A dual-battery fluctuation out-of-limit optimization method in a wind-storage combined system

Abstract

The invention discloses a method for optimizing fluctuations of double batteries in a combined wind-storage system. In the optimization method, the wind power is segmented and averaged on the basis of wind power prediction, and the segmented average power is used as the power after the wind-storage combined system is stabilized. The target power; secondly, according to the target power and the actual output power of the wind turbine, determine the charging and discharging power of the dual batteries, control the charging and discharging state of the dual battery packs, and calculate the state of charge of the dual battery packs in this limit control cycle in real time; at the same time On the basis of wind power prediction, it is predicted whether the state of charge of the dual-battery packs fluctuates beyond the limit in the next limit-off control cycle, so as to determine whether to switch the charge-discharge state of the dual-battery one limit-off control cycle in advance. The method of the present invention can keep the randomly changing wind power unchanged for a period of time, realize wind power friendly access; and improve the fluctuation of the state of charge of the double battery pack beyond the limit, optimize the charging and discharging depth, and is suitable for high turbulence and Low turbulent wind speed.

Description

technical field [0001] The invention relates to the technical field of wind power smoothing, in particular to a method for optimizing dual-battery fluctuation exceeding the limit in a wind-storage combined system which is simple and convenient and can optimize the double-battery state-of-charge fluctuation exceeding the limit. Background technique [0002] In recent years, the state has encouraged the distributed development of wind power, and some regions in my country have excellent conditions for developing wind farms. In recent years, wind power generation has developed rapidly, and wind energy has become a new form of energy utilization. However, due to its randomness and intermittency, when large-scale wind power is directly connected to the large power grid, it will bring adverse effects on power quality. Equipping a wind farm with an energy storage system with a certain capacity, using the characteristics of energy storage system to absorb and release power, and to ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems in the prior art of using dual batteries to achieve wind power smoothing and optimization of fluctuations in the state of charge of the dual batteries, and to provide a method for optimizing the fluctuations of dual batteries in a combined wind-storage system. According to the state of charge of the dual battery packs in the next limit-off control cycle, the charge-discharge state switching of the double-battery packs is carried out in advance, so as to improve the fluctuation and over-limit problem of the double-battery packs, optimize the charge-discharge depth, thereby prolonging the battery life and realizing smooth wind power

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