Double-battery fluctuation out-of-limit optimization method in wind storage combined system

Abstract

The invention discloses a double-battery fluctuation out-of-limit optimization method in a wind storage combined system, and the method comprises the steps: firstly carrying out the segmented averaging of wind power on the basis of wind power prediction, and enabling the segmented average power to serve as target power after the power stabilization of the wind storage combined system; secondly, determining the charging and discharging power of the double batteries according to the target power and the actual sending power of the wind generating set, controlling the charging and discharging state of the double storage batteries, and calculating the charge state of the double storage batteries in the out-of-limit control period in real time; meanwhile, on the basis of wind power prediction,predicting whether the charge state of the double-storage battery pack in the next out-of-limit control period fluctuates out of limit or not, so that whether double-battery charging and discharging state switching is carried out in advance of the out-of-limit control period or not is determined. By means of the method, the randomly-changed wind power can be kept unchanged within a period of time,and wind power friendly access is achieved; and the out-of-limit condition of the state-of-charge fluctuation of the double storage battery packs is improved, the charging and discharging depth is optimized, and the method is suitable for high-turbulence and low-turbulence wind speeds.

Description

technical field [0001] The invention relates to the technical field of wind power smoothing, in particular to a simple and convenient dual-battery fluctuation optimization method in a wind-storage combined system that can optimize the fluctuation of the state of charge of the dual-battery beyond the limit. Background technique [0002] In recent years, the state has encouraged the distributed development of wind power, and some areas of our country have excellent conditions for the development of wind farms. With the rapid development of wind power generation in recent years, wind energy has become a new form of energy utilization. However, due to the randomness and intermittent nature of wind power, when large-scale wind power is directly connected to the large power grid, it will have a negative impact on power quality. Equipping wind farms with energy storage systems with a certain capacity, using the characteristics of energy storage systems to absorb and release power,...

AI Technical Summary

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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