy storage participates in frequency modulation power division control based on improving power grid assessment index of north China power grid

doi:10.19799/j.cnki.2095-4239.2022.0653

Abstract

Abstract:

Given the estimations that carbon emissions will peak by 2030 and carbon neutrality will be achieved by 2060 in China, large-scale new energy sources, with wind and solar as the main force, are connected to the grid. The increase in energy consumption leads to serious environmental problems. This may be resolved by using new energy, and accordingly, the structure of power generation has undergone significant changes. The large-scale grid-connected new energy is associated with randomness and volatility. In addition, grid frequency fluctuation can be easily caused after penetrating the power grid, and this seriously threatens the safety of the grid. This issue can be resolved by improving the frequency modulation supported by the power generation side. An energy storage system integrated with thermal power units participates in the primary frequency modulation, resulting in improved security of power grids and improved economic efficiency. To realize the advantages of flywheel energy storage auxiliary frequency modulation of the power grid, the frequency modulation capability of the combined thermal power-flywheel system was analyzed based on the model, considering the influence of current energy storage on frequency modulation. In this regard, this paper proposes a control strategy for flywheel energy storage participating in frequency modulation division based on improving the power grid assessment index of the north China power grid. The strategy is calculated according to the current electric quantity of flywheel energy storage, and different output time limits are adopted in different electric quantities to meet the primary frequency regulation assessment index of the power grid. The frequency modulation effect of the system and the output of frequency modulation resources under load disturbance are analyzed using MATLAB/Simulink software. The results show that the proposed method can effectively improve the frequency modulation performance of the unit and improve the quantitative index of the unit with different discharge times under different conditions of the flywheel energy storage. Thus, the proposed method provides good support to the frequency modulation index at different power levels and effectively improves the economic assessment and efficiency of a power plant.

Key words: flywheel energy storage, primary frequency modulation, small-scale energy storage, dividing electric quantity, quantitative indicators

CLC Number:

TM 61

Haishan LIU, Xianlong XU, Shuzhou WEI, Yalei PANG, Feng HONG. Flywheel energy storage participates in frequency modulation power division control based on improving power grid assessment index of north China power grid[J]. Energy Storage Science and Technology, 2023, 12(4): 1176-1184.

Figures/Tables 13

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特征参数	数值
K	6
P	1/315
P₀	0.01
b	0.4
r	13

主要参数	数值
调速器时间常数T_g/s	0.1
机组功频特性系数R	0.05
高压蒸汽容积时间常数T_CH/s	0.3
中压蒸汽容积时间常数T_RH/s	10
低压蒸汽容积时间常数T_CO/s	0.5
高压缸功率系数F_HP	0.3
中压缸功率系数F_IP	0.3
低压缸功率系数F_LP	0.4
发电机惯性常数H	2
发电机负荷阻尼系数D	12

主要参数	数值
定子电阻R_s/Ω	0.097
永磁磁链Ψ_f/Wb	0.1286
粘滞摩擦系数B/(N·m·s)	1100
定子电感L/mH	2.085
极对数n_p	2
飞轮转动惯量J/(kg·m²)	24.2

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