Microgrid energy storage configuration method considering schedulability of microgrid system

Abstract

The invention provides a microgrid energy storage configuration method considering the schedulability of a microgrid system. According to the method, the schedulability of the microgrid is modeled with entropies; based on a double-layer optimization model, a battery energy storage capacity optimization configuration model considering a schedulability constraint is put forwards; and the optimization configuration model is solved, and a microgrid energy storage configuration scheme considering the schedulability of the microgrid is obtained. Compared with an existing power prediction error probability distribution-based energy storage configuration method, the optimization model provided by the invention additionally considers the schedulability constraint of the microgrid, optimizes the rated power and rated capacity of energy storage, and effectively considers the influence of operating state quantities such as energy storage state of charge and cumulative life loss on the operation and energy storage configuration of the microgrid; and the configuration result of the method is beneficial to the realization of the user-friendly access of the microgrid to an external power grid.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a microgrid energy storage configuration method considering the dispatchability of the microgrid system. Background technique [0002] The uncertainty of renewable energy in the microgrid increases the difficulty of dispatching and controlling the microgrid by the external grid. Dispatchability is an important requirement for improving the friendliness of the microgrid to the external grid in view of the uncertain characteristics of the microgrid. The exchange power of the tie line between the microgrid and the external grid needs to have strong controllability, which can reduce the unplanned power exchange of the tie line, so as to realize the friendly access of the microgrid to the external grid. [0003] Energy storage capacity allocation is an important part of microgrid planning and construction. As an important energy buffer device in the microgrid, energy storage play...

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Problems solved by technology

[0005] The energy storage configuration method based on the probability distribution of power prediction error has the following problems: 1) The power prediction error of renewable energy is directly regarded as the energy storage power, and the influence of the operating state variables such as the state of charge on the operation of the energy storage is not considered. The state of charge is The key indicators considered in the operation of energy storage, and the operation of energy storage directly determines the effect of energy storage in reducing the uncertainty of renewable energy; 2) This method first configures the rated power of energy storage, and then configures the rated capacity of energy storage, But in fact, in the energy storage planning problem, there is a coupling between the rated power and the rated capacity of the energy storage, and the relevant operating status information such as the state of charge and the cumulative life loss of the energy storage cannot be obtained only by the rated power of the energy storage. 3) Energy storage configurations with different confidence levels are quite different, how to choose the confidence level has not yet been discussed

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