FREQUENCY CHARACTERISTIC ANALYSIS OF WIND SOLAR THERMAL STORAGE COMBINED SYSTEM CONSIDERING UNCERTAINTY OF NEW ENERGY

Zhang Junhua; Guo Xinyi; Zhao Zhenyu; Chen Caifu

doi:10.19912/j.0254-0096.tynxb.2024-1414

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 437-447. DOI: 10.19912/j.0254-0096.tynxb.2024-1414

FREQUENCY CHARACTERISTIC ANALYSIS OF WIND SOLAR THERMAL STORAGE COMBINED SYSTEM CONSIDERING UNCERTAINTY OF NEW ENERGY

Zhang Junhua¹, Guo Xinyi¹, Zhao Zhenyu², Chen Caifu²

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Abstract

In order to solve the problem that the traditional frequency characteristic analysis method cannot accurately capture the influence of new energy participation inertia support and primary frequency regulation on the frequency characteristics of the system, this paper proposes a power system frequency dynamic model based on the contribution of wind-solar-storage multi-resource frequency regulation. The model comprehensively describes the transient and steady-state characteristics of the system frequency under the conditions of new energy grid connection by introducing the uncertainty of new energy output and energy storage regulation mechanism. Then, an analytical relationship is established between frequency deviation, frequency dead zone, primary frequency modulation coefficient, and the power capacity of each unit. The feasibility boundary of the active output of the energy storage unit not exceeding the limit is derived, and a parameter optimization method under capacity constraints was proposed to determine the optimal energy storage frequency modulation coefficient, effectively improving the accuracy and stability of frequency regulation. Finally, simulation results verify that the proposed method has significant advantages in improving the frequency stability of the system.

Key words

power system stability / renewable energy resource / frequency response / boundary conditions / constrained optimization

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Zhang Junhua, Guo Xinyi, Zhao Zhenyu, Chen Caifu. FREQUENCY CHARACTERISTIC ANALYSIS OF WIND SOLAR THERMAL STORAGE COMBINED SYSTEM CONSIDERING UNCERTAINTY OF NEW ENERGY[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 437-447 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1414

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