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.
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