Energy storage charging and discharging control method in wind-storage integrated system

Abstract

The invention discloses an energy storage charging and discharging control method for a wind storage integrated system. The method comprises the steps that whether the wind storage integrated system resists the wind power pitch peak is judged, the influence of wave amplitude value changes of wind power capacity on power grid frequency and voltage at different time scales is analyzed, then the wind power capacity wave limit amplitude value acceptable by a power grid at the corresponding time scales is determined, and the capacity wave limit value of a given wind power plant in the power grid is determined; further, the factors such as the occupied energy storage charging and discharging power is as small as possible are taken into account, the wind power actual capacity change values at adjacent time frames in different load subareas are obtained in a real-time on-line monitoring mode, a comparator in an energy storage monitoring system in the wind storage integrated system compares the difference value of the wind power actual capacity change values at adjacent time frames with the wind power capacity wave limit amplitude value, a comparison result signal is sent to a controller of the energy storage monitoring system, and the controller controls an energy storage device to charge and discharge according to the received signal.

Description

technical field [0001] The invention relates to a method for controlling charging and discharging of energy storage in an integrated wind storage system. Background technique [0002] With the rapid development of wind power, its proportion in the power generation structure of the whole network is increasing. Wind power is a typical random and intermittent power source, and the grid connection of large-scale wind power will inevitably bring a series of challenges to the power system. The impacts caused by wind power access to the grid mainly include: (1) The random fluctuation of wind power makes wind power a disturbance source, posing a threat to the stable operation of the power system; (3) Due to the limited ability of the grid to withstand disturbances, it will be difficult to absorb wind power that exceeds the capacity of the grid; (4) The volatility of wind power will cause voltage fluctuations at system access points, resulting in flash Change and other power qualit...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing energy storage charging and discharging control method ignoring the stability of the power grid, and considering the impact of wind power on the stability of the power system, a method for controlling the charging and discharging of the energy storage system in the wind storage integrated system is proposed , the invention is based on the principle of stochastic production simulation, which can suppress the reverse peak regulation and output fluctuation of wind power output

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