Simulation of the primary frequency modulation process of thermal power units with the auxiliary of flywheel energy storage

doi:10.19799/j.cnki.2095-4239.2021.0283

Abstract

Abstract:

Herein, a two-area grid model is established to analyze the effect of primary frequency modulation of thermal power units with the auxiliary of flywheel energy storage. The effects of the system and the output power situations of frequency-modulation resources with or without flywheel energy storage in the case of step and continuous disturbance are analyzed using MATLAB/Simulink. The simulation results show that, compared with the separate frequency modulation of thermal power units, because the flywheel energy storage can quickly respond to the frequency deviation signal, the maximum transient deviation of frequency in the process of frequency modulation can be reduced. The steady-state frequency deviation of the system is reduced by 7.58×10^-5 per unit under step disturbance, and the maximum frequency deviation of the two areas is reduced by 2.02×10^-4 and 1.47×10^-4 per unit under continuous disturbance with flywheel energy storage. Moreover, the maximum change of exchange power is reduced by 2.84 × 10^-4 and 1.52 × 10^-3 per unit under the step and continuous disturbance, respectively. Because flywheel energy storage undertakes part in the frequency-modulation task, the steady-state output-power variation of thermal power units under step disturbance is reduced by 1.517 × 10^-3 per unit, and the variation range of the output power of the thermal power units is reduced in the entire frequency modulation process under continuous disturbance. Excessive charge or discharge does not significantly influence the life of flywheel energy storage. Hence, the upper and lower limits of its state of charge can be set higher. The state of charge of flywheel energy storage is constrained by logistic functions, the discharge power is limited when the state of charge is low, and the charge power is limited when the state of charge is high. In the entire process of primary frequency modulation simulation, the state of charge of flywheel energy storage is in a good range. Herein, the special case of the initial value of the state of charge being one and zero is simulated, and the results show that the function can help the state of charge gradually recover from the dangerous range to the normal range. Comprehensive analysis shows that using flywheel energy storage to assist primary frequency modulation can reduce the frequency deviation of power systems, the variation range of exchange power, the frequency-modulation burden of the thermal power units, and the variation range of the output power of the thermal power units, and increase the life of the thermal power units.

Key words: flywheel energy storage, thermal power units, primary frequency modulation, state of charge

CLC Number:

TM 712

Linxuan HE, Wenyan LI. Simulation of the primary frequency modulation process of thermal power units with the auxiliary of flywheel energy storage[J]. Energy Storage Science and Technology, 2021, 10(5): 1679-1686.

Figures/Tables 14

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参数	数值	参数	数值
T_g	0.08	T_CO	0.5
K_g	20	H	2
F_HP	0.3	D	12
F_IP	0.3	T₁₂	0.881
F_LP	0.4	T_F	0.02
T_CH	0.3	K_F	16.7
T_RH	10

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