A distributed energy storage aggregation control method for distribution network considering SOC balance

Abstract

The invention provides a power distribution network distributed energy storage aggregation control method considering SOC balance. A complete distributed control method of one-way communication modeling is adopted, so all stored energy can be communicated to complete a total control instruction, and SOC is kept relatively balanced in the charging and discharging process. The method is characterized in that small-power and small-capacity stored energy distributed dispersedly in the power distribution network can be aggregated into large-power and large-capacity equivalent centralized stored energy which is to be dispatched by a control center. The SOC of each distributed energy storage is kept relatively balanced in the charging and discharging process, a problem that partial stored energycannot be charged and discharged due to the fact that SOC reaches upper and lower limits in some time periods is prevented, so only part of the energy storage responds to superior charging and discharging power instructions.

Description

technical field [0001] The present invention relates to the technical field of distributed energy storage control, and more specifically, relates to a distribution network distributed energy storage aggregation control method considering SOC balance. Background technique [0002] In recent years, a large number of distributed power sources have been connected to the distribution network, and the randomness of their output has brought new problems to the operation of the distribution network. At the same time, with the rapid growth of load, the peak-to-valley difference continues to increase, and the problems of "low standards, weak connections, and low voltage" in urban and rural distribution networks have become increasingly prominent. Compared with traditional energy storage, it reduces the line loss and investment pressure of centralized energy storage power stations, and becomes an effective means to solve the above distribution network problems. [0003] There are thre...

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Problems solved by technology

[0004] The distributed control method of distributed energy storage in the existing distribution network only considers equal power proportional distribution and economic optimal distribution, and does not consider the SOC balance between distributed energy storage, which will lead to partial energy storage due to Its SOC reaches the upper and lower limits and cannot be charged and discharged

[0005] The communication condition of the distributed control method of the existing distributed energy storage in the distribution network is that the equipment must carry out two-way communication, and the problem of one-way communication between equipment cannot be dealt with.

[0006] The distributed control method of the existing distributed energy storage in the distribution network needs to detect the sum information of the actual charge and discharge power of each energy storage, and use the difference between the total charge and discharge command and its difference as the power iteration error item of the dominant node, which has not yet been fully realized. distributed control of

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