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Stabilization method of DC (direct current) microgrid system containing multiple parallel DC-DC converters

A DC microgrid and DC-DC technology, which is applied in the direction of DC network circuit devices, AC network circuits, and DC power supplies in parallel operation, can solve problems such as ignoring the dynamic performance of DC-DC converters

Inactive Publication Date: 2017-09-26
CENT SOUTH UNIV
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Problems solved by technology

But this model only works in droop mode, ignoring the dynamic performance of DC-DC converter

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  • Stabilization method of DC (direct current) microgrid system containing multiple parallel DC-DC converters

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[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0052] figure 1 It is a schematic flowchart of a method for stabilizing a DC microgrid system including multiple parallel DC-DC converters provided according to an embodiment of the present invention, as shown in figure 1 As shown, the embodiment of the present invention provides a method for stabilizing a DC microgrid system including multiple parallel DC-DC converter...

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Abstract

The invention provides a stabilization method of a DC (direct current) microgrid system containing multiple parallel DC-DC converters. Firstly, modelling is performed on the DC microgrid system containing the multiple parallel DC-DC converters; because the system is not stable, the stabilization method in the mode of a constant voltage source is proposed. By means of design of duty cycle of the system, the system is stabilized on the premise that system voltage is not decreased; a Jacobian matrix is acquired according to a node voltage and current equation, partial derivative of current for voltage and a circuit structure equation of the system, a characteristic polynomial is solved out, the range of influence on system parameters is solved out according to the Sylvester's inertia law and the Rayleigh's minimax principle, and finally, the stability domain of the system is determined. Compared with a method requiring feedback of a message of CPLs communication in the prior art, the method has the advantage that the cost is saved; besides, the stability of the DC microgrid system containing the multiple parallel DC-DC converters is improved.

Description

technical field [0001] The invention relates to the technical field of converter control, in particular to a method for stabilizing a DC microgrid system including multiple parallel DC-DC converters. Background technique [0002] In recent years, DC microgrid has attracted more and more attention. Compared with AC microgrid, its outstanding advantages are: high efficiency, easy control, and strong robustness. These advantages make the power generation system of distributed multi-DC DC-DC converters more and more used in aircraft, spacecraft and electric vehicles. In DC microgrids, distributed generation (DGs) are usually connected to the DC bus through DC-DC converters, and loaded with various loads. [0003] However, when CPLs participate, it may lead to system instability. To solve this problem, many researchers have carried out modeling, stability analysis and control strategy research. Among them, the studies done can be mainly divided into three categories: single co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
CPCH02J1/102H02J2203/20
Inventor 粟梅柳张杰韩华孙尧侯小超
Owner CENT SOUTH UNIV
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