Control method for stabilizing fluctuation of wind power by energy storage system

Abstract

The invention discloses a control method for stabilizing the fluctuation of wind power by an energy storage system. Data acquisition equipment acquires wind power data, wind storage synthesized output force data and state of charge (SOC) data, and inputs the data into a stabilizing control module; in the stabilizing control module, a maximum wind farm active power change limit value Plimit' per minute is used as a control target, a control principle that the control target is met and the energy storage system of a battery has relatively high charging / discharging capacity is adopted, and the input data are calculated according to a stabilizing control strategy; the wind power data PWG(k) is subtracted from the wind storage synthesized output force Pout(k-1) to obtain a different value deltaP(k); the obtained different value deltaP(k) is compared with the wind minute-level active power change limit value Plimit' and the maximum output force limit value maxPbess of the energy storage system of the battery so as to judge whether the energy storage system of the battery participates in regulation and control over the wind power output force; when deltaP(k) is greater than the Plimit' and less than the maxPbess, a control instruction for controlling the energy storage system of the battery is output; a battery management system (BMS) controls the output force of the energy storage system of the battery; therefore, the fluctuation of the wind power is stabilized, and the negative effects of the wind power on a power grid is reduced.

Description

technical field [0001] The invention relates to a control method for applying a battery energy storage system to stabilize wind power fluctuations in wind power grid connection. Background technique [0002] The inherent intermittent volatility of wind power causes its large-scale grid connection to endanger the safety and stability of power grid operation, and poses great challenges to power grid frequency regulation and reserve capacity planning. As a result, wind power abandonment in major wind farms is serious, seriously affecting economic benefits. Wind power has the characteristics of randomness and intermittent nature, and objectively requires a certain scale of flexible and adjustable power supply to match it. [0003] The battery energy storage system can effectively solve this problem by stabilizing the wind power, and achieve a win-win situation for the grid and the wind farm. In the electricity market environment, the competitiveness of wind power is relatively ...

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Problems solved by technology

[0008] Chinese patent 201010258529.5 "A battery charging and discharging control method for smoothing wind farm power fluctuations", through the control method of controlling battery charging when the active power of wind power is greater than the allowable upper limit of the grid, and controlling the discharge of the battery when the active power is less than the lower limit of the grid to smooth wind power The shortcoming is that its control target does not match the current wind power grid-connected standards and the status quo of grid-connected application requirements, and its practicability is not strong

Chinese patent 201110059831.2 "Adaptive smoothing method for wind power output based on energy storage battery state of charge feedback", which uses the first-order filter principle to output the control target, resulting in a deviation between the wind power output and the control target, so the battery energy storage system will always be in charge. Or discharge working state, which is not conducive to prolonging the service life of the battery

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