Method for evaluating minimum inertia demand of direct current outward transmission system considering differences in multi-frequency resource support characteristics

Abstract

The present application belongs to the technical field of inertia evaluation, and discloses a minimum inertia demand evaluation method of a direct current outward transmission system considering the difference of multi-frequency modulation resource support characteristics, which firstly analyzes the frequency response characteristics of each frequency modulation resource in the direct current outward transmission system under a typical control mode, establishes a system frequency response model considering the difference of wind power, photovoltaic and extra-high voltage direct current frequency response characteristics, and reveals the influence mechanism of different frequency modulation resources on the system frequency characteristics. Secondly, an equivalent inertia calculation model of the system considering the inertia support role of wind power and photovoltaic is constructed, and a minimum inertia demand evaluation method based on the constraint of initial frequency change rate is proposed. Then, considering the influence of the direct current frequency limiting controller on the maximum frequency deviation, a minimum inertia evaluation scheme of the direct current outward transmission system considering the frequency dynamic safety constraint is designed to support the efficient, stable and continuous transmission of new energy power generation.

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