Wind power plant virtual inertia increasing method based on wind-storage cooperative operation

Abstract

The invention discloses a wind power plant virtual inertia increasing method based on wind-storage cooperative operation. Fan operation features in different wind speeds are analyzed and zoning is performed on the wind speeds. Through detecting system frequency fluctuation and digging frequency adjustment potential and energy storage power features of the fan itself, system frequency fluctuation is responded with real time control of active power of a wind storage system, so that increase of a virtual inertia of the wind power plant is realized. According to the invention, wind-storage combined system inertia can be improved effectively, and also, the combined system can be enabled to give active power response to frequency fluctuation in multiple wind conditions and problems such as secondary falling of frequency can be avoided at the same time. Therefore, system frequency stability is improved.

Description

technical field [0001] The invention relates to a method for improving virtual inertia of a wind farm based on wind-storage coordinated operation. Background technique [0002] With the increase of wind power grid-connected capacity year by year, the intermittent and random characteristics of wind power output power make the connection of large-scale wind power generation bring new challenges to power system planning, operation control, protection, dispatching and other aspects. challenge. Among them, the double fed induction generator (DFIG) is the most widely used variable-speed constant-frequency wind turbine in wind farms. This type of wind turbine output active power through a power electronic converter with variable speed and constant frequency. The fan rotor is not directly connected to the grid. The synchronous unit uses the kinetic energy of the rotor to damp the inertial frequency response capability of the system frequency change. However, in a regional power g...

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Problems solved by technology

When the existing literature exists, it is still necessary to operate in a load-shedding state for a long time to reserve spare capacity, which sacrifices the maximum wind energy capture efficiency of the wind turbine; it will result in a high demand for energy storage capacity. Given that the current energy storage cost is still high, relying solely on The economy of energy storage to compensate the inertia of the wind field has yet to be considered, or the difference in the frequency modulation capability of the fan under different wind speeds and the coping strategies under variable wind speeds have not been considered

[0005] Therefore, although the existing research can improve the inertial response capability of the wind turbine to a certain extent, and support the active power of the wind turbine to the system frequency fluctuation, it does not make full use of the "hidden" inertia and energy storage of the wind turbine itself. Fast and accurate power characterization

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