Self-adaptive flexible control method based on distributed multi-bus access energy storage

Abstract

The invention discloses a self-adaptive flexible control method based on distributed multi-bus access energy storage, relates to a grid-connected control system of a power grid, and solves the technical problem that when the load of the power grid is small, the power generated by an energy storage system is reversely transmitted to the power grid to easily cause overload of the power grid or countercurrent flow of electric energy. The method comprises an anti-countercurrent strategy step, an anti-overload strategy step and a system operation step. The anti-countercurrent strategy step is used for determining charging power and discharging power issued to each distributed energy storage system; the anti-overload strategy step is used for determining a total charging power limit value and a total discharging power limit value which need to be issued to all distributed energy storage systems; the system operation step is used for analyzing and judging which one of an anti-countercurrent strategy and an anti-overload strategy of the energy storage system operates, so that the anti-countercurrent function and the anti-overload function can be met at the same time. According to the invention, self-adaptive flexible control and dynamic power adjustment of the energy storage system are realized, and the problems of overload of an access bus and reverse transmission of discharge current to a power grid can be avoided.

Description

Technical field [0001] The present invention relates to a grid grid control system, and more particularly, it relates to a distributed multi-master access storage energy adaptive flexibility control method. Background technique [0002] In recent years, with the decline in the cost of lithium-ion battery, the energy storage market has gradually increased. The data of various research institutions, and the cost of energy storage has been declining since 2010. 2010 ~ 2017 lithium-ion battery prices fell nearly 80%. Although the price of different technologies is different, the price drop rate of various types of batteries is substantially the same. According to Bnef data, the average price of the global lithium-ion battery group has dropped 87% compared to $ 156 / kWh in 2010, and the average price of China's lithium-ion battery group was a minimum of $ 147 / kWh. [0003] With the economic development, the power difference between electric power and electricity in the region is in...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an adaptive flexible control method based on distributed multi-bus access energy storage, which solves the problem of reversing the power generated by the energy storage system when the grid load is small. Sending to the grid is likely to cause grid overload or reverse flow of electricity

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