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Microgrid energy storage configuration method considering schedulability of microgrid system

A configuration method and dispatchable technology, applied in the power grid field, can solve the problems of large differences in energy storage configuration, influence of energy storage configuration, and inability to obtain accumulated life loss operation status information.

Active Publication Date: 2018-12-07
广州穗华能源科技有限公司
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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

Method used

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  • Microgrid energy storage configuration method considering schedulability of microgrid system
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  • Microgrid energy storage configuration method considering schedulability of microgrid system

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Embodiment Construction

[0070] The technical solution of the present invention will be described in detail below in conjunction with the drawings.

[0071] The microgrid energy storage configuration method considering the schedulability of the microgrid system in this embodiment includes steps:

[0072] 1) Entropy-based microgrid schedulability modeling: Assumption ΔP 0 is a sufficiently small interval length, P 0 is any constant, the interval sequence I is: I={D i |D i =[P i ,P i+1 ),ΔP 0 =P i+1 -P i ,i∈Z} (1)

[0073] The power entropy value of the tie line in a scheduling period h is:

[0074] p i,h Indicates that the power of the tie line in the scheduling period h falls in the interval D i The probability of , K is a constant coefficient;

[0075] 2) Modeling of battery energy storage life model: The life expression of battery energy storage is:

[0076] E. acc is the accumulative transfer energy of battery energy storage, N is the rated cycle times of battery energy storage, E...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/38G06Q10/06G06Q50/06
CPCG06Q10/06313G06Q50/06H02J3/383H02J3/386H02J3/32H02J2203/20Y02E10/56Y02E10/76Y02E40/70Y04S10/50
Inventor 苏忠阳李立浧蔡泽祥肖庆华林多楹魏长春王清海孙红日
Owner 广州穗华能源科技有限公司
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