DC micro-grid steady-state performance analysis method based on energy storage system

A DC micro-grid and energy storage system technology, applied in the direction of DC network circuit devices, collectors, electric vehicles, etc., can solve problems affecting work performance, high cost, high cost, etc., and achieve easy-to-implement, convenient and practical negative impedance characteristics , Eliminate the effect of negative impedance characteristics

Active Publication Date: 2017-09-22
北京汇思慧能科技有限公司
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Problems solved by technology

The former method will affect the normal working performance of the load, and the latter method needs to change the system hardware structure, which is too expensive for the existing equipment
[0004] Therefore, in the process of implementing the present application, the app...

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  • DC micro-grid steady-state performance analysis method based on energy storage system
  • DC micro-grid steady-state performance analysis method based on energy storage system
  • DC micro-grid steady-state performance analysis method based on energy storage system

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Embodiment Construction

[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0057] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0058]Aiming at the problems existing in the current common methods of eliminating the negative impedance characteristics of constant power loads, the inventors of the present application found that, in fact, the battery energy storage system connected in parallel with...

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Abstract

The invention discloses a DC micro-grid steady-state performance analysis method based on an energy storage system. The method comprises the following steps: respectively establishing a mixed-potential function model under a charging mode and a mixed-potential function model under a discharging model in a DC micro-grid system based on the characteristics of the DC micro-grid system in isolated island operation; respectively performing steady-state performance analysis based on the constructed mixed-potential function model and the stability theorem to obtain the stability conditions of the energy system under the charging mode and the discharging mode; regulating the parameter setting of the energy storage system according to the obtained stability conditions, and the controlling the stable operation of the DC micro-grid system. The DC micro-grid steady-state performance analysis method based on the energy storage system not only can conveniently and practically realize the elimination of the negative impedance characteristic of the constant power load, but also cannot cause the extra cost; and the realization is easy.

Description

technical field [0001] The present invention relates to the related technical field of DC micro-grid operating in an isolated island, in particular to a method for analyzing the steady-state performance of a DC micro-grid based on an energy storage system. Background technique [0002] In a DC microgrid system, refer to figure 1 As shown, it is a parallel dendritic DC microgrid topology. It can be seen from the figure that most of the loads are connected to the DC bus through a power electronic converter, that is, a load converter. When the load converter is under closed-loop control, the load and the load converter as a whole present a constant power load (Constant power loads, CPLs), when the bus voltage disturbance occurs in the DC microgrid system operating in an island, if the design is improper, the negative impedance characteristic presented by the constant power load is equivalent to introducing a positive feedback to the system, continuously amplifying the disturba...

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Application Information

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IPC IPC(8): H02J1/00H02J7/34
Inventor 刘欣博边亚伟
Owner 北京汇思慧能科技有限公司
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